Hide

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. 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.


If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.
Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

Hide

News

May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!
Hide

Top Tags

Hide

Functions

Hide

Credits

Commands by sharfah from sorted by
Terminal - Commands by sharfah - 46 results
count=0;while IFS= read -r -d '' line; do echo "${line#* }"; ((++count==5)) && break; done < <(find . -type f -printf '%s %p\0' | sort -znr)
2013-03-19 17:19:26
User: sharfah
Functions: echo find read sort
Tags: sort find head,
-4

This command is more robust because it handles spaces, newlines and control characters in filenames. It uses printf, not ls, to determine file size.

echo '#!'$(which bash) > script.sh
2012-02-06 08:25:27
User: sharfah
Functions: echo which
Tags: bash
-4

Writes out the shebang line (#!/bin/bash) to the script.

xpath () { xmllint --format --shell "$2" <<< "cat $1" | sed '/^\/ >/d' }
2011-12-20 08:34:11
User: sharfah
Functions: sed
Tags: xml xmllint xpath
-1

This function uses xmllint to evaluate xpaths.

Usage: xpath /path/to/element XMLfile

upper() { echo ${@^^}; }
lower() { echo ${@,,}; }
mailme(){ mailx -s "$@" $USER <<< "$@"; }
2011-10-07 08:55:47
User: sharfah
Functions: mailx
Tags: email mail mailx
2

Usage: mailme message

This is a useful function if you want to get notified about process completion or failure. e.g.

mailme "process X completed"
diffxml() { diff -wb <(xmllint --format "$1") <(xmllint --format "$2"); }
2011-10-06 07:36:13
User: sharfah
Functions: diff
Tags: diff xml xmllint
13

Diffs two xml files by formatting them first using xmllint and then invoking diff.

Usage: diffxml XMLFile1 XMLFile2

upto() { cd "${PWD/\/$@\/*//$@}" }
jd() { cd **/"$@"; }
2011-10-05 11:47:57
User: sharfah
Functions: cd
-3

Usage: jd dir

Requires globstar. To set globstar use:

shopt -s globstar
xpath () { xmllint --format --shell "$2" <<< "cat $1" | sed '/^\/ >/d' }
2011-10-05 07:45:16
User: sharfah
Functions: sed
0

This function uses xmllint to evaluate xpaths.

Usage: xpath /some/xpath XMLfile

TTY=$(tty | cut -c 6-);who | grep "$TTY " | awk '{print $6}' | tr -d '()'
echo sortmeplease | perl -pe 'chomp; $_ = join "", sort split //'
ps -ef | grep user | awk '{print $2}' | while read pid; do echo $pid ; pfiles $pid| grep portnum; done
2010-01-11 12:34:51
User: sharfah
Functions: awk echo grep ps read
0

My old Solaris server does not have lsof, so I have to use pfiles.

/usr/ucb/ps -auxgww
2009-12-28 12:36:04
User: sharfah
-2

Depending on your installation, when you run ps you will only get the first 40 or so characters displayed. In order to view the entire string, use /usr/ucb/ps on Solaris.

shopt -s dotglob
echo $X | egrep "^[0-9]+$"
find /proc -user myuser -maxdepth 1 -type d -mtime +7 -exec basename {} \; | xargs kill -9
isainfo -vb
s="124890";for i in $(seq 0 1 $((${#s}-1))); do arr[$i]=${s:$i:1}; done
echo a,b,c | sed -e s/,/\',\'/g -e s/^/\(\'/ -e s/$/\'\)/
[ -z "$VAR" ] && echo "VAR has not been set" && exit 1
explorer .
prev=0;next=1;echo $prev;while(true);do echo $next;sum=$(($prev+$next));prev=$next;next=$sum;sleep 1;done
*/15 * * * * /path/to/command
2009-08-30 14:53:08
User: sharfah
-9

Instead of using:

0,15,30,45 * * * * /path/to/command

while read server; do ssh -n user@$server "command"; done < servers.txt
2009-08-29 06:52:34
User: sharfah
Functions: read ssh
10

The important thing to note in this command, is the "-n" flag.