Some useless help
----------------------------------------------------------------------------------
per fetchmail visto che non risponde a locahost mettere in /etc/mail/local-host-names
e un make nella dir /etc/mail/
# local-host-names - include all aliases for your machine here.
localhost
nomehost
nomehost.dominio.it
127.0.0.1
dopo di che in .fetchmailrc
poll imap.server protocol imap username "username" password "xxxxxxxx" fetchall flush ssl is locausername smtphost 127.0.0.1
----------------------------------------------------------------------------------
Per xscreensaver e agente ssh
#!/bin/bash
export TEST="The screensaver is active"
export BLANK=0
while [ 0 -lt 10 ]; do
export SCREENLOCK=$(gnome-screensaver-command -q)
if [ "$SCREENLOCK" = "$TEST" ]; then
if [ $BLANK -eq 0 ]; then
ssh-add -D
BLANK=1
fi
else
if [ $BLANK -eq 1 ]; then
ssh-add < /dev/null
BLANK=0
fi
fi
sleep 10
done
semplice script che chiaramente deve essere migliorata e sistemata.
----------------------------------------------------------------------------------
per far eseguire firefox sempre da remoto dopo un ssh
122 export MOZ_NO_REMOTE=1
123 alias firefox='firefox -P'
----------------------------------------------------------------------------------
rpm duplicati
rpm -qa --qf '%{name}\n'| sort | uniq -d
per avere la lista
----------------------------------------------------------------------------------
iptab
----------------------------------------------------------------------------------
google search for a web cam:
inurl:/view/index.shtml
----------------------------------------------------------------------------------
estrai la lista dei common
grep "COMMON" * | grep -v "C\*\*" | awk '{print $2, $3}' | sort -k 2 | uniq -c
----------------------------------------------------------------------------------
FlashPlayer x86_64
pacchetto .tar.gz flashplayer:
http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash
nspluginwrapper (per fedore src.rpm rpmbuild --rebuild nspluginwrapper-0.9.91.5-1.src.rpm)
Copiamo i file libflashplayer.so flashplayer.xpt nella dir dove risiedono tutti
i plugin di mozilla/firefox: /usr/lib64/mozilla/plugins/
dare il comando:
# /usr/lib/nspluginwrapper/x86_64/linux/npconfig -i /usr/lib64/mozilla/plugins/libflashplayer.so
----------------------------------------------------------------------------------
Java Runtime Environment 1.4.2 (Blackdown)
Version: 1.4.2_03
SeaMonkey 1.1a, Firefox 2.0: Works Well
FAQ: Java FAQ
1. Download Blackdown JRE
2. Open a terminal, and change to the directory where you wish to install the JRE (eg. /usr/java)
3. Run the Blackdown JRE package executable. This will extract the JRE in the current directory.
4. Run the following command: ln -s ./j2re1.4.2/plugin/amd64/mozilla/libjavaplugin_oji.so ~/.mozilla/plugins/libjavaplugin_oji.so
Important! It is critical that you create a symbolic link to the Java plugin rather than copying it. If you copy it, your browser will crash whenever you load a page that has a Java applet.
Download Blackdown JRE 1.4.x
As for the java plugin problem. There is only one native 64bit java plugin available and it's the Gnu Java compiler one.
Make soft link from the file
/usr/lib64/gcj-4.1.1/libgcjwebplugin.so to /usr/lib64/mozilla/plugins/libgcjwebplugin.so
It's only 1.4.2, but it works very well.
----------------------------------------------------------------------------------
#include
int main () {
if (index > 0) {
std::cout << "Here" << std::endl;
}
if (strcat > 0) {
std::cout << "Here" << std::endl;
}
return 0;
}
compile it ....
$ g++ -W -Wall -o main main.cpp
$ ./main
Here
Here
mhmhmhmh ....
$ man index
----------------------------------------------------------------------------------
tar cf - ./$name | ssh root@backupsystem.it "cd /home; tar xvpf -"
----------------------------------------------------------------------------------
#!/bin/bash
for name in `ls *.jpg | sed 's/.jpg//'`
do
convert -resize 500 $name.jpg $name\_r.jpg
echo "![](\""$name\_r.jpg"\") | "
done
----------------------------------------------------------------------------------
a dcopy mkl debug:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000695e75 in Steps1_X8_Y16_Loop32 ()
(gdb) disassemble
Dump of assembler code for function Steps1_X8_Y16_Loop32:
0x0000000000695e40 : cmp $0x20,%rdi
0x0000000000695e44 : jl 0x695f70
0x0000000000695e4a : movaps 0x0(%rsi),%xmm1
0x0000000000695e4e : movaps 0x10(%rsi),%xmm2
0x0000000000695e52 : movaps 0x20(%rsi),%xmm3
0x0000000000695e56 : movaps 0x30(%rsi),%xmm4
0x0000000000695e5a : movaps 0x40(%rsi),%xmm5
0x0000000000695e5e : movaps 0x50(%rsi),%xmm6
0x0000000000695e62 : movaps 0x60(%rsi),%xmm7
0x0000000000695e66 : movaps 0x70(%rsi),%xmm8
0x0000000000695e6b : shufpd $0x1,%xmm1,%xmm0
0x0000000000695e70 : shufpd $0x1,%xmm2,%xmm1
0x0000000000695e75 : movaps %xmm0,0x0(%rcx)
0x0000000000695e79 : movaps %xmm1,0x10(%rcx)
...
(gdb) p/x $rcx
$3 = 0xa39fec
(gdb) x 0xa39fec
0xa39fec : 0x00000000
(gdb) x/8f 0xa39fec
0xa39fec : 0 0 0 0
0xa39ffc : 0 0 0 0
riferimento a struttura dati f90 interna, l'indirizzo direi e' valido visto il risultato
dei due x. Googling a bit about movaps, many nice stuff comes out.
movaps xmm, [mem|reg] = copy a 4-element vector (of 32-bit floats, for
a total of 128 bits) from memory to an xmm vector register. the "a" in
movaps means that alignment (on a 128-bit boundary) is required, there's
also an unaligned load.
SSE extensions
for example: http://www.bailopan.net/blog/?p=7
----------------------------------------------------------------------------------
program test
implicit none
integer :: maxorb
parameter(maxorb=1024)
type :: t4_type
integer :: firstint
integer :: occ(maxorb)
end type t4_type
type :: t4_type_2
integer :: firstint, secondint
integer :: occ(maxorb)
end type t4_type_2
integer norb, i, occi(maxorb)
type (t4_type) :: t4
type (t4_type_2) :: t42
real*8 :: pop(maxorb)
do i=1,maxorb
pop(i) = i
t4%occ(i) = 0
enddo
norb = 250
call testa (norb,pop,occi)
print *, "first"
call testa (norb,pop,t42%occ)
print *, "second"
call testa (norb,pop,t4%occ)
print *, "third"
end
subroutine testa (norb,pop,occ)
implicit none
integer norb
real*8 pop(1), occ
call dcopy(norb,pop,1,occ,1)
return
end
$ ifort -check all -r8 -o test main.F90 -L/opt/intel/mkl/lib/em64t -lmkl -lguide -lpthread
on a:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU 5160 @ 3.00GHz
stepping : 6
cpu MHz : 3000.114
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall lm pni monitor ds_cpl est tm2 cx16 xtpr
bogomips : 6004.35
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
$ ./test
first
second
forrtl: severe (174): SIGSEGV, segmentation fault occurred
Image PC Routine Line Source
libpthread.so.0 000000307930C430 Unknown Unknown Unknown
libmkl_mc.so 0000002A959B8CD5 Unknown Unknown Unknown
$ gdb ./test
GNU gdb Red Hat Linux (6.3.0.0-1.132.EL4rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/tls/libthread_db.so.1".
(gdb) r
Starting program: /home/redo/molecule/aug-cc-PVDZ/test/test
[Thread debugging using libthread_db enabled]
[New Thread 182897156448 (LWP 28485)]
first
second
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 182897156448 (LWP 28485)]
0x0000002a959b8cd5 in Steps1_X8_Y16_Loop32 () from /opt/intel/mkl/lib/em64t/libmkl_mc.so
(gdb) disassemble
Dump of assembler code for function Steps1_X8_Y16_Loop32:
0x0000002a959b8ca0 : cmp $0x20,%rdi
0x0000002a959b8ca4 : jl 0x2a959b8dd0
0x0000002a959b8caa : movaps 0x0(%rsi),%xmm1
0x0000002a959b8cae : movaps 0x10(%rsi),%xmm2
0x0000002a959b8cb2 : movaps 0x20(%rsi),%xmm3
0x0000002a959b8cb6 : movaps 0x30(%rsi),%xmm4
0x0000002a959b8cba : movaps 0x40(%rsi),%xmm5
0x0000002a959b8cbe : movaps 0x50(%rsi),%xmm6
0x0000002a959b8cc2 : movaps 0x60(%rsi),%xmm7
0x0000002a959b8cc6 : movaps 0x70(%rsi),%xmm8
0x0000002a959b8ccb : shufpd $0x1,%xmm1,%xmm0
0x0000002a959b8cd0 : shufpd $0x1,%xmm2,%xmm1
0x0000002a959b8cd5 : movaps %xmm0,0x0(%rcx)
...
(gdb) print $rcx
$1 = 5684076
(gdb) x/2g $rcx
0x56bb6c : 0x0000000000000000 0x0000000000000000
5684076 is not aligned on a 16-byte boundary.
(gdb) break *0x0000002a959b8cd0
Breakpoint 1 at 0x2a959b8cd0
(gdb) r
Starting program: /home/redo/molecule/aug-cc-PVDZ/test/test
[Thread debugging using libthread_db enabled]
[New Thread 182897156448 (LWP 28502)]
first
[Switching to Thread 182897156448 (LWP 28502)]
Breakpoint 1, 0x0000002a959b8cd0 in Steps1_X8_Y16_Loop32 () from /opt/intel/mkl/lib/em64t/libmkl_mc.so
no segfault
----------------------------------------------------------------------------------
encode some jpeg into an avi
mencoder "mf://*.jpg" -mf type=jpeg:fps=0.2 -o image-video.avi -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=300
----------------------------------------------------------------------------------
trainslate " " in "\n"
cat file | tr " " "\n" | grep "pdf"
----------------------------------------------------------------------------------
To use different .Xauthority when home in in a shared filesystem. To be used
for example with charmrun (./charmrun +p16 ++ssh-display ++debug
./diagonalizer_simple). In ~/.ssh/rc
#########################################################
# /etc/sshrc
# Set up the local file in which to store the .Xauthority information:
export XAUTHORITY=/tmp/.Xauthority.$USER
# Now create and write the magic cookie information:
if read proto cookie && [ -n "$DISPLAY" ]; then
if [ `echo $DISPLAY | cut -c1-10` = 'localhost:' ]; then
# X11UseLocalhost=yes
echo add unix:`echo $DISPLAY |
cut -c11-` $proto $cookie
else
# X11UseLocalhost=no
echo add $DISPLAY $proto $cookie
fi | /usr/X11R6/bin/xauth -q -
fi
#########################################################
in .bashrc
###########################################################
# ~/.bashrc X11 configuration
if [[ -z $DISPLAY ]]; then
# DISPLAY is not set, so check to see what X display is owned
# by the current user and set DISPLAY to this value:
X11_FOLDER=/tmp/.X11-unix
currentUser=`id -u`
bb=`ls -ln $X11_FOLDER | grep $currentUser`
bbb=${bb/*X/:}
usedDISPLAY=$bbb.0
export DISPLAY=$usedDISPLAY
else
# DISPLAY is set, so we assume remote user login via
# ssh and set the XAUTHORITY variable to point to
# proper file.
export XAUTHORITY=/tmp/.Xauthority.$USER
fi
###########################################################
----------------------------------------------------------------------------------
FC11
# yum install plymouth-system-theme
# plymouth-set-default-theme charge
# /usr/libexec/plymouth/plymouth-update-initrd
----------------------------------------------------------------------------------
dmidecode is a tool for dumping a computer’s DMI (some say SMBIOS) table contents in a human-readable format. This
table contains a description of the system’s hardware components, as well as other useful pieces of information
such as serial numbers and BIOS revision. Thanks to this table, you can retrieve this information without having
to probe for the actual hardware. While this is a good point in terms of report speed and safeness, this also
makes the presented information possibly unreliable.
dmidecode
----------------------------------------------------------------------------------
ONDA MT503HSA in Fedora 11
# cd ODTIM_Linux_UI/Alice_MOBILE/driver810
commenta riga onda.c:255
# make
# mv onda.ko /lib/modules/$(uname -r)/kernel/drivers/usb/serial
# depmod -a
# modprobe onda
in /etc/modprobe.d
# cat onda.conf
options usbserial vendor=0x19d2 product=0x0002
----------------------------------------------------------------------------------
citrix client:
in wfica.sh insert:
export LANG=C
----------------------------------------------------------------------------------
disable ssh service in gnome-keyring:
gconftool-2 --set -t bool /apps/gnome-keyring/daemon-components/ssh false
----------------------------------------------------------------------------------
tunnel ssh. Volendo accedere as un client remoto dal server se il client non e'
raggiugibile direttamente, posso usare tunnel ssh:
dal client:
ssh -f -N -R 2333:localhost:22 server
dal server:
ssh -p 2333 localhost
accedo al client se esso ha un server ssh in ascolto sulla porta 22.
----------------------------------------------------------------------------------
crypt /tmp
# init 3
# umount /tmp
# cryptsetup luksFormat /dev/VolGroup00/LogVol00Tmp
# cryptsetup luksOpen /dev/VolGroup00/LogVol00Tmp cryptotmp
# cat /etc/crypttab
cryptotmp /dev/VolGroup00/LogVol00Tmp
# cat /etc/fstab
/dev/mapper/cryptotmp /tmp ext3 defaults 1 2
# mkfs.ext3 /dev/mapper/cryptotmp
# mount /dev/mapper/cryptotmp /tmp/
Crypt swap
# swapoff -a
# cat /etc/crypttab
cryptoswap /dev/VolGroup00/LogVol00Swap /dev/urandom cipher=aes-cbc-essiv:sha256,size=256,hash=sha256,swap
# cat /etc/fstab
/dev/mapper/cryptoswap swap swap defaults 0 0
# cryptsetup create cryptoswap /dev/VolGroup00/LogVol00Swap
Crypt var da live
dd if=//dev/VolGroup00/LogVol03Var of=var.ext3
cryptsetup luksFormat /dev/VolGroup00/LogVol02Var
cryptsetup luksOpen /dev/VolGroup00/LogVol02Var cryptovar
cat /etc/crypttab
cryptovar /dev/VolGroup00/LogVol02Var
cat /etc/fstab
/dev/mapper/cryptovar /var ext3 defaults 1 2
mkfs.ext3 /dev/mapper/cryptovar
mount -o loop var.ext3 /mnt/oldvar
mount /dev/mapper/cryptovar /mnt/var
cd oldvar
cp -arfdZ * /mnt/var
----------------------------------------------------------------------------------
#load device module
modprobe dm-mod
#scan id needed
vgscan
#change the volumes that exist to active
vgchange -ay
#mount the logical partition
----------------------------------------------------------------------------------
99 apt-get install gcc gcc-3.4 gcc-4.1 gcc-4.2 gcc-4.3
104 apt-get install make
113 apt-get install linux-source-2.6.26
149 apt-get install ncurses-dev
168 apt-get install linux-headers-2.6.26-2-amd64
Next we unpack the downloaded Kernel Source in /usr/src.
tar xjvf linux-source-2.6.26.tar.bz2
ln -s linux-source-2.6.26 linux
Before we can start the CUDA Driver Installation we must set our environment to use the right gcc version, so in my case:
export CC="gcc-4.1"
Now we are ready for the CUDA Driver.
sh cudadriver_2.3_linux_64_190.18.run
----------------------------------------------------------------------------------
a DOS/MAC to UNIX text file format converter
dos2unix
----------------------------------------------------------------------------------
user home with apache fedora 12
1. Edit /etc/httpd/conf/httpd.conf file.
‘UserDir disabled’ to ‘UserDir enabled ’.
Uncomment ‘UserDir public_html’ line.
Uncomment the whole ‘’ section until the ‘’.
2. permissions:
# chmod 711 ~
# chmod 755 -R ~/public_html/
3. selinux problem:
# setsebool -P httpd_enable_homedirs true
# chcon -R -t httpd_sys_content_t ~/public_html # It looks like it’s not necessary. See dgrift’s comments below.
----------------------------------------------------------------------------------
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so vgrabbj -d /dev/video0 -f grab.jpg
per motion su debian:
export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so
/usr/bin/motion
se usi la start script potrebbe non funzionare, run it as root
----------------------------------------------------------------------------------
ricerca per sottostrutture:
babel -s C1CCCCN1 -imol2 *.mol2 -osdf test.sdf
----------------------------------------------------------------------------------
recover deleted files:
photorec
----------------------------------------------------------------------------------
Ho avuto la sfortuna di mettere le mani su un nokia c3 00 , per dover impostare
account email e whatsApp ... dopo un po' si intuisce come sia necessario
impostare oltre la connessione intenet web gli stessi parametri (anzi un subset)
anche per accesso di sincronizzazione. Ad esempio Wind:
Impostazioni-> Configurazione -> Impostazioni Personali
a questo punto: opzioni -> Aggiungi e selezione Sincronizzazione
Nel caso wind il punto di accesso sara' intenet.wind
----------------------------------------------------------------------------------
For Loop File Names With Spaces
for loop uses $IFS variable to determine what the field separators are
IFS=$(echo -en "\n\b")
http://www.cyberciti.biz/tips/handling-filenames-with-spaces-in-bash.html
----------------------------------------------------------------------------------
EFI shell:
eamples:
mount blk1
blk1:
use cd and ls to navigate the dirs
http://software.intel.com/en-us/articles/efi-shells-and-scripting/
----------------------------------------------------------------------------------
backup a running VirtualBox VM machine, where vmname is the VM name, and user
is the user owing the virtual machine, after a backup /home where is the VDI and
the snapshot in my case:
su user -c "VBoxManage controlvm vmname savestate"
rsync --progress -av -l --ignore-errors --delete ./home /backup
su user -c "VBoxHeadless -startvm vmnamer &"
----------------------------------------------------------------------------------
Gaussian 09 compilation problem in IA64. While compiling g09 on a IA64
architecture I encountered a minor compilation problem. Line 2769 of bsd/mdutil.c
need to be fixed as follow:
f77_int wait_(ist) f77_int *ist; {pid_t wait(); return(wait((int *) ist)); }
need to check
----------------------------------------------------------------------------------
read Arduino serial output using python:
import serial
ser = serial.Serial('/dev/ttyACM0', 9600)
while 1:
print ser.readline()
----------------------------------------------------------------------------------
dump an image from motion :
#include
#include
#include
#include
#include
#include
#include
#include
#define IPADDR "127.0.0.1"
#define PORTBASE 8080
#define UPPERCAMERANUMBER 13
int
main (void)
{
int sockfd;
int len, n;
int result;
int jpglength;
FILE *fd, *out;
int cameranumber;
char garbage1[80] = "";
char garbage2[30] = "";
char chbuffer[40000] = "";
struct sockaddr_in address;
cameranumber = 1;
sockfd = socket (AF_INET, SOCK_STREAM, 0);
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr (IPADDR);
address.sin_port = htons (PORTBASE + cameranumber);
len = sizeof (address);
result = connect (sockfd, (struct sockaddr *) &address, len);
if (result == -1)
{
perror ("ERROR: Cannot connect to Motion");
return 1;
}
fd = fdopen (sockfd, "r");
if (fd == NULL)
{
perror ("ERROR: Cannot connect to Motion");
return 1;
}
while (strncmp (garbage1, "Content-Length:", 15) != 0)
fgets (garbage1, 70, fd);
sscanf (garbage1, "%s%d", garbage2, &jpglength);
fgets (garbage1, 70, fd);
fread (chbuffer, 1, jpglength, fd);
//fprintf (stdout, "HTTP/1.1 200 OK\n");
//fprintf (stdout, "Content-Type: image/jpeg\n\n");
out = fopen ("actual.jpeg", "w");
if (out == NULL)
{
perror ("oops: Cannot open out file");
return 1;
}
n = fwrite (chbuffer, 1, jpglength, out);
if (n != jpglength)
{
perror ("Error: Cannot write full jpeg");
return 1;
}
fclose (fd);
fclose (out);
close (sockfd);
return 0;
}
----------------------------------------------------------------------------------
g++ link_flags_if_needed -o exe objects -Wl,-Bstatic static_lib_list -Wl,-Bdynamic dinamic_lib_list
----------------------------------------------------------------------------------
Add eth0 iface with a specific MAC:
ip link add link p4p1 name eth0 MACADDR type macvlan
----------------------------------------------------------------------------------
resize a FS with LVM
# lvresize -L +XXG <path to fs device>
# resize2fs <path to fs device>
if you have non free space and a scratch FS:
# umount /scratch
# lvresize -L +XXG <path to fs scatch device>
# mkfs.ext4 <path to fs scatch device>
# mount /scratch
and after the first two command
----------------------------------------------------------------------------------
put zeros:
for a in object*.sdf; do na=$(echo $a | sed 's/object//g'); b=$(printf object%05d.sdf ${na%.sdf}); echo $b; mv $a $b ; done
----------------------------------------------------------------------------------
Remove a broken disk (LVM):
sdf is the new disk :
# pvcreate /dev/sdf
# vgextend gw_vg /dev/sdf
Move data (/dev/sdb old disk):
# pvmove /dev/sdb /dev/sdf
# vgreduce gw_vg /dev/sdb
----------------------------------------------------------------------------------
resize virtual disk size:
VBoxManage modifyhd YOUR_HARD_DISK.vdi --resize SIZE_IN_MB
----------------------------------------------------------------------------------
Plot p GTO orbital:
http://www.ccl.net/cca/documents/basis-sets/basis.html
gnuplot> f(x,y,z) = 2.7**(-0.4555*sqrt(x**2+y**2+z**2))*x
gnuplot> splot f(x,y,0), f(x,y,1), f(x,y,2), f(x,y,3)
http://shpenkov.janmax.com/HybridizationShpenkov.pdf
http://en.citizendium.org/wiki/Gaussian_type_orbitals
http://en.citizendium.org/wiki/Spherical_harmonic
----------------------------------------------------------------------------------
Resize fs on LVM:
umount /home/
e2fsck -f /dev/mapper/vg_bwmcc-lv_home
resize2fs /dev/mapper/vg_bwmcc-lv_home 1600G
lvreduce -L -100G /dev/mapper/vg_bwmcc-lv_home
lvcreate -l 100%FREE -n lv_local vg_bwmcc
mkfs.ext4 /dev/mapper/vg_bwmcc-lv_local
mount /dev/mapper/vg_bwmcc-lv_local /usr/local/
----------------------------------------------------------------------------------
peak performance (GFLOPS) for a single node:
GFLOPS = ( number_of_CPU ) * ( number_of_cores_per_CPU ) * GHz * MULTI
where MULTI is specific to the kind of CPU, that is floating point operations per cycle.
example, Intel Xeon E5-2600 (Sandy Bridge) series has MULTI = 8
----------------------------------------------------------------------------------
DC5 DF4EBBEEABA7
----------------------------------------------------------------------------------
Hidden Wiki
http://kpvz7ki2v5agwt35.onion/wiki/index.php/Main_Page
----------------------------------------------------------------------------------
Missed ftp password ?
# dsniff -i ethX
Password Sniffing with “dsniff” on the Local Network
----------------------------------------------------------------------------------
after a Ctrl-D reboot to modify root fs:
# mount -o remount,rw /
----------------------------------------------------------------------------------
Too many semaphores (DDI Process 0: semget return an error.
semget errno=ENOSPC -- check system limit for sysv semaphores.
DDI Process 0: error code 911
DDI Process 9: semget return an error.)
ipcs to list semaphores and all other IPC communication channels
after ipcrm to remove them.
ipcs -s | awk '{print $2}' | xargs
and after :
for id in ......
do
ipcrm -s $id
done
same with -m and so on....
----------------------------------------------------------------------------------
ReadyNAS netgear cannot obtain root access via NFS. Easy workaround , install ssh
access plugins and charge ownership diredtly using the readynas shell
(i.e. internally)
----------------------------------------------------------------------------------
private http proxy. Remote host with squid installed listening to loopback and
from the client run:
ssh -C2qTnN -L 8080:localhost:8080 remotehost
set proxy to 127.0.0.1:8080 in your browser
----------------------------------------------------------------------------------
Adding a mirror to an existing LVM volume
Purpose
Mirror a LVM volume, e.g. add a mirror to proxmox's root/swap/data so that locally created VMs are protected from disk failure.
Prerequisities 2 physical disks.
add second disk to the volume group containing the volumes you want to mirror:
pvcreate /dev/sdb1 # /dev/sdb1 is the physical disk to contain the mirrors
vgextend pve /dev/sdb1 # pve is volume group name you wish to extend
lvconvert -m 1 --corelog pve/data # -m 1 (how many mirrors to create) --corelog (keep the log in memory, requires a resync on reboot)
----------------------------------------------------------------------------------
mpirun --mca btl_tcp_if_exclude virbr0 -pernode --hostfile ./hostnames -n 2 ./mpitest
exclude virbr0 interface, so openmpi wont use the given interface
----------------------------------------------------------------------------------
MAC OSX
diskutil partitionDisk disk2 1 GPT HFS+ extdisk R
partition and add GPT ti a specific disk Mac osx
----------------------------------------------------------------------------------
ssh hang after :
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
solved using ssh -o MACs=hmac-md5 .... so adding Host :
Host nametobeused
Hostname real.name.host
MACs hmac-md5
to the .ssh/config file
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rename files with unusual characters (i.e. spaces );
find -name "* *" -type f | rename 's/ /_/g'
find -name "*(*" -type f | rename 's/\(//g'
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Extract audio track from MKV (OPUS) to mp3:
fot name in *.mkv
do
export filename=$(basename "$name")
export extension="${filename##*.}"
export base="${filename%.*}"
echo $base
export trackn=$(mkvinfo ${base}.mkv | grep "Track type" | grep -n "audio" | cut -d ":" -f1)
export audiotrackn=$(echo "${trackn} - 1" | bc)
echo "track number: " $audiotrackn
mkvextract tracks ${base}.mkv ${audiotrackn}:${base}.opus
opusdec ${base}.opus ${base}.wav
ffmpeg -i ${base}.wav ${base}.mp3
rm -f ${base}.opus ${base}.wav
done
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original post here: https://ubuntuforums.org/showthread.php?t=2291335&p=13341757#post13341757
not sure turn off windows fast start-up necessary
for sure not necessary disable Secure Boot in bios in my case
a lot of advice stress the importance of this
I try to recap my solving (for computer laptop acer E5-571-57H1)
(after installed xubuntu)
turn on and press F2, bios come up (mine called InsydeH20 setup utility rev. 5.0)
go to page Security
go to "Set Supervisor Password" press ENTER (I set pass "a")
go to "Select an UEFI file as trusted for executing:" press ENTER
a new page appear with listed:
HDD0
HDD0
press ENTER on the first HDD0 and see if a sub list with the name "" comes up (in my case did not show but: recycle bin and system volume info)
press ENTER on the second HDD0 and see if a sub list with comes up (in my case showed and )
press ENTER on , new list comes
press ENTER on, new list comes with:
shimx64.efi
grubx64.efi
MokManager.efi
press enter on each one and give them a for you recognizable name (I used "xubuntushimx64efi", "xubuntugrubx64efi", "xubuntuMokManagerefi")
and press Yes
save and exit
go back in bios f2
go to "Set Supervisor Password" and set pass to nill-blank (you want to eliminate a not necessary password that you could forget...)
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mount an LVM volumes stored in a file :
# losetup /dev/loop0 ./wserver.img
# fdisk -u -l /dev/loop0
Disk /dev/loop0: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0003ac18
Device Boot Start End Sectors Size Id Type
/dev/loop0p1 * 2048 1026047 1024000 500M 83 Linux
/dev/loop0p2 1026048 41943039 40916992 19.5G 8e Linux LVM
we are interested in the second molume so:
512 * 1026048 = 525336576 (thata is sector size * Start sector of Linux LVM)
# losetup -d /dev/loop0
and:
# losetup /dev/loop0 ./wserver.img -o 525336576
# fdisk -u -l /dev/loop0
Disk /dev/loop0: 19.5 GiB, 20949499904 bytes, 40916992 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
# lvm pvscan
PV /dev/loop0 VG vg_www-thch lvm2 [19.50 GiB / 0 free]
PV /dev/md126p2 VG fedora lvm2 [921.51 GiB / 0 free]
Total: 2 [941.01 GiB] / in use: 2 [941.01 GiB] / in no VG: 0 [0 ]
# lvm vgchange -ay
2 logical volume(s) in volume group "vg_www-thch" now active
# mount /dev/mapper/vg_www--thch-lv_root /mnt/ext
so the filesystem is now mounted in /mnt/ext
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run a remote X locally:
Xephyr -ac -screen 1280x1024 -br -reset -terminate -resizeable :1
export DISPLAY=:1
pekwm
and so on ...
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# see DNS
olvectl status | grep "DNS Server" -A2
# set DNS via CLI if NetworkManager is used
nmcli con
nmcli con mod "Wired connection 1" ipv4.dns "8.8.8.8 8.8.4.4"
nmcli con down "Wired connection 1" ; nmcli con up "Wired connection 1"
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![](\"./"$name.jpg"\")