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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 03:48:21 222
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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Monitor bandwidth by pid

Nethogs is a useful tool for monitor bandwidth consumption by pid. Tested on Debian an CentOs

extract email addresses from some file (or any other pattern)

Identify all amazon cloudformation scripts recursively using ripgrep

This assumes you are in the cwd of where you put your s3 scripts. Its useful if someone decides to create aws cloudformation scripts and doesn't add the 'yaml' or .yml extension.

Check if port is open on remote machine

Check if port is open, if you don't have ncat on your machine.

Run a command on a remote machine

This counts the number of httpd processes running.

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

list block devices

Shows all block devices in a tree with descruptions of what they are.

List all bash shortcuts

This command shows the various shortcuts that can be use in bash, including Ctrl+L, Ctrl+R, etc... You can translate "\C-y" to Ctrl+y, for example.

Rename all subtitles files with the same name of mp4 files in same folder

Use this command if you want to rename all subtitles for them to have the same name as the mp4 files. NOTE: The order of "ls -1 *.mp4" must match the order of "ls -1 *.srt", run the command bellow to make sure the *.srt files will really match the movies after run this command: paste -d:

Binary Clock

Create a binary clock.

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