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.

OpenID

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

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands tagged askapache

Hide

News

2010-03-03 - Commandlinefu @ SXSW 2010: Am going to be at SXSW this year, in case you want to submit any CLI nuggets or suggestions to me in person. Ping me on the @codeinthehole Twitter account.
2009-09-12 - Email updates now available: You can now enable email updates to let you know each time you're command is commented on.
2009-07-11 - API and javascript blog widget now available: A simple API has been released, allowing commands to be retrieved in various formats. This also allows commands to be embedded on blogs/homepages.
2009-05-17 - Added duplicate suggestions to the new command form: When adding a new command, a quick background search is performed to make sure you're not duplicating a command already in the system.

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands tagged askapache

Terminal - Commands tagged askapache - 6 results

xv() { case $- in *[xv]*) set +xv;; *) set -xv ;; esac }

2010-02-14 20:57:29

User: cfajohnson

Functions: set

Tags: bash debug tput ulimit askapache terminfo termcap set verbose xtrace

Up
Down

Turn shell tracing and verbosity (set -xv) on/off with 1 command!

Turn shell tracing and verbosity (set -xv) on/off in any Bourne-type shell

If either -x or -v is set, the function turns them both off.

If neither is on, both are turned on.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

function setx(){ sed '/[xv]/!Q2' <<< $- && { set +xv; export PS4=">>> "; } || { export PS4="`tput setaf 3`>>> `tput sgr0`"; set -xv; }; }

2010-02-14 01:25:44

User: AskApache

Functions: export sed set

Tags: bash debug tput ulimit askapache terminfo termcap set verbose xtrace

-1

Up
Down

Turn shell tracing and verbosity (set -xv) on/off with 1 command!

Running this command turns shell tracing and shell verbose debugging on or off. Not only does it do that, it also uses your terminals builtin method of setting colors to make debugging much easier.

It looks at the current shell options contained in the $- special bash variable and that lets this function set the opposite of the current value. So from the shell you could do a:

setx; echo "y" | ( cat -t ) | echo "d"; setx

and it will turn on debbuggin.

This is an amazingly useful function that is perfect to add system-wide by adding it to /etc/profile or /etc/bashrc.. You can run it from the shell, and you can also use it in your shell scripts like my .bash_profile - http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

psu(){ command ps -Hcl -F S f -u ${1:-$USER}; }

2009-11-13 06:10:33

User: AskApache

Functions: command ps

Tags: bash tree pstree process ps askapache username

Up
Down

Output Detailed Process Tree for any User

An easy function to get a process tree listing (very detailed) for all the processes of any gived user.

This function is also in my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

for c in `seq 0 255`;do t=5;[[ $c -lt 108 ]]&&t=0;for i in `seq $t 5`;do echo -e "\e[0;48;$i;${c}m|| $i:$c `seq -s+0 $(($COLUMNS/2))|tr -d '[0-9]'`\e[0m";done;done

2009-11-03 09:12:13

User: AskApache

Functions: c++ echo

Tags: bash color terminal askapache colors ansi escape terminfo termcap

Up
Down

Unbelievable Shell Colors, Shading, Backgrounds, Effects for Non-X

I've been using linux for almost a decade and only recently discovered that most terminals like putty, xterm, xfree86, vt100, etc., support hundreds of shades of colors, backgrounds and text/terminal effects.

This simply prints out a ton of them, the output is pretty amazing.

If you use non-x terminals all the time like I do, it can really be helpful to know how to tweak colors and terminal capabilities. Like:

echo $'\33[H\33[2J'

Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

( trap '' 1; ( nice -n 19 sleep 2h && command rm -v -rf /garbage/ &>/dev/null && trap 1 ) & )

2009-10-10 04:43:44

User: AskApache

Functions: command nice rm sleep trap

Tags: bash trap sleep process nohup logout at askapache nice processes /dev/null HUP SIGHUP

Up
Down

Schedule Nice Background Commands That Won't Die on Logout - Alternative to nohup and at

Check out the usage of 'trap', you may not have seen this one much. This command provides a way to schedule commands at certain times by running them after sleep finishes sleeping. In the example 'sleep 2h' sleeps for 2 hours. What is cool about this command is that it uses the 'trap' builtin bash command to remove the SIGHUP trap that normally exits all processes started by the shell upon logout. The 'trap 1' command then restores the normal SIGHUP behaviour.

It also uses the 'nice -n 19' command which causes the sleep process to be run with minimal CPU.

Further, it runs all the commands within the 2nd parentheses in the background. This is sweet cuz you can fire off as many of these as you want. Very helpful for shell scripts.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

for p in ${PATH//:/ }; do [[ -d $p && -x $p ]] && echo $p; done

2009-09-19 06:43:57

User: AskApache

Functions: echo

Tags: bash echo loop for test PATH builtin built-in askapache

Up
Down

Show only existing executable dirs in PATH using only builtin bash commands

Finds executable and existing directories in your path that can be useful if migrating a profile script to another system. This is faster and smaller than any other method due to using only bash builtin commands.