Commands

man

man correct caracters.

LANG=C man passwd

man clean for output to file.

man [manual] | col -b > file.txt

putty

set up tunnel

putty -l bjorklun -pw password -L 19242:192.168.0.42:3389 blt.homeip.net

mbr

backup mbr.

# dd if=/dev/sdX of=/temp/sdx-mbr bs=512 count=1

restore mbr

# dd if=/temp/sdx-mbr of=/dev/sdX bs=446 count=1

numbers

series of numbers

bash:
echo {1..10}

rpm

install src.rpm

rpmbuild --rebuild alien-6.51-1.src.rpm
rpm -i /usr/src/redhat/RPMS/x86_64/alien-6.51-1.rpm

List contents of rpm.

rpm -qlp myfile.rpm

Extract contents of rpm.

rpm2cpio *.rpm | cpio -i --make-directories

Which version of rpm is installed. /etc/rpm/macros

%_query_all_fmt         %%{name}-%%{version}-%%{release}.%%{arch}

Extract rpms in subdirectories.

for RPM in $(ls *|sed 's_\.rpm$__g');do echo $RPM; mkdir $RPM; rpm2cpio $RPM.rpm | (cd $RPM && cpio -i --make-directories);done

clean

Clean file from comments and blank lines.

sed '/ *#/d; /^ *$/d'

Update release area Windows.

servicepack.exe -s:z:\w2k3

rsync

Syncronize folders.

rsync --delete -az -e ssh acrobatreader acdse office2003 java nortonantivirus bjorklun@semco.homeip.net:/install/program/windows/

crontab

crontab.

* * * * *  command to be executed
- - - - -
| | | | |
| | | | +----- day of week (0 - 6) (Sunday=0)
| | | +------- month (1 - 12)
| | +--------- day of month (1 - 31)
| +----------- hour (0 - 23)
+------------- min (0 - 59)
0 Sunday
1 Monday
2 Tuesday
3 Wednesday
4 Thursday
5 Friday
6 Saturday 

ssh

Automated login on a user basis via ssh.

ssh-keygen -t dsa                    Generate personal ssh keys.
cat id_dsa.pub >> authorized_keys2   Copy your personal ssh key to all machines.
chmod 644 ~/.ssh/authorized_keys2    Verify correct access on files.

Tunnel ssh -nNTx -R 8728:localhost:8805 brscs20.brs.infineon.com > /dev/null 2>&1 -n Dont take console. Good for background. -N Do not execute a remote command -T Disable pseudo-tty allocation. -x Disables X11 forwarding. -R port:host:hostport

ssh -N -L 2222:www.halfface.se:22 www.halfface.se
ssh -nNTx -R 2222:www.halfface.se:22 www.halfface.se

forward traffic

service x11
{
        disable = no
        socket_type = stream
        protocol = tcp
        wait = no
        user = root
        server = /usr/bin/nc
        server_args = 172.28.37.152 6000
}

reboot

Hard reboot mean that shutdown scripts will not run and machine reboot immediately without syncing hard disk drives, shutdown applications etc.
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
This commands enable sysrq and after this call fast reboot. If you want to force shutdown machine try this.

Force shutdown

echo 1 > /proc/sys/kernel/sysrq 
echo o > /proc/sysrq-trigger

ffmpeg

ffmpeg -y -deinterlace -aspect 16:9 -author "Andreas Bjorklund" -title "Tanzania" -year 2007 -i Tanzania.m2t -acodec mp3 -vcodec mpeg4 -b 3000k -s 720x540 test.avi

logging

bash create log.

#!/bin/bash
exec > /logfile

alternative

exec 2>/tmp/log

Read logs on system.

tail -f $(lsof | grep log$ |awk '{ print $NF }' | sort -u |xargs)

rename

rename series.

for i in *; do mv "$i" "`basename $i .mpg`bajs.mpg"; done

rename series.

ls | sed 's/.*/mv & &.old/' | bash

ntfs-3g

mount ntfs filesystem. read and write.

yum install fuse fuse-libs ntfs-3g
mount /dev/sda1 /media/c_drive -t ntfs-3g -r -o umask=0222,locale=en_US
mount /dev/sda1 /media/c_drive -t ntfs-3g -rw -o umask=0000,locale=en_US
fstab read and write.
/dev/sda3   /media/e_drive     ntfs-3g    ro,defaults,umask=0222 0 0
/dev/sda1   /media/c_drive     ntfs-3g    rw,defaults,umask=0000 0 0

mplayer

mplayer in ascii mode.

mplayer -monitoraspect 4:3 -vo aa LinaFreestyler.avi

mplayer on second soundcard.

mplayer -ao oss:/dev/dsp *.mp3
mplayer -ao alsa:device=hw=0.0 *.mp3

Or, to specify a non-default (secondary) device either of the following commands can be used.

mplayer -ao oss:/dev/dsp1 *.mp3
mplayer -ao alsa:device=hw=1.0 *.mp3

play from v4l

mplayer -tv device=/dev/video:driver=v4l:input=1:width=640:height=480:norm=ntsc:adevice=/dev/dsp tv://1 -zoom -aspect 4:3

vi

:set ignorecase
:set list        show all keys.
:set nolist      show their representative.

codepage

Change codepage of file.

convmv -f cp850 -t iso-8859-1 --notest *
convmv -f utf8 -t iso8859-1 -r --notest *

keyboard

keymaps 
dumpkeys
loadkeys sv-latin1
setxkbmap en

reset corrupt keyboard after using vmware.

setxkbmap

date

date '+%Y-%m-%d %H:%M'
date +%Y-%m-%d-%H%M

# date 033121422003.55
Mon Mar 31 21:42:55 PST 2003
date MMDDhhmmCCYY.ss

# 
date --date="+1000 years" +%C%y-%m-%d
date --date="-2 hour" +%C%y-%m-%d\ %H:%M
TZ=CEST date --date="-2 hour" +%C%y-%m-%d\ %H:%M

touch

touch -am 0910120003    Give a new access time on a file 0910120003MMDDhhmmyy

linux

touch -t 197102162324 *

tcpdump

dump trafic information, -e Print the link-level header on each dump line, -vvv verbose.

tcpdump -e -vvv port 21

dhclient

[root@wall sysconfig]# cat /etc/dhclient.conf

interface "eth0" {
         prepend domain-name-servers 127.0.0.1;
         supersede domain-name "bltprojektering.se";
}

search&replace

perl

grep -rsl '10.6.4.102' * | xargs perl -pi -e 's/10.6.4.102/10.6.4.103/'

sed

find . -type f -exec sed -i 's/string1/string2/g' {} \;

Grep for regexp starting with CN= and stop at first occurrence of ,.

grep -oE 'CN=[^,]*,'

pulse audio

sudo /sbin/alsactl restore

What architecture does my cpu have

lshw -class processor

command line mail with attachment

mutt -a syslogs.tar.gz admin@domain.org < /dev/null

printscreen

import -window root test.png

diff

sdiff <(echo -e 'hej\nda\nvi\nses\ni\nmorgon') <(echo -e 'hej\ndå\nvi\nSES\ni\nmorgon')

xargs

locate -ir ".*\.crt$" | xargs -i -t cp {} /temp/ssl/

sort

Sort ip address.

sort -t. +0n -1 +1n -2 +2n -3 +3n -4 <ip.list > ip.list.sort

cut

Cuf everything from field 5.

cut -f5- -d ' '

disk usage

baobab

find

Find exluding directory.

find . -wholename '/var/' -prune -o -ls

Find in only files.

find /opt/ongame/ -type f -exec grep --color=always -r '10\.7\.' /dev/null {} \;

boot

Booting singe user mode.

kernel ... single

netcat

• Check communication.

listen on port 3333.

nc -l 3333

talk to port 3333.

nc 192.168.0.1 3333

• Transfer data.

Cat file, calculate size listen on port 3333.

cat backup.iso | pv -b | nc -l 3333

Receive file.

nc 192.168.0.1 3333 | pv -b > backup.iso

grep

Colorize grep output.

grep --color=always -r '10\.7\.' /opt/ongame/