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df output, sorted by Use% and correctly maintaining header row
This is sample output - yours may be different.
-1

df -h | sort -r -k 5 -i

Mohammad · 2016-12-05 16:00:31 15
Remove all .svn folders inside a folder
This is sample output - yours may be different.
-1

find . -name "\.svn" -exec rm -rf {} ";"

caiosba · 2009-05-14 12:02:25 9
search for a file in PATH

search argument in PATH accept grep expressions without args, list all binaries found in PATH Show Sample Output
This is sample output - yours may be different.
```
$ sepath noo
/usr/openwin/bin/ttsnoop
/usr/sbin/snoop
$ sepath ^ps$
/bin/ps
/usr/bin/ps
/usr/ucb/ps
```
-1

function sepath { echo $PATH |tr ":" "\n" |sort -u |while read L ; do cd "$L" 2>/dev/null && find . $ ! -name . -prune $ $ -type f -o -type l $ 2>/dev/null |sed "s@^\./@@" |egrep -i "${*}" |sed "s@^@$L/@" ; done ; }

mobidyc · 2009-09-11 15:03:22 5

Function that searchs a process by its name and shows in the terminal. * Shows the Header for reference * Hides the process 'grep' from the list * Case sensitive Show Sample Output

-1

psg(){ ps aux | grep -v grep | egrep -e "$1|USER"; }

ivanalejandro0 · 2014-12-31 22:27:27 9

(tcsh alias)Reverse an IPv4 address. It is useful to looking the address up in DNSBL.

For 'bash' function ip4rev() { echo $@ | sed 's/^$[0-9]*$\.$[0-9]*$\.$[0-9]*$\.$[0-9]*$/\4.\3.\2.\1/'; } Show Sample Output
This is sample output - yours may be different.
```
% ip4rev '192.0.2.34'
34.2.0.192

% dig +sh a `ip4rev 127.0.0.2`.zen.spamhaus.org.
127.0.0.2
127.0.0.4
127.0.0.10
```
-1

alias ip4rev "echo \!* | sed 's/^$[0-9]*$\.$[0-9]*$\.$[0-9]*$\.$[0-9]*$/\4.\3.\2.\1/'"

azumakuniyuki · 2009-02-09 17:00:03 10
Describe differences between files
This is sample output - yours may be different.
-1

comm --nocheck-order -31

dullgiulio · 2011-06-02 19:17:46 7
Find the biggest files

Show the top file size in human readable form
This is sample output - yours may be different.
-1

find -type f | xargs -I{} du -s "{}" | sort -rn | head | cut -f2 | xargs -I{} du -sh "{}"

glaudiston · 2011-01-04 11:10:56 3
Save your webcam to file
This is sample output - yours may be different.
-1

cvlc "v4l2:///dev/video0" --sout "#transcode{vcodec=mp2v,vb=800,scale=0.25,acodec=none}:file{mux=mpeg1,dst=/PATH/TO/OUTPUT/FILE}"

bitbasher · 2011-08-21 14:25:24 5
Emulate sleep in DOS/BAT

In the vein of "can you do it better", here is my take on using "ping" to emulate sleep in a DOS/BAT script. If one can use ping at all then the multicast address will be valid but will not respond. By doing only one ping (-n 1) and setting a timeout in milliseconds (-w 10000) you have a fairly accurate timer. This example gives about a 10 second sleep.
This is sample output - yours may be different.
-1

ping -n 1 -w 10000 224.0.0.0

DocGyver · 2009-08-26 02:25:07 9
calculate the total size of files in specified directory (in Megabytes)

the command will not include hidden files Show Sample Output
This is sample output - yours may be different.
```
$ls -l | awk 'BEGIN { SUM=0 } { SUM+=$5 } END { print SUM/1024/1024"M" }'
11.35349M
```
-1

ls -l directory | awk 'BEGIN { SUM=0 } { SUM+=$5 } END { print SUM/1024/1024"M" }'

emacs · 2010-06-04 01:51:04 3
Reducing image size

Reduces the size of images.
This is sample output - yours may be different.
-1

convert -quality 40% original_image reduced_image

tsudot · 2010-08-08 03:50:30 5
Get current stable kernel version string from kernel.org
This is sample output - yours may be different.
-1

curl -s kernel.org | grep '<strong>' | head -3 | tail -1 | cut -d'>' -f3 | cut -d'<' -f1

mdix · 2012-06-15 21:28:42 22
Google text-to-speech in mp3 format
This is sample output - yours may be different.
-1

text-to-speech

girao · 2014-09-18 01:25:06 8
search for a file in PATH

Searches in order of the directories of $PATH. Stops after finding the entry; looks for only that fileName. Works in Bourne, Korn, Bash and Z shells. Show Sample Output
This is sample output - yours may be different.
```
/usr/local/bin/fileName
```
-1

for L in `echo :$PATH | tr : '\n'`; do F=${L:-"."}/fileName; if [ -f ${F} -o -h ${F} ]; then echo ${F}; break; fi; done

arcege · 2009-09-11 16:14:36 3
ffmpeg vhook imlib2.so
This is sample output - yours may be different.
-1

ffmpeg -i input.flv -vhook '/usr/lib/vhook/imlib2.so -c white -x 250 -y H+(-1.8*N+80) -t Hallo! -A max(0,255-exp(N/16))' -sameq -acodec copy output.flv

opexxx · 2009-10-06 07:08:02 3
Find the biggest files
This is sample output - yours may be different.
-1

find -type f -exec du -sh {} + | sort -rh | head

depesz · 2011-01-04 11:38:29 5
Find and replace

You can replace "." with your folder
This is sample output - yours may be different.
-1

find . -name '*.txt' -exec mv {} {}.sh \ ;

wilbercarmona · 2011-06-02 23:47:19 3
Generat a Random MAC address

I liked vaporub's suggestion, here a little simplification of the sed command.
This is sample output - yours may be different.
-1

MAC=$((date +'%Y%m%d%H%M%S%N'; cat /proc/interrupts) | md5sum | sed -r 's/(..)/\1:/g' | cut -d: -f 1-6)

jazznjam · 2011-07-14 13:11:50 3
A simple way find total Memory capacity of the system

Show Sample Output
This is sample output - yours may be different.
```
Memory: 192 GB
```
-1

echo "Memory:" $(dmidecode --type memory | grep " MB" | awk '{sum += $2; a=sum/1024} END {print a}') "GB"

bp · 2014-02-18 06:20:34 9
Store Host IP in variable
This is sample output - yours may be different.
-1

export IP="$(hostname -I | awk '{print $1}')"

wuseman1 · 2021-08-10 03:48:21 218
Reducing image size

You can also specify width and height of the resized image (in pixels), as an alternative to using a percentage.
This is sample output - yours may be different.
-1

convert example.png -resize 100x100 output.png

dbbolton · 2010-08-08 16:40:21 3
Find redirection and grep

You can find every file with png extension and redirect its output to file. Later you can find a string inside the file.
This is sample output - yours may be different.
-1

find . -name "*.png" | tee images.txt | grep book

wilbercarmona · 2011-06-02 23:55:50 4
copy root to new device

preserve all except context and xattr. useful when moving a running system to a new partition.
This is sample output - yours may be different.
-1

cp -dpRx /* /mnt/target/

unixmonkey24812 · 2011-08-22 14:22:01 5
Print full LVM LV paths (for copy&paste)
This is sample output - yours may be different.
-1

vgdisplay -v 2>/dev/null | grep "^ LV Name" | while read A B LVDEV; do echo $LVDEV; done

f4m8 · 2011-12-09 14:57:50 4
Check a nfs mountpoint and force a remount if it does not reply after a given timeout.

Based on the execute with timeout command in this site. A more complex script: #!/bin/sh # This script will check the avaliability of a list of NFS mount point, # forcing a remount of those that do not respond in 5 seconds. # # It basically does this: # NFSPATH=/mountpoint TIMEOUT=5; perl -e "alarm $TIMEOUT; exec @ARGV" "test -d $NFSPATH" || (umount -fl $NFSPATH; mount $NFSPATH) # TIMEOUT=5 SCRIPT_NAME=$(basename $0) for i in $@; do echo "Checking $i..." if ! perl -e "alarm $TIMEOUT; exec @ARGV" "test -d $i" > /dev/null 2>&1; then echo "$SCRIPT_NAME: $i is failing with retcode $?."1>&2 echo "$SCRIPT_NAME: Submmiting umount -fl $i" 1>&2 umount -fl $i; echo "$SCRIPT_NAME: Submmiting mount $i" 1>&2 mount $i; fi done
This is sample output - yours may be different.
-1

NFSPATH=/mountpoint TIMEOUT=5; perl -e "alarm $TIMEOUT; exec @ARGV" "test -d $NFSPATH" || (umount -fl $NFSPATH; mount $NFSPATH)

keymon · 2010-06-04 07:58:53 3
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Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Upload a video to youtube

Google just released a new commend line tool offering all sorts of new services from the commend line. One of them is uploading a youtube video but there are plenty more google services to interact with. Download it here: http://code.google.com/p/googlecl/ Manual: http://code.google.com/p/googlecl/wiki/Manual

Execute a command at a given time

This command will create a popup reminder window to assist in remembering tasks http://i.imgur.com/2n7viiA.png is how it looks when created

diff the outputs of two programs

I've been looking for this for a long time. Does anybody know how to do this in dash (POSIX shell)? An alternative version might be: $ exiftool img_1.jpg | diff -

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

a find and replace within text-based files, to locate and rewrite text en mass.

syntax follows regular command line expression. example: let's say you have a directory (with subdirs) that has say 4000 .php files. All of these files were made via script, but uh-oh, there was a typo! if the typo is "let's go jome!" but you meant it to say "let's go home!" find . -name "*.php" | xargs perl -pi -e "s/let\'s\ go\ jome\!/let\'s\ go\ home\!/g" all better :) multiline: find . -name "*.php" | xargs perl -p0777i -e 's/knownline1\nknownline2/replaced/m' indescriminate line replace: find ./ -name '*.php' | xargs perl -pi -e 's/\".*$\"/\new\ line\ content/g'

Check if you work on a virtual/physical machine in Linux

Command used to know if we are working on a virtual or physical machine. This command will use the dmidecode utility to retrieve hardware information of your computer via the BIOS. Run this command as root or with sudo.

Get a regular updated list of zombies

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.

Convert text to lowercase

Usage: lower [STRING]...

Decreasing the cdrom device speed

Decreasing the cdrom device speed may be more comfortable to watch films (for example)

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