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redirect STDOUT and STDERR to STDOUT and also to a file
This is sample output - yours may be different.
0

command_line 2>&1 | tee -a output_file

esplinter · 2014-04-05 13:02:30 6
My git log alias
This is sample output - yours may be different.
0

git log --graph --decorate --pretty=oneline --abbrev-commit

nicolasmccurdy · 2014-07-16 02:07:23 6
relax with philosophy while taking a dig
This is sample output - yours may be different.
0

for i in `seq 1 100`; do echo "I think therefore I am" | espeak; done

marlboro · 2014-11-08 06:30:11 10
Remove excess noise from a set of mp4 videos.

Full command: for f in input/*; do BN=$(basename "$f"); ffmpeg -i "$f" -vn "temp/$BN.flac"; sox "temp/$BN.flac" "temp/$BN-cleaned.flac" noisered profile 0.3; ffmpeg -i "$f" -vcodec copy -an "temp/$BN-na.mp4"; ffmpeg -i "temp/$BN-na.mp4" -i "temp/$BN-cleaned.flac" "output/$BN"; done This was over the 255 character limit and I didn't feel like deliberately obfuscating it. 1. Create 'input', 'output' and 'temp' directories. 2. Place the files that you want to remove the hiss/static/general noise from in the input directory. 3. Generate a noise reduction profile with sox using 'sox an_input_file.mp4 -n trim x y noiseprof profile', where x and y indicates a range in seconds that only the sound you want to eliminate is present in. 4. Run the command.
This is sample output - yours may be different.
0

for f in input/*; do BN=$(basename "$f"); ffmpeg -i "$f" -vn "temp/$BN.flac"...

samcamwilliams · 2015-03-01 02:48:19 8
count files and directories disk space usage

can be pointed at specific files using: du -ahc /path/to/file counting only directories is faster: du -hc .
This is sample output - yours may be different.
0

du -ahc

lolssl · 2015-10-01 19:38:39 10
replace color in image sequence
This is sample output - yours may be different.
0

mogrify -path ../png_white/ -fuzz 3.5% -fill white -opaque "#50566b" *.png

ceddi · 2016-10-17 20:01:00 16

Run a job in the background and prefix it's output with some string. This is particularly useful if you are running inside a docker container in a startup script (sue me, I'll run two jobs in a docker container if I want to) and you can run something like: /usr/sbin/nginx 2>&1 | awk '{print "[NGINX] " $0}' & /opt/jws-3.1/tomcat8/bin/catalina.sh run 2>&1 | awk '{print "[TOMCAT] " $0}' & while true; do ; done it can also be combined with tee to create a file log as well as a stdout log, for example if the script above where a script called "/bin/start-container.sh" then you could run /bin/start-container.sh | tee /var/log/containerlogs Show Sample Output

nginx 2>&1 | awk '{print "[NGINX] " $0}' &

hvindin · 2017-04-25 22:18:38 20

kill the first docker container in docker ps

Useful when developing and you donut usually have other docker commands running Show Sample Output
This is sample output - yours may be different.
```
 2018-05-24 15:06:10 ? |ruby-2.4.1| Jim-Park-MacBook-Pro in ~/workspace/example
±  |master ?| ? docker kill $(docker ps -q)
abc123456789
```
0

docker kill $(docker ps -q)

jim80net · 2018-05-24 22:11:06 207
find&grep all in once

calls grep on all non-binary files returned by find on its current working directory Show Sample Output
This is sample output - yours may be different.
```
./Main.java://	public static void main(String[] args) throws IOException
```
-1

#!/bin/bash find | grep -P -v "(class)|(zip)|(png)|(gz)|(gif)|(jpeg)|(jpg)" | xargs -I @ grep -H $1 @

kirdie · 2011-10-14 13:28:49 4
Terminate script or shell if not launched as root

This example code is intended to be used as a root permissions check in a script. It makes use of the $EUID (effective user ID) environment variable which is fully su- and sudo-safe.
This is sample output - yours may be different.
-1

if [[ $EUID -ne 0 ]]; then echo 'Root permissions required! Exiting.'; exit; fi

lordtoran · 2011-11-19 23:06:52 8
Spotlight Server Disabled
This is sample output - yours may be different.
-1

cd /System/Library/LaunchDaemons; sudo launchctl load -w com.apple.metadata.mds.plist

evandrix · 2012-05-16 15:42:10 4
umount --rbind mount with submounts

set CDIR for it to work right..
This is sample output - yours may be different.
-1

for i in `cat /proc/mounts | awk '{print $2}' | grep ${CDIR} |sort -r` ; do umount $i; done

mordjah · 2013-05-07 23:46:27 5
Tar - Compress by excluding folders

Tar - Compress by excluding folders Show Sample Output
This is sample output - yours may be different.
```
Tar - Compress by excluding folders
```
-1

tar -cvf /path/dir.tar /path/dir* --exclude "/path/dir/name" --exclude "/path/dir/opt"

sandeepverma · 2009-12-15 09:48:41 3
Get iPhone OS firmware URL (.ipsw)

Usage: get-ipsw device-name generation-string firmware-version For example: get-ipsw iPod 2,1 4.0 Different generation strings: iPhone 3G: iPhone 1,2 iPhone 3GS: iPhone 2,1 iPod touch 2G: iPod 2,1 iPod touch 3G: iPod 3,1 This can be used with idevicerestore (I haven't tried it though). http://github.com/posixninja/idevicerestore Based on: http://www.tuaw.com/2010/06/21/ios-4-0-firmware-release-expected-momentarily-quick-terminal-ti/ Show Sample Output
This is sample output - yours may be different.
```
http://appldnld.apple.com.edgesuite.net/content.info.apple.com/iPhone4/061-7435.20100621.tr49t/iPod2,1_4.0_8A293_Restore.ipsw
```
-1

get-ipsw(){ curl -s -L http://phobos.apple.com/version | sed -rn "s|[\t ]*<string>(http://appldnld\.apple\.com\.edgesuite\.net/content\.info\.apple\.com/iPhone[0-9]?/[^/]*/$1$2_$3_[A-Z0-9a-z]*_Restore\.ipsw)</string>|\1|p" | uniq; }

matthewbauer · 2010-06-22 02:34:15 5

Get a file's type and metadata

Some shell newbies don't know this very handy file management related command so I decided to include it here. You need to have the "file" package installed. Show Sample Output

-1

file <filename>

lordtoran · 2011-11-19 23:39:29 3

list each file/directory size in a directory
This is sample output - yours may be different.
-1

ls | xargs -I{} du -sh {}

kenshin54 · 2013-07-28 04:18:25 8
Push current task to background (paused) and resume it.

Saves opening another console terminal (eg. CTRL+ALT+F[n]) or opening another remote terminal. Ctrl+Z pauses the current task and pushed it to the background, leaving you with a command prompt for those "Oh crap I forgot to change xyz before I ran that and it'll take forever if I Ctrl+C and start again..." situations. Typing 'fg' (shorthand for foreground, that's how I remember it) will resume the paused task. Show Sample Output
This is sample output - yours may be different.
```
$ dd if=/dev/zero of=test.file
^Z
[1]+  Stopped                 dd if=/dev/zero of=test.file
$ echo "I needed to do this."
I needed to do this.
$ fg
dd if=/dev/zero of=test.file
```
-1

<CTRL+Z>; fg

kbrotheridge · 2014-04-06 14:21:08 7
Use ping to test if a server is up

Bash scrip to test if a server is up, you can use this before wget'ing a file to make sure a blank one isn't downloaded.
This is sample output - yours may be different.
-1

if [ "$(ping -q -c1 google.com)" ];then wget -mnd -q http://www.google.com/intl/en_ALL/images/logo.gif ;fi

alf · 2010-03-23 04:15:03 10
Convert wma to wav
This is sample output - yours may be different.
-1

for i in *.wma; do mplayer -vo null -vc dummy -af resample=44100 -ao pcm:waveheader:file="${i%.wma}.wav" "$i" ; done

schef · 2011-01-18 14:41:17 3
Show seconds since modified of newest modified file in directory
This is sample output - yours may be different.
-1

echo $(( $( date +%s ) - $( stat -c %Y * | sort -nr | head -n 1 ) ))

depesz · 2011-05-12 14:29:45 3
lsof - cleaned up for just open listening ports, the process, and the owner of the process
This is sample output - yours may be different.
-1

alias oports="echo -e "User:\tCommand:\tPort:\n----------------------------" && lsof -i 4 -P -n | awk '/LISTEN/ {print $3, $1, $9}' | sed 's/ [a-z0-9\.\*]*:/ /' | sort -u -k 3 -n | xargs printf '%-10s %-10s %-10s\n'"

rthemocap · 2011-08-04 16:39:04 4
Get video information with ffmpeg

mp4box is great when working with mp4s
This is sample output - yours may be different.
-1

mp4box -info video.mp4

alienresident · 2013-01-18 14:43:29 5
Binary digits Matrix effect
This is sample output - yours may be different.
-1

perl -e 'use Term::ANSIColor;$|++; while (1) { print color("green")," " x (rand(35) + 1), int(rand(2)), color("reset") }'

mvrpl · 2017-04-26 14:05:48 20
bash function to check for something every 5 seconds

Every seconds do Show Sample Output
This is sample output - yours may be different.
```
Every 10,0s: ls /tmp                           Fri Sep  4 19:19:11 2009
...
<list of files>
```
-1

watch -n <seconds> <command>

aonick · 2009-09-04 15:19:42 3

Play a stream and give back the shell

I wanted to play a song from the shell and get the shell back, I also dont want to store the file if it is not needed. edit, not sure if I need to mention it... killall vlc to stop it Show Sample Output

-1

wget http://somesite.com/somestream.pls; cvlc somestream.pls&sleep 5; rm somestream.pls*

tomjrace · 2011-08-04 19:24:18 3

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split a string (3)

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Runs previous command but replacing

Replaces the first instance of 'foo' with 'bar'. To replace all instances of 'foo' with 'bar': !!:gs/foo/bar/

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"

If (and only if) the variable is not set, prompt users and give them a default option already filled in.

The read command reads input and puts it into a variable. With -i you set an initial value. In this case I used a known environment variable.

Watch YouTube and other Flash videos via mplayer (or whatever)

Many sites with Flash video players will download video files to /tmp on Linux, with temporary filenames like "FlashbGTHm4". These will often play in mplayer, totem, or other movie playing software. You must first navigate to a video page, let it start loading, and then pause playback.

Check every URL redirect (HTTP status codes 301/302) with curl

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"

Find the package that installed a command

Create a new file

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