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Run a script every time that script is saved (great for script development)

use fsnotify on linux, fswatch on OS-X
This is sample output - yours may be different.
0

fswatch -o my-script.sh | xargs -n1 ./my-script.sh

ximus · 2015-12-01 22:34:45 14
Files modified today
This is sample output - yours may be different.
0

ls *(m-1)

int9h · 2009-02-18 22:33:36 12
Sort a character string

another possibility
This is sample output - yours may be different.
0

echo sortmeplease|sed 's/./&\n/g'|sort|tr -d '\n'

foob4r · 2009-09-03 10:37:57 3
Send a local file via email

uuencode the file to appear as an attachment
This is sample output - yours may be different.
0

cat filename | uuencode filename | mail -s "Email subject" user@example.com

amaymon · 2009-09-21 04:13:50 9
Instant editing screenshot with Gimp
This is sample output - yours may be different.
0

sleep 4; F="$(tempfile -s '.xwd')"; xwd > "$F" ; gimp "$F"

krissi · 2010-09-23 12:48:48 3
Shows how many percents of all avaliable packages are installed in your gentoo system

Use bc for decimals...
This is sample output - yours may be different.
0

echo $(echo 'scale=2; ' '100 * ' $(eix --only-names -I | wc -l) / $(eix --only-names | wc -l) | bc -l)%

MeaCulpa · 2010-10-25 15:42:15 3
Console clock

Clock will appear in the top-right corner
This is sample output - yours may be different.
0

watch -n 1 :

daniele · 2011-02-16 13:38:37 13
Convert high resolution JPEG for web publication
This is sample output - yours may be different.
0

convert /home/user/file.jpg -resize 800x533 -strip -quality 80 -interlace line /home/user/web_file.jpg

vtrone · 2011-10-10 08:45:04 4
grep directory and sub-directories

You don't need to use "*", it will fail if the working directory has too many fails due parameter extension, you can simply pass the working directory using ".".
This is sample output - yours may be different.
0

grep -r <searchterm> .

unixmonkey22658 · 2012-02-08 11:58:21 3
Replaces spaces in filename with _ and converts upper to lower case

All files in the directory will be renamed replacing every space in the filename by "_" (underline) and converting upper case characters to lower case characters. e.g. Foo Bar.txt --> foo_bar.txt
This is sample output - yours may be different.
0

for file in * ; do mv "$file" `echo "$file" | tr ' ' '_' | tr '[A-Z]' '[a-z]'`; done

cengztr · 2012-05-06 17:54:06 3
Get the IP address

more variety
This is sample output - yours may be different.
0

ifconfig | grep "inet" | tail -1 | awk '{print $2}'

wotan · 2012-07-13 01:27:59 3
Get Current CPU Usage

Get the current cpu % usage on your system. Show Sample Output
This is sample output - yours may be different.
```
13.50
```
0

top -n2 -d 0.5 | grep ^Cpu | sed 's/[[:alpha:]%]*//g' | awk 'NR == 2 {printf("%.2f\n",100-$5)}'

wizzra · 2012-09-06 12:56:26 5
Open all files with a regular expression in vim
This is sample output - yours may be different.
0

vim $(grep [REGULAR_EXPRESSION] -R * | cut -d":" -f1 | uniq)

eduardostalinho · 2012-11-07 19:30:24 4
cut log from line 50 to line 88

cut log from line 50 to line 88
This is sample output - yours may be different.
0

cat -n install.log | head -88 | tac | head -n $(( 88 - 50 )) | tac

cuizhaohua · 2013-05-02 08:39:54 6
List all symbolic links in current directory

I use this with alias: alias lsl="ls -1F | grep @ | sed 's/@//' | column"
This is sample output - yours may be different.
0

$ ls -1F | grep @ | sed 's/@//' | column

jlbknr · 2013-07-19 17:41:03 7
grep an array item, like a_var[11], in a file

Just want to show the "+" usage in the grep command. And if using egrep, thing would be a little bit easier: grep -n "arrname\[[[:digit:]]+\]" filename Show Sample Output
This is sample output - yours may be different.
```
filename:11: printf("%d\n", arrname[1]);
filename:14: printf("%d\n", arrname[12]);
```
0

grep -n "arrname\[[[:digit:]]\+\]" filename

sleepy_11 · 2014-07-09 08:02:01 7
Get all URL With Extension from File
This is sample output - yours may be different.
0

cat File.txt | grep -io 'http://www.acme.com/a/files/.*.pdf'| uniq

nedzoul · 2014-10-31 14:51:57 8
Sort the size usage of a directory tree
This is sample output - yours may be different.
0

du --max-depth=1 -h --apparent-size | sort -rh

Rudolf · 2015-06-11 14:25:15 11

Find the largest C/C++ source files in all subdirectories

This is helpful when approaching a new codebase and wondering where the bulk of the code is located Show Sample Output

find . -name '*.c*' -o -name '*.h' -exec wc -l {} \; | sort -n | tail

mediocrejoker · 2015-12-02 00:30:42 10

get all the IP addresses currently blocked by UFW (uncomplicated firewall)

Useful in scripts to compare known malicious IP addresses with what you are actually blocking. Show Sample Output
This is sample output - yours may be different.
```
217.118.95.89
217.12.113.114
```
0

ufw status | sort | uniq | grep -E -o "([0-9]{1,3}[\.]){3}[0-9]{1,3}"

harvix · 2017-02-17 12:12:44 18
Find files and play them as a playing list in mpv

Find music types on your current location and will play them randomly with mpv/mplayer.
This is sample output - yours may be different.
0

find . -type f $ -name "*.mp3" -o -name "*.ogg" $ | mpv --shuffle --audio-display=no --playlist -

Manifest0 · 2017-11-25 10:08:51 20
Parse tektronic csv files

Parses tektronic given csv files for both channel 1 and channel 2 and joins them together. Can be easily used by gnuplot after that.
This is sample output - yours may be different.
0

awk 'BEGIN {FS=","} {loc = $4, val=$5; getline < "f0001ch1.csv"; print loc,val,$5}' f0001ch2.csv > data

Masse · 2009-02-27 13:01:16 5

Apply all pending updates to Mandriva Linux system (2008.0 and newer).

Update a Mandriva Linux system with any pending updates. This command needs to be run with root privilege. Using the "--force" option answers "yes" to any interactive prompts thus allowing the updates to be left unattended to completion. NB if there is an update for glibc and/or a new kernel then the system would need to be rebooted for these to take effect. A prerequisite for running "urpmi --auto-update" is to have correctly defined urpmi media sources (which can be done by visiting http://easyurpmi.zarb.org/). If there are no new updates the the message "Packages are up to date" is shown. Show Sample Output

urpmi --auto-update --force # apply all pending updates (Mandriva Linux)

mpb · 2009-03-28 14:59:26 8

Extract URL from SVN working copy

Can be used in a working copy to output the URL (extracted from svn info), or as part of another function, as $(svnurl some/path). Saves a lot of time in my SVN workflow.
This is sample output - yours may be different.
0

function svnurl() { svn info $1 | egrep '^URL: (.*)' | sed s/URL\:\ //; }

thebuckst0p · 2010-02-12 15:42:54 3
Length of longest line of code

More straightforward. Show Sample Output
This is sample output - yours may be different.
```
96
```
0

perl -ne '$w = length if (length > $w); END {print "$w\n"}' *.cpp

asolkar · 2010-05-11 19:53:07 4
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Show most common words in filenames

I'm sure there's a more elegant sed version for the tr + grep section.

Display information sent by browser

Have netcat listen on port 8000, point browser to http://localhost:8000/ and you see the information sent. netcat terminates as soon as your browser disconnects. I tested this command on my Fedora box but linuxrawkstar pointed out that he needs to use $ nc -l -p 8000 instead. This depends on the netcat version you use. The additional '-p' is required by GNU netcat that for example is used by Debian but not by the OpenBSD netcat port used by my Fedora system.

Automator Bash script to create Clean zips in MacOS Finder without __MACOSX metadata

Finder compresses to ZIP but always includes extraneous metadata files (__MACOSX and .DS_Store) files and folders that may confuse other programs. One alternative is creating them and then editing the ZIP. This can work standalone or in an automator script accepting multiple selections (files or folders) and creating one zip per argument/selected file without that metada.

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"

check open ports without netstat or lsof

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"

Check hashes of files installed by Debian packages, reporting only errors.

Backup with versioning

Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

Rename files in batch

Get full from half remembered commands

Show all commands having the part known by you. Eg: $apropos pdf | less

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