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change directory into '//'

Please see sample output. Show Sample Output
This is sample output - yours may be different.
```
$ cd /
$ pwd
/
$ cd //
$ pwd
//             <= is not '/'
$ cd ///
$ pwd
/
$
```
-5

cd //

wbx · 2009-02-08 06:51:57 13
get line#1000 from text.
This is sample output - yours may be different.
-2

head -1000 < lines.txt | tail -1

wbx · 2009-02-08 06:41:20 15
backup directory. (for bash)
This is sample output - yours may be different.
3

cp -pr directory-you-want-to-backup{,_`date +%Y%m%d`} # for bash

wbx · 2009-02-08 06:37:40 12
backup file. (for bash)
This is sample output - yours may be different.
-1

cp -p file-you-want-backup{,_`date +%Y%m%d`} # for bash

wbx · 2009-02-08 06:34:46 9
watch filesizes (c.f. logfiles, file downloading, etc.)
This is sample output - yours may be different.
-2

while [ 1 ]; do date; ls -l /path/to/dir; sleep 1; done

wbx · 2009-02-08 06:25:50 184
Sort IP addresses

Sort IP address by order
This is sample output - yours may be different.
2

sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 /file/of/ip/addresses

SteamedFish · 2009-02-08 05:24:08 10
Better recursive grep with pretty colors... requires ruby and gems (run: "gem install rak")
This is sample output - yours may be different.
2

rak "what you're searching for" dir/path

manalang · 2009-02-08 05:08:09 12
Change size of lots of image files. File names are read from a text file.

Imagemagick library is used. If image format is not JPEG, the "quality" option should not be issued.
This is sample output - yours may be different.
-1

( while read File; do mogrify -resize 1024 -quality 96 $File; done ) < filelist

Corsair · 2009-02-08 02:48:26 11
Change size of lots of image files.

Imagemagick library is used.
This is sample output - yours may be different.
1

for File in *.jpg; do mogrify -resize 1024 -quality 96 $File; done

Corsair · 2009-02-08 02:43:11 11
List shared libraries recognized by the system

Allows to check if shared library could be dynamically loaded
This is sample output - yours may be different.
0

ldconfig -p | grep <somenewlib.so>

al3x · 2009-02-07 23:15:38 12
Check executable shared library usage

provides list of shared libraries required by executable Show Sample Output
This is sample output - yours may be different.
```
# ldd /bin/bash
        linux-gate.so.1 =>  (0x00ba2000)
        libtermcap.so.2 => /lib/libtermcap.so.2 (0x00484000)
        libdl.so.2 => /lib/libdl.so.2 (0x003c5000)
        libc.so.6 => /lib/libc.so.6 (0x00280000)
        /lib/ld-linux.so.2 (0x0025d000)
```
2

ldd <executable binary>

al3x · 2009-02-07 23:13:40 9
check rpm pkg content w/o installation

allows to check inside rpm file w/o installing it
This is sample output - yours may be different.
0

rpm -qlp <package.rpm>

al3x · 2009-02-07 23:11:59 10
list file descriptors opened by a process

Useful for examining hostile processes (backdoors,proxies)
This is sample output - yours may be different.
1

ls -al /proc/<PID>/fd

al3x · 2009-02-07 22:57:03 10
Flush DNS cache on OS X 10.5 Leopard
This is sample output - yours may be different.
0

dscacheutil -flushcache

epall · 2009-02-07 22:46:03 10
Fast searh Ubntu software repo
This is sample output - yours may be different.
-2

alias acs='apt-cache search'

hide1713 · 2009-02-07 22:08:44 11
Fast install software in Ubuntu
This is sample output - yours may be different.
-5

alias agi='sudo apt-get install'

hide1713 · 2009-02-07 22:07:16 10
Switch on eeepc camera

In some applications on eeepc xandros 7, default OS, video ccamera is not available untill you enter this command
This is sample output - yours may be different.
0

sudo echo 1 > /proc/acpi/asus/camera

orie · 2009-02-07 21:57:01 21
grep selectively

allows to grep very narrow subset of files
This is sample output - yours may be different.
0

find /path -name \*.php -user nobody -exec grep -nH whatever {} \;

al3x · 2009-02-07 20:53:56 9
fix broken permissions
This is sample output - yours may be different.
4

find /path -type d -perm 777 -exec chmod 755 {} \;

al3x · 2009-02-07 20:51:06 12
find out about a process

Good to find out about hostile processes Show Sample Output
This is sample output - yours may be different.
```
USER=rootLOGNAME=rootHOME=/rootPATH=/usr/bin:/bin:/usr/sbin:/sbinMAIL=/var/mail/rootSHELL=/bin/bashSSH_CLIENT=192.168.8.2 29998 22SSH_CONNECTION=192.168.8.2 29998 192.168.8.12 22SSH_TTY=/dev/pts/0TERM=linuxSSH_AUTH_SOCK=/tmp/ssh-IJZxdX8645/
```
0

cat /proc/<PID>/environ

al3x · 2009-02-07 20:49:19 11
color grep with specification of colors with GREP_COLOR env variable
This is sample output - yours may be different.
-2

setenv GREP_COLOR '1;37;41'

mnikhil · 2009-02-07 18:56:23 10
reset the bizzarre gone junk terminal to normal
This is sample output - yours may be different.
-2

echo "Xc" | tr "Xo" "\033\017

mnikhil · 2009-02-07 18:55:27 9
Use color grep by default

Alias the grep command to show colored results by default.
This is sample output - yours may be different.
1

alias grep 'gnu grep -i --color=auto'

mnikhil · 2009-02-07 18:54:56 9
show all programs connected or listening on a network port

Use the aliased command 'nsl'
This is sample output - yours may be different.
3

alias nsl 'netstat -f inet | grep -v CLOSE_WAIT | cut -c-6,21-94 | tail +2'

mnikhil · 2009-02-07 18:54:12 10
finding cr-lf files aka dos files with ^M characters

its useful to run dos2unix command later on them.
This is sample output - yours may be different.
1

find $(pwd) -type f -exec grep -l "$(echo "\r")" {} \;

mnikhil · 2009-02-07 18:53:00 15
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Add the time to BASH prompt

Adds the time in 12hr AM/PM format to the beginning of a prompt. Change \@ to \t for 24-hour time or \T for 12hr without AM/PM. To keep the time the next time you open a terminal, edit ~/.bashrc and stick the command at the bottom.

Create a Multi-Part Archive Without Proprietary Junkware

Leave it to a proprietary software vendor to turn a cheap and easy parlor trick into a selling point. "Hey guys, why don't we turn our _collection of multiple files_ into a *collection of multiple files*!!" Extract the ^above with this: $ cat pics.tar.gz.??? | tar xzv ^extract on any Unix - no need to install junkware! (If you must make proprietary software, at least make it do something *new*) if [ -e windows ]; then use 7-Zip

Insert a comment on command line for reminder

Comments can be used directly on the command line so I can save in the history a brief description of what command does.

convert a line to a space

Display EPOCH time in human readable format using AWK.

Schedule a script or command in x num hours, silently run in the background even if logged out

doesn't require "at", change the "2h" to whatever you want... (deafult unit for sleep is seconds)

Reinstall a Synology NAS without loosing any data from commandline.

Seen many questions how-to reinstall synology nas dsm without loosing data, here you go. Wait for a few min and then head over to http://nasip and setup your fresh installed nas.

List only locally modified files with CVS

Show all listening and established ports TCP and UDP together with the PID of the associated process

Easy to remenber. Fot TCP only use: netstat -plant

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

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