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.

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

Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Commands tagged grep from sorted by
Terminal - Commands tagged grep - 358 results
find . -name '*.txt' -print0 | parallel -0 -j+0 lzma
2010-07-28 21:01:12
Functions: find
Tags: find grep lzma
2

This will deal nicely with filenames containing newlines and will run one lzma process per CPU core. It requires GNU Parallel http://www.youtube.com/watch?v=OpaiGYxkSuQ

find . -name '*.txt' | grep -v '\.lzma$' | xargs -n 1 lzma -f -v -3
rm $( ls | egrep -v 'abc|\s' )
2010-07-18 10:59:15
User: dbbolton
Functions: egrep ls rm
Tags: grep rm
-1

Really, you deserve whatever happens if you have a whitespace character in a file name, but this has a small safety net. The truly paranoid will use '-i'.

alias dush="du -xsm * | sort -n | awk '{ printf(\"%4s MB ./\",\$1) ; for (i=1;i<=NF;i++) { if (i>1) printf(\"%s \",\$i) } ; printf(\"\n\") }' | tail"
2010-07-15 10:38:27
User: dopeman
Functions: alias
-1

Essentially the same as funky's alias, but will not traverse filesystems and has nicer formatting.

grep -R --include=*.cpp --include=*.h --exclude=*.inl.h "string" .
2010-07-14 16:32:28
User: sweinst
Functions: grep
Tags: find xargs grep
0

Gnu grep allows to restrict the search to files only matching a given pattern. It also allows to exclude files.

find . -name '*.?pp' -exec grep -H "string" {} \;
find . -name '*.?pp' | xargs grep -H "string"
2010-07-14 14:41:07
User: cout
Functions: find grep xargs
Tags: find xargs grep
2

I like this better than some of the alternatives using -exec, because if I want to change the string, it's right there at the end of the command line. That means less editing effort and more time to drink coffee.

grep -i '^DocumentRoot' /etc/httpd/conf/httpd.conf | cut -f2 -d'"'
vim --version | grep -P '^(\+|\-)' | sed 's/\s/\n/g' | grep -Pv '^ ?$'
2010-07-02 02:57:19
User: evaryont
Functions: grep sed vim
Tags: vim sed grep
2

The above output is for a custom compiled version of Vim on Arch Linux.

Just a quick shell one liner, and presents a list of all the enabled and disabled (those prefixed with a '-') features.

curl -s "http://www.socrata.com/api/views/vedg-c5sb/rows.json?search=Axelrod" | grep "data\" :" | awk '{ print $17 }'
2010-07-01 23:54:54
User: mheadd
Functions: awk grep
Tags: awk grep curl
2

Query the Socrata Open Data API being used by the White House to find any employee's salary using curl, grep and awk.

Change the value of the search parameter (example uses Axelrod) to the name of any White House staffer to see their annual salary.

function mg(){ man ${1} | egrep ${2} | more; }
2010-07-01 21:14:24
User: quincymd
Functions: egrep man
Tags: man grep
0

Quicker way to search man pages of command for key word

ifconfig eth0 | grep -o "inet [^ ]*" | cut -d: -f2
ifconfig eth0 | awk '/inet / {print $2}' | cut -d ':' -f2
wget -O - http://www.commandlinefu.com/commands/browse/rss 2>/dev/null | awk '/\s*<title/ {z=match($0, /CDATA\[([^\]]*)\]/, b);print b[1]} /\s*<description/ {c=match($0, /code>(.*)<\/code>/, d);print d[1]} ' | grep -v "^$"
2010-06-29 16:22:03
User: nikunj
Functions: awk grep wget
Tags: awk grep meta
2

A Quick variation to the latest commands list with the new-lines skipped. This is faster to read.

for f in $(find /path/to/base -type f | grep -vw CVS); do grep -Hn PATTERN $f; done
ifconfig eth0 | grep "inet " | cut -d ':' -f2 | awk '{print $1}'
2010-06-29 00:06:08
User: jaimerosario
Functions: awk cut grep ifconfig
5

I've been using it in a script to build from scratch proxy servers.

zgrep -h "" `ls -tr access.log*`
2010-06-19 09:44:05
User: dooblem
Functions: zgrep
2

I use zgrep because it also parses non gzip files.

With ls -tr, we parse logs in time order.

Greping the empty string just concatenates all logs, but you can also grep an IP, an URL...

aptitude remove $(dpkg -l|egrep '^ii linux-(im|he)'|awk '{print $2}'|grep -v `uname -r`)
2010-06-10 21:23:00
User: dbbolton
Functions: awk egrep grep
8

This should do the same thing and is about 70 chars shorter.

grep -Eo \([0-9]\{1,3\}[\.]\)\{3\}[0-9] file | sort | uniq
dpkg -l | cut -d' ' -f 3 | grep ^python$
grep -P '\t' filename
2010-05-02 02:24:14
Functions: grep
Tags: grep
3

-P tells grep to use perl regex matches (only works on the GNU grep as far as I know.)

grep <something> logfile | cut -c2-18 | uniq -c
2010-04-29 11:26:09
User: buzzy
Functions: cut grep uniq
Tags: uniq grep cut
4

The cut should match the relevant timestamp part of the logfile, the uniq will count the number of occurrences during this time interval.

df -l | grep -e "9.%" -e "100%"
2010-04-26 17:57:54
User: dooblem
Functions: df grep
2

Reports all local partitions having more than 90% usage.

Just add it in a crontab and you'll get a mail when a disk is full.

(sending mail to the root user must work for that)

vim -r 2>&1 | grep '\.sw.' -A 5 | grep 'still running' -B 5
2010-04-17 19:43:35
User: rkulla
Functions: grep vim
3

Catches .swp, .swo, .swn, etc.

If you have access to lsof, it'll give you more compressed output and show you the associated terminals (e.g., pts/5, which you could then use 'w' to figure out where it's originating from): lsof | grep '\.sw.$'

If you have swp files turned off, you can do something like: ps x | grep '[g,v]im', but it won't tell you about files open in buffers, via :e [file].

for i in `ls ~/.mozilla/firefox/*/Cache`; do file $i | grep -i mpeg | awk '{print $1}' | sed s/.$//; done
2010-04-11 23:14:18
User: TuxOtaku
Functions: awk file grep sed
4

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the names of those tunes straight out of FF's cache in a nice, easy to read list. What you do with them after that is *ahem* no concern of mine. ;)