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get biggest directories
This is sample output - yours may be different.
0

du -kh --max-depth=1 | sort -n |head

cyberion11 · 2011-04-26 13:32:21 24
Check variable has been set

Got the idea from there http://fixunix.com/questions/15902-bash-checking-if-env-var-set.html Show Sample Output
This is sample output - yours may be different.
```
$ isdef a_var; echo $?
1
$ a_var=1
$ isdef a_var; echo $?
0
```
0

isdef() { eval test -n \"\${$1+1}\"; }

keymon · 2011-09-29 15:39:51 3
Print heap addresses and size

Show Sample Output
This is sample output - yours may be different.
```
00014000-00174000 rwxp 00000000 00:00 0    [heap]
Size:    1408 kB
Rss:     1292 kB
```
0

PID=`ps | grep process_name | grep -v grep | head -n 1 | awk '{print $1}'`; cat /proc/$PID/smaps | grep heap -A 2

yohananov · 2012-01-30 13:31:40 3
Recursively sort files by modification time through multiple directories.
This is sample output - yours may be different.
0

find /test -type f -printf "%AY%Aj%AH%AM%AS---%h/%f\n" | sort -n

omatictost · 2012-10-25 16:22:48 4
Order all files oldest to newest then get the last one touched

On the Mac, the 'ls' function can sort based on month/day/time, but seems to lack ability to filter on the Year field (#9 among the long listed fields). The sorted list continuously increases the 'START' year for the most recently accessed set of files. The final month printed will be the highest month that appeared in that START year. The command does its magic on the current directory, and suitably discards all entries that are themselves directories. If you expect files dating prior to 2002, change the START year accordingly.
This is sample output - yours may be different.
0

ls -lT -rt | grep "^-" | awk 'BEGIN {START=2002} (START <= $9){ print $10 ;START=$9 }' | tail -1

Glamdring · 2013-02-24 23:39:22 7
Get the Nth argument of the last command in $HISTFILE

This gets the Nth argument in the last line of your history file. This is useful where history is being written after each command, and you want to use arguments from the previous command in the current command, such as when doing copies/moving directories etc. I wrote this after getting irritated with having to continually type in long paths/arguments. You could also use $_ if all you want is the last argument. Show Sample Output
This is sample output - yours may be different.
```
$ echo "This little piggy went to the market"
This little piggy went to the market
$ garg 5
went
```
0

function garg () { tail -n 1 ${HISTFILE} | awk "{ print \$$1 }" }

plasticphyte · 2013-09-10 04:07:46 10
one liner to rename files with for and sed

If you want to test output, run it like this: for fn in *.epub; do echo mv \"$fn\" \"`echo "$fn" | sed -E 's/\.*\/*(.*)( - )(.*)(\.[^\.]+)$/\3\2\1\4/' | sed -E 's/(.*) ([^ ]+)( - )(.*)/\2, \1\3\4/' `\";done > rename.txt Show Sample Output
This is sample output - yours may be different.
```
Input filename: The Big Wave - Pearl S. Buck.epub
Output: Buck, Pearl S. - The Big Wave.epub
```
0

for fn in *.epub; do echo mv \"$fn\" \"`echo "$fn" | sed -E 's/\.*\/*(.*)( - )(.*)(\.[^\.]+)$/\3\2\1\4/' | sed -E 's/(.*) ([^ ]+)( - )(.*)/\2, \1\3\4/' `\";done | sh

woohoo · 2013-11-30 05:29:52 6
Find directories in pwd, get disk usage, sort results
This is sample output - yours may be different.
0

du -a | sort -nr | head -10

compguy925 · 2014-06-10 13:00:27 8
drop first column of output by piping to this

drop first column with perl "$#F" means a index of last column(start from 0). One can easily handle range of columns like "[3..6]"
This is sample output - yours may be different.
0

perl -anE'say join "\t",@F[1..$#F]'

pung96 · 2015-05-09 15:11:23 9
Restart Plasma without logging off from KDE

This can help with serious GUI lockups in KDE. It will only restart Plasma + widgets, not your session, so all your programs will stay running.
This is sample output - yours may be different.
0

pkill plasma-desktop && plasma-desktop

lordtoran · 2015-09-28 23:36:24 12
Play Lisp Tetris in Emacs
This is sample output - yours may be different.
0

emacs -f tetris

steadystatic · 2015-11-03 23:35:32 10
Get current Xorg resolution via xrandr

if there are multiple monitors, this command uses multiple lines Show Sample Output
This is sample output - yours may be different.
```
1280x800
```
0

xrandr | awk '/*/ {print $1}'

misterhat · 2015-12-21 15:29:39 11
Remove all node_module folders recursively

makes sure not to skip children nodemodules credit: https://coderwall.com/p/guqrca/remove-all-node_module-folders-recursively
This is sample output - yours may be different.
0

find . -name "node_modules" -type d -prune -exec rm -rf '{}' +

ctcrnitv · 2018-02-10 04:23:36 22
conver mp3 to m4b
This is sample output - yours may be different.
0

mpg123 -s input.mp3 | faac -P -X -w -o output.m4b -

schmiddim · 2010-03-06 11:28:19 3
get value after comma from an arithmetic operation

scale define the number you want after comma Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:~$ echo "scale=6;2048 / 2.345" | bc
873.347547
```
0

echo "scale=6;2048 / 2.345" | bc

eastwind · 2010-04-05 12:06:50 3
Indent all the files in a project using emacs

Use find's exec and reduce the need for multiple evals with a progn wrapper.
This is sample output - yours may be different.
0

find . -iname \*.c -or -iname \*.h -exec emacs -nw -q {} --eval "(progn (mark-whole-buffer) (indent-region (point-min) (point-max) nil) (save-buffer))" --kill \;

zev · 2010-09-10 05:07:11 3
Reading my nic's mac address

plain and simple Show Sample Output
This is sample output - yours may be different.
```
-bash-3.00$ /sbin/ifconfig | grep HWaddr
eth0      Link encap:Ethernet  HWaddr 00:50:56:9C:69:6F
eth1      Link encap:Ethernet  HWaddr 00:50:56:9C:16:C6
-bash-3.00$
```
0

ifconfig | grep HWaddr

phobot · 2011-04-26 15:34:56 3
Merge PDFs into single file
This is sample output - yours may be different.
0

pdftk input1.pdf input2.pdf cat output output.pdf

shanti · 2011-07-18 20:42:09 4
Prevent command history file from being overwritten by multiple shell sessions.

Takes effect immediately.
This is sample output - yours may be different.
0

echo "shopt -s histappend" >> ~/.bashrc ; . ~/.bashrc

dhart · 2011-11-03 09:57:18 3
cvs diff HEAD and current branch

you can't reliably use diff against -r HEAD to test whether a file matches the head of the trunk.
This is sample output - yours may be different.
0

cvs up -pA main.cpp | sdiff -s - main.cpp

kev · 2011-12-14 04:51:40 4
Print heap addresses and size

Show Sample Output
This is sample output - yours may be different.
```
b81db000-b81dc000 ---p 00000000 00:00 0          [heap]
Size:                  4 kB
Rss:                   0 kB
--
b81dc000-b81fb000 rw-p 00000000 00:00 0          [heap]
Size:                124 kB
Rss:                   4 kB
--
```
0

PID=`pgrep -o <process_name>`; grep -A 2 heap /proc/$PID/smaps

deimos · 2012-01-30 14:28:54 3
Create a file

Create empty file
This is sample output - yours may be different.
0

> filename

TIT · 2012-03-08 23:17:05 3
Create rsyncable tar archives with gzip compression
This is sample output - yours may be different.
0

GZIP="--rsyncable" tar -czf something.tgz /something

dash · 2012-04-24 19:06:56 4
Directory stack pushd popd dirs

manage directory stack Show Sample Output
This is sample output - yours may be different.
```
# cd /tmp/dir1
# pushd .
# cd /tmp/dir2
# pushd .
# cd /tmp/dir3
# pushd .
# cd /tmp/dir4
# pushd .
# dirs
/tmp/dir4 /tmp/dir4 /tmp/dir3 /tmp/dir2 /tmp/dir1
```
0

pushd path/to/dir/

ankush108 · 2012-06-26 17:23:55 6
Macports update and clean all packages
This is sample output - yours may be different.
0

sudo port selfupdate && sudo port upgrade outdated && sudo port clean --all installed && sudo port -f uninstall inactive

noah · 2013-06-26 01:12:33 10
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FAST Search and Replace for Strings in all Files in Directory

I needed a way to search all files in a web directory that contained a certain string, and replace that string with another string. In the example, I am searching for "askapache" and replacing that string with "htaccess". I wanted this to happen as a cron job, and it was important that this happened as fast as possible while at the same time not hogging the CPU since the machine is a server. So this script uses the nice command to run the sh shell with the command, which makes the whole thing run with priority 19, meaning it won't hog CPU processing. And the -P5 option to the xargs command means it will run 5 separate grep and sed processes simultaneously, so this is much much faster than running a single grep or sed. You may want to do -P0 which is unlimited if you aren't worried about too many processes or if you don't have to deal with process killers in the bg. Also, the -m1 command to grep means stop grepping this file for matches after the first match, which also saves time.

Mount a temporary ram partition

Makes a partition in ram which is useful if you need a temporary working space as read/write access is fast. Be aware that anything saved in this partition will be gone after your computer is turned off.

Fibonacci With Case

Returns the '$1'th Fibonacci number.

Show total disk space on all partitions

show off how big your disks are

Echo the latest commands from commandlinefu on the console

Self-referential use of wget.

Alias for quick command-line volume set (works also remotely via SSH)

If you're addicted to command-line solutions of ordinary actions or if you just want to set your volume from bed via mobile phone SSH, you can set this alias and use it as $ setvol 50 for setting volume on 50% gain Works only with ALSA, tested on Ubuntu 8.10. Give me some info about your experience. TIP: Try aslo command "mute" to toggle mute/unmute sound. But I don't know if this works on all distros.

Docker: Remove all exited docker container

Quick command line math

expr will give you a quick way to do basic math from the CLI. Make sure you escape things like * and leave a space between operators and digits.

prevent accidents and test your command with echo

if you're using wildcards * or ? in your command, and if you're deleting, moving multiple files, it's always safe to see how those wildcards will expand. if you put "echo" in front of your command, the expanded form of your command will be printed. It's better safe than sorry.

dd with progress bar and remaining time displayed

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