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

Search for a process by name

Terminal - Search for a process by name
psg(){ ps aux | grep -E "[${1:0:1}]${1:1}|^USER"; }
2015-01-01 00:12:45
User: flatcap
Functions: grep ps
-2
Search for a process by name

Function that searchs for process by its name:

* Shows the Header for reference

* Hides the process 'grep' from the list

* Case sensitive

The typical problem with using "ps | grep" is that the grep process shows up the in the output.

The usual solution is to search for "[p]attern" instead of "pattern".

This function turns the parameter into just such a [p]attern.

${1:0:1} is the first character of $1

.

${1:1} is characters 2-end of $1

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
ps -fC PROCESSNAME
2015-04-20 13:09:44
User: pooderbill
Functions: ps
Tags: grep function ps
14

ps and grep is a dangerous combination -- grep tries to match everything on each line (thus the all too common: grep -v grep hack). ps -C doesn't use grep, it uses the process table for an exact match. Thus, you'll get an accurate list with: ps -fC sh rather finding every process with sh somewhere on the line.

psg(){ ps aux | grep -v grep | egrep -e "$1|USER"; }
2014-12-31 22:27:27
Functions: egrep grep ps
Tags: grep function ps
-1

Function that searchs a process by its name and shows in the terminal.

* Shows the Header for reference

* Hides the process 'grep' from the list

* Case sensitive

psgrep() ... func to long, please look under "description"
2015-01-01 02:58:48
User: Xk2c
Functions: look
Tags: grep function ps
-10

David thanks for that grep inside!

here is mine version:

psgrep()

{

case ${1} in

( -E | -e )

local EXTENDED_REGEXP=1

shift 1

;;

*)

local EXTENDED_REGEXP=0

;;

esac

if [[ -z ${*} ]]

then

echo "psgrep - grep for process(es) by keyword" >&2

echo "Usage: psgrep [-E|-e] ... " >&2

echo "" >&2

echo "option [-E|-e] enables full extended regexp support" >&2

echo "without [-E|-e] plain strings are looked for" >&2

return 1

fi

\ps -eo 'user,pid,pcpu,command' w | head -n1

local ARG=''

if (( ${EXTENDED_REGEXP} == 0 ))

then

while (( ${#} > 0 ))

do

ARG="${1}"

shift 1

local STRING=${ARG}

local LENGTH=$(expr length ${STRING})

local FIRSCHAR=$(echo $(expr substr ${STRING} 1 1))

local REST=$(echo $(expr substr ${STRING} 2 ${LENGTH}))

\ps -eo 'user,pid,pcpu,command' w | grep "[${FIRSCHAR}]${REST}"

done

else

\ps -eo 'user,pid,pcpu,command' w | grep -iE "(${*})"

fi

}

Know a better way?

If you can do better, submit your command here.

Your point of view

You must be signed in to comment.