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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 03:48:21 227
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
How many lines does the passwd file have?
This is sample output - yours may be different.
-1

cat /etc/passwd | wc -l

wilbercarmona · 2011-06-03 00:05:20 26
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Compress and store the image of a disk over the network

Create an image of "device" and send it to another machine through the network ("target" and "port" sets the ip and port the stream will be sent to), outputting a progress bar On the machine that will receive, compress and store the file, use: $nc -l -p | 7z a -si -m0=lzma2 -mx=9 -ms=on Optionally, add the -v4g switch at the end of the line in order to split the file every 4 gigabytes (or set another size: accepted suffixes are k, m and g). The file will be compressed using 7z format, lzma2 algorithm, with maximum compression level and solid file activated. The compression stage will be executed on the machine which will store the image. It was planned this way because the processor on that machine was faster, and being on a gigabit network, transfering the uncompressed image wasn't much of a problem.

A function to find the newest file in a directory

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"

list block devices

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

extract element of xml

poor man's xml parser :)

Insert commas to make reading numbers easier in the output of ls

This modifies the output of ls so that the file size has commas every three digits. It makes room for the commas by destructively eating any characters to the left of the size, which is probably okay since that's just the "group". Note that I did not write this, I merely cleaned it up and shortened it with extended regular expressions. The original shell script, entitled "sl", came with this description: : ' : For tired eyes (sigh), do an ls -lF plus whatever other flags you give : but expand the file size with commas every 3 digits. Really helps me : distinguish megabytes from hundreds of kbytes... : : Corey Satten, corey@cac.washington.edu, 11/8/89 : ' Of course, some may suggest that fancy new "human friendly" options, like "ls -Shrl", have made Corey's script obsolete. They are probably right. Yet, at times, still I find it handy. The new-fangled "human-readable" numbers can be annoying when I have to glance at the letter at the end to figure out what order of magnitude is even being talked about. (There's a big difference between 386M and 386P!). But with this nifty script, the number itself acts like a histogram, a quick visual indicator of "bigness" for tired eyes. :-)

Collect a lot of icons from /usr/share/icons (may overwrite some, and complain a bit)

Today I needed to choose an icon for an app. My simpler way: put all of /usr/share/icons in myicons folder and brows'em with nautilus. Then rm -r 'ed the entire dir.

List .log files open by a pid

Uses lsof to display the full path of ".log" files opened by a specified PID.

Draw a Sierpinski triangle

OK, not the most useful but a good way to impress friends. Requires the "display" command from ImageMagick.

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