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

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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!

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Terminal - All commands - 12,422 results
for x in *.ex1; do mv "${x}" "${x%ex1}ex2"; done
setfile -a V foo.bar; setfile -a v foo.bar;
2009-08-12 17:16:03
User: JakeCarter
Tags: macosx finder

These commands will mark a file as hidden or visible to Mac OS X Finder. Notice the capitol V vs the lowercase v. This will also work for directories.

setfile -a V foo.bar; // This marks the file invisible

setfile -a v foo.bar; // This marks the file visible

I have also found that adding the following aliases are helpful:

alias hide='setfile -a V'

alias show='setfile -a v'

find . -name "*.[ch]" | xargs grep "TODO"
nmap -n -iR 0 -sL | cut -d" " -f 2
svn diff | view -
not necessarily better, but many...!
2009-08-12 11:03:26
Tags: bash awk

( IFS=:; for i in $PATH; do echo $i; done; )

echo $PATH|sed -e 's/:/\n/g' # but the tr one is even better of course

echo $PATH|xargs -d: -i echo {} # but this comes up with an extra blank line; can't figure out why and don't have the time :(

echo $PATH|cut -d: --output-delimiter='

' -f1-99 # note -- you have to hit ENTER after the first QUOTE, then type the second one. Sneaky, huh?

echo $PATH | perl -l -0x3a -pe 1 # same darn extra new line; again no time to investigate

echo $PATH|perl -pe 's/:/\n/g' # too obvious; clearly I'm running out of ideas :-)

watch "ps auxw | grep [d]efunct"
2009-08-12 08:11:16
User: alvinx
Functions: watch

to omit "grep -v", put some brackets around a single character

echo $PATH|awk -F: ' { for (i=1; i <= NF; i++) print $i }'
smbpasswd -r <domain-server> -U <user name>
2009-08-12 07:46:48
User: greppo

If you use Linux in a Windows domain and there are N days to expiry, this is how you can change it without resorting to a windows machine.

aria2c -s 4 http://my/url
2009-08-11 22:34:00
User: jrk

`aria2c` (from the aria2 project) allows. Change -s 4 to an arbitrary number of segments to control the number of concurrent connections. It is also possible to provide multiple URLs to the same content (potentially over multiple protocols) to download the file concurrently from multiple hosts.

img test.jpg
2009-08-11 22:09:21
User: Inouire
Tags: bash java picture

This command allows you to see a preview of a picture via the terminal. It can be usefull when you are ssh'ing your server without X-forwarding.

To have en example of the output you can get with this command see http://www.vimeo.com/3721117

Download at http://inouire.net/image-couleur.html

Sources here: http://inouire.net/archives/image-couleur_source.tar.gz

dmidecode 2.9 | grep "Maximum Capacity"; dmidecode -t 17 | grep Size
system_profiler | mail -s "$HOSTNAME System Profiler Report" [email protected]
2009-08-11 20:16:37
User: monkeymac
Functions: mail

Replace "[email protected]" with the target e-mail address. Thanks to alediaz for "$HOSTNAME" which is very useful when running the command with Apple Remote Desktop to multiple machines simultaneously.

find $MAILDIR/ -type f -printf '%[email protected] %p\n' | sort --reverse | sed -e '{ 1,100d; s/[0-9]*\.[0-9]* \(.*\)/\1/g }' | xargs -i sh -c "cat {}&&rm -f {}" | gzip -c >>ARCHIVE.gz
ps -A
2009-08-11 16:52:59
User: xraj
Functions: ps

list all the processes

perl -F',' -ane '$a += $F[3]; END { print $a }' test.csv
2009-08-11 15:08:58
Functions: perl
Tags: awk column CSV sum

More of the same but with more elaborate perl-fu :-)

php -i
php -r "phpinfo\(\);"
whois domainnametocheck.com | grep match
2009-08-11 13:33:25
User: Timothee
Functions: grep whois
Tags: whois

Returns nothing if the domain exists and 'No match for domain.com' otherwise.

watch "ps auxw | grep 'defunct' | grep -v 'grep' | grep -v 'watch'"
2009-08-11 12:22:13
Functions: watch

Shows all those processes; useful when building some massively forking script that could lead to zombies when you don't have your waitpid()'s done just right.

awk -F ',' '{ x = x + $4 } END { print x }' test.csv
php -r phpinfo();
2009-08-11 07:00:51
User: amaymon
Tags: PHP

Run the function phpinfo() on the shell

echo "<?php phpinfo(); ?>" >> /srv/www/htdocs/test.php
exiv2 rename *.jpg
find . -name '*'.tiff -exec bash -c "mogrify -format jpg -quality 85 -resize 75% {} && rm {}" \;
2009-08-10 18:27:10
Functions: bash find

Simple command to convert a large number of images into jpeg-format. Will delete originals after conversion.