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Transforms a file to all uppercase.
This is sample output - yours may be different.
-1

perl -i -ne 'print uc $_' $1

rbs · 2009-10-15 16:59:38 4
Remove all the files except abc in the directory
This is sample output - yours may be different.
-1

find * ! -name abc | xargs rm

eth2net · 2010-07-18 08:53:18 5
Easily find an old command you run
This is sample output - yours may be different.
-1

cat $HISTFILE | grep command

Stolas · 2013-05-01 13:11:05 7
Disable graphical login on Solaris
This is sample output - yours may be different.
-1

svcadm disable cde-login

fourty2 · 2011-03-24 13:05:15 3
revert one or more changesets in svn

Reverts the changes that were made in a particular revision, in the local working copy. You must commit the local copy to the repository to make it permanent. This is very useful for undoing a change. You can revert multiple changes by specifying numbers wider apart; Just remember to put the highest number first. Show Sample Output
This is sample output - yours may be different.
```
--- Reverse-merging r1337 into 'PATH':
U    PATH
```
-1

svn merge -r 1337:1336 PATH PATH

troelskn · 2009-02-06 00:48:17 45
Remove string with several escaped characters from all files under given path

Removes the given string from all files under the given path - in this case the path given is "." This demonstrates the characters that must be escaped for the grep and sed commands to do their work correctly. Very handy for fixing hacked html files.
This is sample output - yours may be different.
-1

S='<iframe src=\"http:\/\/254.254.254.254\/bad\/index.php\" width=\"1\" height=\"1\" frameborder=\"0\"><\/iframe>' && R=''; find . -name "*.html" -exec grep -l "$S" {} \; | xargs sed -i -e "s/$S/$R/g"

rexington · 2010-04-12 21:45:16 3
recursivly open all recently crashed vim buffers in restore mode

this is great if you loose you ssh connection (with out a screen session) or are working on a laptop with a bad battery, or just a power outage. Modifications: you may not need the -print; the mtime is last modified time in days
This is sample output - yours may be different.
-1

find ./ -type f -mtime -1 -name .*.sw[po] -print | sed -r 's/^(.+)\/\.(\S+)\.sw[op]$/\1\/\2/' | xargs vim -r

nodnarb · 2010-06-16 13:15:10 3
Remove all the files except abc in the directory

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'.
This is sample output - yours may be different.
-1

rm $( ls | egrep -v 'abc|\s' )

dbbolton · 2010-07-18 10:59:15 4
Get Top Trending Topic on Twiter by location

In these command i use lynx to get the top trend topic of Mexico, if you replace Mexico with other country, you will get the #1 Trending topic
This is sample output - yours may be different.
-1

lynx --dump http://en.trending-topic.com/countries/Mexico/ | grep "62]#" | sed 's/\[62\]//g'

xmuda · 2013-03-12 16:25:14 4

Listen and sort your music, with prompt for deleting (minimal alternative version)

The glob pattern * expands to all files, no need for the 'ls' command. The quotes around "$i" make sure filenames with spaces in them are handled correctly. mplayer determines if it is a media file and plays it, or gives errors and the loop asks if this file has to be removed. Show Sample Output

-1

for i in *; do mplayer "$i" && rm -i "$i"; done

warkruid · 2013-12-26 17:13:23 53

Sort a character string

using awk missed the last char thanks @Josay Show Sample Output
This is sample output - yours may be different.
```
aeeelmoprsst
```
-1

echo sortmeplease | awk '{l=split($1,a,"");asort(a);while(x<=l){printf "%s",a[x];x++ }print "";}'

foob4r · 2009-09-03 10:22:39 4
Multiple open files and go directly to the line where some string is

Open all files which have some string go directly to the first line where that string is and run command on it. Other examples: Run vim only once with multiple files (and just go to string in the first one): grep -rl string_to_find public_html/css/ | xargs vim +/string_to_find Run vim for each file, go to string in every one and run command (to delete line): grep -rl string_to_find public_html/css/ | xargs -I '{}' vim +/string_to_find {} -c ":delete"
This is sample output - yours may be different.
-1

grep -rl string_to_find public_html/css/ | xargs -I '{}' vim +/string_to_find {} -c ":s/string_to_find/string_replaced"

algol · 2012-11-07 14:44:51 5
arp-scan -l without duplicates

This command will scan the subnet and exlude duplicates
This is sample output - yours may be different.
-1

arp-scan -l -g -interface (nic)

pebkac · 2011-01-13 20:29:37 3
Parse logs for IP addresses and how many hits from each IP
This is sample output - yours may be different.
-1

cat "log" | grep "text to grep" | awk '{print $1}' | sort -n | uniq -c | sort -rn | head -n 100

jmorganwalker · 2014-07-08 15:07:24 10
Python version to a file
This is sample output - yours may be different.
-1

python -V >file 2>&1

ngaywood · 2018-11-07 00:53:19 506
Bold matching string without skipping others
This is sample output - yours may be different.
-1

sed 's/pattern/^[[1m&^[[0m/g'

rmcb · 2010-02-12 14:05:34 3
Length of longest line of code

Find the length of the longest line of code in your files. Show Sample Output
This is sample output - yours may be different.
```
96
```
-1

perl -ne 'push(@w, length); END {printf "%0d\n" , (sort({$b <=> $a} @w))[0]}' *.cpp

asolkar · 2010-05-11 19:46:37 4
Python version to a file

More direct like this Show Sample Output
This is sample output - yours may be different.
```
cat file
Python 2.7.12
```
-1

python -V 2> file

keltroth · 2018-11-07 13:21:56 487
Find Apache Root document

Where is my Apache public_html ?!
This is sample output - yours may be different.
-1

grep -i 'DocumentRoot' /usr/local/apache/conf/httpd.conf

locvfx · 2019-06-09 15:48:13 42
Rip audio tracks from CD to wav files in current dir

Rip audio tracks from CD to wav files in current dir
This is sample output - yours may be different.
-1

cdparanoia -B

hemanth · 2009-07-29 07:56:12 4
Continue a current job in the background

Often times you run a command in the terminal and you don't realize it's going to take forever. You can open a new terminal, but you lose the local history of the suspended one. You can stop the running command using , but that may produce undesirable side-effects. suspends the job, and (assuming you have no other jobs running in the background) %1 resumes it. Appending & tells it to run in the background. You now have a job running concurrently with your terminal. Note this will still print any output to the same terminal you're working on. Tested on zsh and bash. Show Sample Output
This is sample output - yours may be different.
```
$ hg pull
<ctrl+z>
zsh: suspended  hg pull
$ %1 &
[1] - continued  hg pull
$ ...
$
$ pulled 4 revisions
(run 'hg update' to get a working copy)

[1]  - done        hg pull
```
-1

<ctrl+z> %1 &

joem86 · 2010-10-25 17:43:38 5
Find out if a module is installed in perl

Will check if the given module is installed in the @INC. It will print the path and return 0 if found, or 1 otherwise. Based on script from SharpyWarpy in http://www.linuxquestions.org/questions/linux-general-1/how-to-list-all-installed-perl-modules-216603/ Show Sample Output
This is sample output - yours may be different.
```
/usr/local/share/perl5/Collectd/Plugins/Graphite.pm
```
-1

perl -MFile::Find=find -MFile::Spec::Functions -Tlwe '$found=1; find { wanted => sub { if (/$ARGV[0]\.pm\z/) { print canonpath $_; $found=0; } }, no_chdir => 1 }, @INC; exit $found;' Collectd/Plugins/Graphite

keymon · 2013-01-11 11:01:46 5
Watch Star Wars via telnet

If you don't have telnet, you can use the bash built-in tcp pipes.
This is sample output - yours may be different.
-1

cat < /dev/tcp/towel.blinkenlights.nl/23

kees · 2017-11-25 12:27:45 27

Give information about your graphic chipset

Use the lshw command to display information about your video card. Give more ouput when run as root. Show Sample Output

-1

lshw -C display

gwir · 2009-04-28 11:49:08 6

Email if you disk is over 90%

Email if you disk is over 90% - www.fir3net.com
This is sample output - yours may be different.
-1

HDD=$(df | awk ' NR>3 (S=$5) (M=$6) { if (S>90) print "Your Systems "M" is """S" Full" } ') ; [[ $HDD ]] && echo "$HDD" | mail -s "Hard-Drives Full" TO@EMAIL.com -- -f FROM@EMAIL.com >/dev/null

felix001 · 2009-10-16 06:52:36 5
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commandlinefu.com is the place to record those command-line gems that you return to again and again. 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.

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Grab a list of MP3s out of Firefox's cache

Grab a list of MP3s (with full path) out of Firefox's cache 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 *full path* of those tunes straight out of FF's cache in a clean list. Shorter and Intuitive version of the command submitted by (TuxOtaku)

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Run a command after the process you choose finishes

Run a command as soon as another long-running command finishes. E.g. suspend the machine after performing apt upgrade. The process is selected interactively via fzf.

Runs a command without hangups.

The improvement is that you can re-attach to the screen at a later point.

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

pngcrush all .png files in the directory

Find all pngs in directory structure and pngcrush them, none destructive. You can just remove the "{}.crush" part if you want destructive.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

diff output of two commands

This only works in bash

Set all CPU cores' CPU frequency scaling governor to maximum performance

convert all files in a dir of a certain type to flv

This converts all m4a files in a dir to flv. You can just swap the m4a bit to anything else ffmpeg supports though, and it'll work.

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