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find largest file in /var

find largest file in /var
This is sample output - yours may be different.
4

find /var -mount -ls -xdev | /usr/bin/sort -nr +6 | more

mnikhil · 2009-05-16 10:53:55 6
Creating a ZFS Storage Pool by Using Files

This command creates an unmirrored pool using files. While not recommended, a pool based on files can be useful for experimental purposes.
This is sample output - yours may be different.
-2

zpool create tank /path/to/file/a /path/to/file/b

mnikhil · 2009-05-16 10:46:17 6
Creating a Mirrored Storage Pool using Zpool

command creates a pool with two mirrors, where each mirror contains two disks.
This is sample output - yours may be different.
-2

zpool create tank mirror c0t0d0 c0t1d0 mirror c0t2d0 c0t3d0

mnikhil · 2009-05-16 10:44:56 15
Creating a RAID-Z Storage Pool

The following command creates a pool with a single raidz root vdev that consists of six disks.
This is sample output - yours may be different.
-2

zpool create tank raidz c0t0d0 c0t1d0 c0t2d0 c0t3d0 c0t4d0 c0t5d0

mnikhil · 2009-05-16 10:44:05 4
Rip a DVD to AVI format

Substitute whatever track number you want into the "dvd://1" parameter. The "-aid 128" is to select the English language.
This is sample output - yours may be different.
2

mencoder dvd://1 -aid 128 -o track-1.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg4

dstahlke · 2009-05-16 00:08:57 4
How to Find the Block Size

Useful to know, especially if you are dealing with output configurations in block size. Tested on 'Red Hat'.
This is sample output - yours may be different.
0

/sbin/dumpe2fs /dev/hda2 | grep 'Block size'

rez0r · 2009-05-15 22:23:21 4
Updating the status on identi.ca using curl.

identica is an open source social networking and micro-blogging service. Based on Laconica, a micro-blogging software package built on the OpenMicroBlogging specification. http://identi.ca/
This is sample output - yours may be different.
4

curl -u USER:PASS -d status="NEW STATUS" http://identi.ca/api/statuses/update.xml

unixmonkey3754 · 2009-05-15 19:57:00 83
List all PostgreSQL databases. Useful when doing backups
This is sample output - yours may be different.
3

psql -U postgres -lAt | gawk -F\| '$1 !~ /^template/ && $1 !~ /^postgres/ && NF > 1 {print $1}'

lv4tech · 2009-05-15 14:33:50 6
Copy data using gtar

It copies the entire current working directory to the destination directory with compression enabled.
This is sample output - yours may be different.
1

gtar cpf - . | (cd /dest/directory; gtar xpf -)

mnikhil · 2009-05-15 13:23:00 8
Make a directory named with the current date

Create a directory named with the current date in ISO 8601 format (yyyy-mm-dd). Useful for storing backups by date. The --iso switch may only work with GNU date, can use format string argument for other date versions.
This is sample output - yours may be different.
3

mkdir `date --iso`

hal · 2009-05-15 12:30:10 8
Quickly assess quality of project by greping the SVN commit logs

A good way to understand what you've let yourself in for. Potential project metric could be the count: svn log | grep -c "bodge\|fudge\|hack\|dirty"
This is sample output - yours may be different.
-4

svn log | grep "bodge\|fudge\|hack\|dirty"

root · 2009-05-15 09:55:44 5
Dumping Audio stream from flv (using ffmpeg)
This is sample output - yours may be different.
8

ffmpeg -i <filename>.flv -vn <filename>.mp3

mohan43u · 2009-05-15 05:03:30 8
Dumping Audio stream from flv (using mplayer)
This is sample output - yours may be different.
4

$ mplayer -dumpaudio -dumpfile <filename>.mp3 <filename>.flv

mohan43u · 2009-05-15 04:44:20 4
Search for commands from the command line

Search at CommandLineFu.com from your terminal. Get the clfu-seach at http://www.colivre.coop.br/Aurium/CLFUSearch Show Sample Output
This is sample output - yours may be different.
```
Searching...

sed -n '10,20p' <filename>
Print all the lines between 10 and 20 of a file

sed '1000000!d;q' < massive-log-file.log
Efficiently print a line deep in a huge log file

sed 's/\o0/\n/g' /proc/INSERT_PID_HERE/environ
Given process ID print its environment variables
```
17

clfu-seach <search words>

aurium · 2009-05-14 19:54:45 91
automatically add and remove files in subversion

automatically add and remove files in subversion so that you don't have to do it through the annoying svn commands anymore
This is sample output - yours may be different.
0

svn st | grep '^\?' | awk '{print $2}' | xargs svn add; svn st | grep '^\!' | awk '{print $2}' | xargs svn rm

stedwick · 2009-05-14 14:34:50 7
Remove all .svn folders inside a folder
This is sample output - yours may be different.
-1

find . -name "\.svn" -exec rm -rf {} ";"

caiosba · 2009-05-14 12:02:25 9
Get your public ip using dyndns
This is sample output - yours may be different.
17

curl -s http://checkip.dyndns.org/ | grep -o "[[:digit:].]\+"

lv4tech · 2009-05-14 09:43:31 13
Mac Sleep Timer

Schedule your Mac to sleep at any future time. Also wake, poweron, shutdown, wakeorpoweron. Or repeating with sudo pmset repeat wakeorpoweron MTWRFSU 7:00:00 Query with pmset -g sched Lots more at http://www.macenterprise.org/articles/powermanagementandschedulingviathecommandline
This is sample output - yours may be different.
4

sudo pmset schedule sleep "08/31/2009 00:00:00"

hobzcalvin · 2009-05-14 09:31:32 17
alt + 1 .

alt + number + dot will insert last command argument at $number place, alt + 0 + . will print last command name. For example ls /tmp /var ls /usr /home alt + 1 + . will result in '/usr' , if you press alt + . again, it will result in '/tmp' alt + 0 + . -> 'ls'
This is sample output - yours may be different.
10

alt + 1 .

elementa13 · 2009-05-14 09:14:01 8
alias for etckeeper, to commit changes after moification of etc

ec commits changes to etckeeper must have etckeeper installed with bzr to use this place inside bashrc can be used from any directory to commit changes
This is sample output - yours may be different.
0

function ec() { ec_var="`pwd`" && cd /etc/ && sudo bzr commit -m "$@" && cd $ec_var; }

professoralex · 2009-05-14 04:34:26 5
alias for lsof -i -T -n

list what applications using what ports Show Sample Output
This is sample output - yours may be different.
```
[sudo] password for digi: 
COMMAND     PID        USER   FD   TYPE  DEVICE SIZE NODE NAME
... (output varies)
```
-2

alias lso="sudo lsof -i -T -n"

professoralex · 2009-05-14 04:01:05 4
aliases for apt-get

these are some aliases you can use in bashrc to shorten the amount of typing needed to use apt-get, also can be used as reference if you can't remember alot of commands or command parameter variations,etc... Please comment with more apt-get aliases if I missed any, thx Show Sample Output
This is sample output - yours may be different.
```
#all apt-get aliases (add to .bashrc or type in cmdline):
$ alias agi='sudo apt-get install' #packages
$ alias agu='sudo apt-get update'
$ alias ags='sudo apt-cache search' #string-in-package-name-or-descr
$ alias agsh='sudo apt-cache show' #string
$ alias agr='sudo apt-get remove' #packages
$ alias agd='sudo apt-get dist-upgrade'
$ alias agc='sudo apt-get clean'
$ alias agac='sudo apt-get autoclean'
```
-4

alias agi="sudo apt-get install" #package_names

professoralex · 2009-05-14 03:31:47 8
Duplicating service runlevel configurations from one server to another.

And then to complete the task: Go to target host; ssh host Turn everything off: for i in `chkconfig --list | fgrep :on | awk '{print $1}'` ; do chkconfig --level 12345 $i off; done Create duplicate config: while read line; do chkconfig --level $line on; done < foo
This is sample output - yours may be different.
3

chkconfig --list | fgrep :on | sed -e 's/$^.*$*0:off/\1:/g' -e 's/$.$:on/\1/g' -e 's/.:off//g' | tr -d [:blank:] | awk -F: '{print$2,$1}' | ssh host 'cat > foo'

catawampus · 2009-05-13 21:17:39 11
alias source .bashrc and nano .bashrc

alias for editing .bashrc and sourcing it with a quick command, very useful for quickly adding and modifying alias' and functions in bashrc, create lots of alias from commandlinefu very quickly, use nano vim or any other edit if you want, very useful if you have a barcode scanner and you want to run commands quickly with barcodes Show Sample Output
This is sample output - yours may be different.
```
usage:
$ nbrc
edit .bashrc
press ctrl-x,y,enter
$ sbrc
```
-19

alias sbrc="source ~/.bashrc" && alias nbrc="nano ~/.bashrc"

professoralex · 2009-05-13 02:41:37 11
Syslog System Reporting in a shell
This is sample output - yours may be different.
0

tail -f --retry /var/log/syslog /var/log/auth.log | ccze -A

Yury · 2009-05-13 00:02:50 5
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What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Change proccess affinity.

Set the affinity of a process to a particular core(s). Arguments for processor include a comma separated list, or a range. (example: 1,2 or 0-3) You can use top in smp mode (Press 1) to see the changes to the affinity.

Print sensors data for your hardware

Generate 2000 images with its number written on it

Open a manpage in the default (graphical) web browser

An easy alias for opening a manpage, nicely HTML formatted, in your set internet browser. If you get a "command exited with status 3" error you need to install groff.

Rename files in batch

check open ports

Tested in Linux and OSX

Converts all pngs in a folder to webp using all available cores

As an alternative to the above command, this one ditches the unnecessary and complicated for loop in favor of a way faster multi-core approach for a task that's more CPU than I/O intensive, making it a perfect suite for GNU parallel

Find usb device in realtime

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

Function to check whether a regular file ends with a newline

tail -c 1 "$1" returns the last byte in the file. Command substitution deletes any trailing newlines, so if the file ended in a newline $(tail -c 1 "$1") is now empty, and the -z test succeeds. However, $a will also be empty for an empty file, so we add -s "$1" to check that the file has a size greater than zero. Finally, -f "$1" checks that the file is a regular file -- not a directory or a socket, etc.

Command line calculator

This function defines a command line calculator that handles everything pythons math module can handle, e.g. trigonometric functions, sqrt, log, erf, ... (see http://docs.python.org/library/math.html). It even knows about the constants pi and e.

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