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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 00:53:19 505
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 13:21:56 486
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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Adjust display hardware brightness [dbus way]

dd with progress bar

piping through 'pv' shows a simple progress/speed bar for dd. This is a replacement for my otherwise favorite 'while :;do killall -USR1 dd;sleep 1;done'

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Get notified when a job you run in a terminal is done, using NotifyOSD

This is an alias you can add to your .bashrc file to get notified when a job you run in a terminal is done. example of use sleep 20; alert Source:http://www.webupd8.org/2010/07/get-notified-when-job-you-run-in.html

Bash command to convert IP addresses into their "reverse" form

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Grab all .flv files from a webpage to the current working directory

I wanted all the 'hidden' .flv files from the http link in the command line; wget seemed appropriate, fed with output from lynx, grep the flv files and the normalised via sed (to remove the numeric bullet). Similar to the 'Grab mp3 files' fu. Replace link with your own, grep arg with something more interesting ;) See here for something along the same lines... http://www.commandlinefu.com/commands/view/1006/grab-mp3-files-from-your-favorite-netcasts-mp3blog-or-sites-that-often-have-good-mp3s Hope you find it useful! Improvements welcome, naturally.

Convert unix timestamp to date

The "-d" option for gnu's "date" command can calculate positive or negative offset from any time, including "now". You can even specify a source timezone (the output timezone can be set with the TZ environment variable). Useful! Fun! Not very well documented!

Search replace with Ansible style timestamps

$ ls httpd.conf httpd.conf.2015-07-22@14:43:20

Generate random valid mac addresses

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