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.


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.

UpGuard checks and validates configurations for every major OS, network device, and cloud provider.
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

All commands from sorted by
Terminal - All commands - 12,425 results
stf=$(date +%s.%N);st=${stf/.*/};sn=%{stf/*./};for ((;;));do ctf=$( date +%s.%N );ct=${ctf/.*/};cn=${ctf/*./}; dtf=$(echo "scale=3; $ctf-$stf" | bc); dt=${dtf/.*/}; dt=${dt:=0};echo -en "\r$(date -u -d @$dt "+%H:%M:%S.${dtf/*./}")";done
stf=$(date +%s.%N);st=${stf/.*/};sn=%{stf/*./};for ((;;));do ctf=$( date +%s.%N );ct=${ctf/.*/};cn=${ctf/*./}; echo -en "\r$(echo "scale=3; $ctf-$stf" | bc)";done
2017-01-26 13:20:30
User: glaudiston
Functions: date echo
Tags: chronometer
0

A way for tracking times in bash

favorite --add myhost 'ssh [email protected]'
2017-01-23 18:15:03
User: djangofan
Tags: history
-3

Command 'favorite' to store your favorite commands from history.

find . -name "node_modules" -exec rm -rf '{}' \;
ex -c '1,$-1000d' -c 'wq' file
iw dev ath0 station dump
2017-01-09 00:50:49
Tags: wireless
0

When the wireless card is in AP mode, list the users which are connected to the network.

It uses the new nl80211 based CLI configuration utility for wireless devices.

It can be used, for example, in a dd-wrt based router through a telnet session to obtain client information.

git push --set-upstream origin master
2017-01-09 00:32:14
Tags: git
-1

After cloning an empty repository on the client ("git clone" just after "git init", for instance), "git push" fails.

In order to be able to push to this repository for the first time, you need to run the above command. It will link your local "master" branch to the "master" branch in the origin server, and push the changes.

This is only necessary only for the first push; after that, you can use just the commands "git push" or "git pull" in order to do this operations.

tr -d '\r' < vmargs.txt | tr '\n' ' '
2016-12-31 18:20:03
User: wytten12
Functions: tr
1

Read vmargs.txt, which is a text file that could either be DOS-style (\r\n) or UNIX-style (\n) line endings and join the lines with a space separator. Can this be shortened/made more elegant?

ftagmarks(){ jq -r --arg t "$1" '.children[] as $i|if $i.root == "tagsFolder" then ([$i.children[] as $j|{title: ($j.title), urls: [$j.children[].uri]}]) else empty end|.[] as $k|if ($k.title|contains($t)) then $k.urls else empty end|.[]?' "$2"; }
2016-12-24 15:12:04
User: qwertyroot
Functions: as
0

# Usage: ftagmarks TAG BOOKMARKS.JSON

ftagmarks Bash ~/.mozilla/firefox/*.default/bookmarkbackups/bookmarks-*.json

Tag can be partial matching, e.g. input 'Bas' or 'ash' will match 'Bash' tag.

# Exact tag matching:

ftagmark(){ jq -r --arg t "$1" '.children[] as $i|if $i.root == "tagsFolder" then ([$i.children[] as $j|{title: ($j.title), urls: [$j.children[].uri]}]) else empty end|.[] as $k|if $k.title == $t then $k.urls else empty end|.[]?' "$2"; }

Usage: ftagmark TAG BOOKMARKS.JSON

# List all tags:

ftagmarkl(){ jq -r '.children[] as $i | if $i.root == "tagsFolder" then $i.children[].title else empty end' "$1"; }

Usage: ftagmarkl BOOKMARKS.JSON

# Requires: `jq` - must have CLI JSON processor

http://stedolan.github.io/jq

pv -tpreb /dev/sdc2 | dd of=/dev/sdb2 bs=64K conv=noerror,sync
2016-12-22 03:18:09
User: 4fthawaiian
Functions: dd
0

uses the wonderful 'pv' command to give a progress bar when copying one partition to another. Amazing for long running dd commands

sed 's/^\([^>.]\)/#\1/;s/^>>> //;s/^\.\.\./ /'
2016-12-06 15:23:02
User: miniker84
Functions: sed
1

Used to copy and paste a terminal buffer of a python interactive session into an editor

zgrep 'pattern' /var/logs/apache2/access.log* | awk '{print $7}' | sort -n | uniq -c | sort -rn
ls -lart|lolcat -a
2016-11-18 02:45:39
User: knoppix5
Functions: ls
4

(example above is the 'ls' command with reduced output speed)

cat matching_files.txt | xargs sed -i '' "s/require('global-module')/require('..\/some-folder\/relative-module')/"
whatinstalled() { which "[email protected]" | xargs -r readlink -f | xargs -r dpkg -S ;}
whatinstalled () { local cmdpath=$(realpath -eP $(which -a $1 | grep -E "^/" | tail -n 1) 2>/dev/null) && [ -x "$cmdpath" ] && dpkg -S $cmdpath 2>/dev/null | grep -E ": $cmdpath\$" | cut -d ":" -f 1; }
2016-11-08 16:13:10
User: lordtoran
Functions: cut grep tail which
1

Put this one-line function somewhere in your shell init, re-login and try

whatinstalled <command>

This is an elaborate wrapper around "dpkg -S", with numerous safeguards. Symlinks and command aliases are resolved. If the searched command is not an existing executable file or was installed by some other means than dpkg/apt, nothing is printed to stdout, otherwise the package name.

grep -Hrn "text" .
for i in `pip list -o --format legacy|awk '{print $1}'` ; do pip install --upgrade $i; done
free && sync && echo 3 > /proc/sys/vm/drop_caches && free
grep -c ".*" filename
2016-10-26 22:32:23
User: zlemini
Functions: grep
1

Returns the number of lines in a file, emulates "wc -l" behavior with grep.

alias bman='man --html=x-www-browser'
2016-10-23 17:59:47
User: lordtoran
Functions: alias
Tags: man groff
4

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.

xmlstarlet ed -u '//food[calories="650"]/calories' -v "999" simple.xml
id <username> | sed s/' '/'\n'/g | sed s/,/',\n '/g | sed s/'('/' ('/g | sed s/uid/' uid'/g | sed s/gid/' gid'/g | sed s/=/' = '/g
printf -vl "%${COLUMNS:-`tput cols 2>&-||echo 80`}s\n" && echo ${l// /-};
2016-09-25 10:37:20
User: AskApache
Functions: echo printf
4

Unlike other methods that use pipes and exec software like tr or sed or subshells, this is an extremely fast way to print a line and will always be able to detect the terminal width or else defaults to 80. It uses bash builtins for printf and echo and works with printf that supports the non-POSIX `-v` option to store result to var instead of printing to stdout.

Here it is in a function that lets you change the line character to use and the length with args, it also supports color escape sequences with the echo -e option.

function L() { local l=; builtin printf -vl "%${2:-${COLUMNS:-`tput cols 2>&-||echo 80`}}s\n" && echo -e "${l// /${1:-=}}"; }

With color:

L "`tput setaf 3`="

1. Use printf to store n space chars followed by a newline to an environment variable "l" where n is local environment variable from $COLUMNS if set, else it will use `tput cols` and if that fails it will default to 80.

2. If printf succeeds then echo `$l` that contains the chars, replacing all blank spaces with "-" (can be changed to anything you want).

From: http://www.askapache.com/linux/bash_profile-functions-advanced-shell.html http://www.askapache.com/linux/bash-power-prompt.html

aws cloudfront list-distributions | jq -r '.DistributionList | .Items | .[] | .Id + " " + .Aliases.Items[]'
2016-09-19 06:36:59
User: hendry
Tags: aws jq awscli
0

Looking up the id of a CF domain can be painful. Not anymore with this tip.