Commands tagged function sorted by votes

Commands tagged function (131)

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List bash functions defined in .bash_profile or .bashrc
This is sample output - yours may be different.
0

declare -F | sed 's/^declare -f //'

pipping · 2009-10-24 16:06:43 5
Easily decode unix-time (funtion)
This is sample output - yours may be different.
0

utime(){ awk -v d=$1 'BEGIN{print strftime("%a %b %d %H:%M:%S %Y", d)}'; }

4Aiur · 2010-05-14 08:00:04 4
Load "missing" man pages for your stuff.

Prepends paths containing man directories to your MANPATH variable for the given top level directory. If you build or install software with non-standard documentation locations, you can just add them to your MANPATH with this little function. -xdev prevents crossing filesystem boundaries when searching for man dirs. Show Sample Output
This is sample output - yours may be different.
```
$ man -w scrub
No manual entry for scrub

$ addman /usr/local/scrub

$ man -w scrub
/usr/local/scrub/man/man1/scrub.1
```
0

addman () { export MANPATH=`find $1 -xdev -type d -name man -printf %p:`${MANPATH}; }

zoomgarden · 2010-06-12 17:47:20 5
Define dettaching commands in bashrc

Define commands that you always invoke with an appended '&disown'. In the example: gvim foo.txt will open gvim dettached from the current terminal.
This is sample output - yours may be different.
0

__disown(){ local cmd=$1 ; shift ; $cmd "$@" &> /dev/null &disown }; for i in gvim ; do alias $i="__disown $i"; done

smolav · 2010-07-07 20:46:45 6
View the newest xkcd comic.

This function displays the latest comic from xkcd.com. One of the best things about xkcd is the title text when you hover over the comic, so this function also displays that after you close the comic. To get a random xkcd comic use the following: xkcdrandom() { wget -qO- http://dynamic.xkcd.com/comic/random | sed -n 's#^<img src="$http://imgs.[^"]\+$"\s\+title="$.\+\?$"\salt.\+$#eog "\1"\necho '"'\2'#p" | bash; } These are just a bit shorter than the ones eigthmillion wrote, however his version didn't work as expected on my laptop for some reason (I got the title-tag first), so these build a command which is executed by bash.
This is sample output - yours may be different.
0

xkcd() { wget -qO- http://xkcd.com/ | sed -n 's#^<img src="$http://imgs.[^"]\+$"\s\+title="$.\+\?$"\salt.\+$#eog "\1"\necho '"'\2'#p" | bash ; }

John_W · 2010-08-25 15:44:31 7
Backup a file with a date-time stamp

"infix" version in bash (4.x+) Remove -v to make it silent. BTW: The OP forgot to use "cat" and "nmap" ;-) I had a good laugh though. Show Sample Output
This is sample output - yours may be different.
```
$ buf a.txt
`a.txt' -> `a-20101215_104638.txt'
$ buf a.txt.gz
`a.txt.gz' -> `a-20101215_104647.txt.gz'
```
0

buf() { f=${1%%.*};e=${1/$f/};cp -v $1 $f-$(date +"%Y%m%d_%H%M%S")$e;}

unefunge · 2010-12-15 09:50:04 4
Backup a file with a date-time stamp

even shorter (infix) version. Show Sample Output
This is sample output - yours may be different.
```
$ buf() { cp -v $1 ${1/${1%%.*}/$f-$(date +"%Y%m%d_%H%M%S")};}
$ buf a.txt
`a.txt' -> `a-20101215_131256.txt'
$ buf a.txt.gz
`a.txt.gz' -> `a-20101215_131305.txt.gz'
```
0

buf() { cp -v $1 ${1/${1%%.*}/$f-$(date +"%Y%m%d_%H%M%S")};}

unefunge · 2010-12-15 12:16:03 4
xpath function

This function uses xmllint to evaluate xpaths. Usage: xpath /some/xpath XMLfile Show Sample Output
This is sample output - yours may be different.
```
$ xpath "//head/title" index.html
<title>All commands | commandlinefu.com</title>
```
0

xpath () { xmllint --format --shell "$2" <<< "cat $1" | sed '/^\/ >/d' }

sharfah · 2011-10-05 07:45:16 15
Command line calculator

use python as calculator, press ctrl+d to exit reminder: when doing factions add atleast one decimal number like so 22.0/7 or 22/7.0 Show Sample Output
This is sample output - yours may be different.
```
$ calc
>>> 22.0/7
3.1428571428571428
>>> 22/7.0
3.1428571428571428
>>> 
```
0

alias calc='python -ic "from math import *; from random import *"'

Bonster · 2011-10-24 08:15:41 4
new ssl key and csr based on a previous ssl certificate

regenerateCSR original.crt new.key new.csr Show Sample Output
This is sample output - yours may be different.
```
regenerateCSR original.crt new.key new.csr
Generating RSA private key, 2048 bit long modulus
.....+++
......+++
e is 65537 (0x10001)
Getting request Private Key
Generating certificate request
```
0

regenerateCSR () { openssl genrsa -out $2 2048; openssl x509 -x509toreq -in $1 -out $3 -signkey $2; }

mrnetops · 2012-02-17 02:45:26 4
List files under current directory, ignoring repository copies.

Ever done a find to get content and been messed up by .git, .svn, .hg or the like spamming your results? Did you really want to grep over every copy of the file that existed in your git history? Replace: grep -r PATTERN . with: grep PATTERN -- $(have_here) or if you really have too many files to put in one argv: have_here | xargs grep PATTERN --
This is sample output - yours may be different.
0

function have_here { find "${@:-.}" -type d $ -name .git -o -name .svn -o -name .bzr -o -name CVS -o -name .hg -o -name __pycache__ $ -prune -o -type f -print; }

syscomet · 2012-05-20 05:31:26 4
Autocomplete directories (CWDs) of other ZSH processes

It gives a 'xcd' command for changing directory to one of CWDs of other ZSH processes (typically running in a terminal emulator). Useful for single-windowed terminal emulators like XTerm or Rxvt which don't have ability to pass CWD of one shell to another. Show Sample Output
This is sample output - yours may be different.
```
$ xcd<TAB>
/home/artur                   /proc
/home/artur/Projects          /usr/src/vim  
```
0

function _xterm_cwds() { for pid in $(pidof -- -zsh) $(pidof zsh); do reply+=$(readlink /proc/$pid/cwd) done }; function xcd() { cd $1 }; compctl -K _xterm_cwds xcd

aartur · 2012-07-12 19:59:46 5
Do Google search from the shell, opening into Chromium or a new Firefox tab if not installed.

Support several arguments. Show Sample Output
This is sample output - yours may be different.
```
$ google 
Usage: google "[seach term]"
$ google test
Created new window in existing browser session.
```
0

google() { gg="https://www.google.com/search?q=";q="";if [[ $1 ]]; then for arg in "$@" ; do q="$q+$arg"; done ; if [[ -f /usr/bin/chromium ]]; then chromium "$gg"$q; else firefox -new-tab "$gg"$q; fi else echo 'Usage: google "[seach term]"'; fi }

LenuX · 2013-08-08 14:34:09 8
Opens an explorer.exe file browser window for the current working directory

use the shell default positional parameter syntax ${X:-default} in lieu of testing.
This is sample output - yours may be different.
0

open() { explorer /e, $(cygpath -wap "${1:-$PWD}"); }

applemcg · 2013-08-08 14:49:15 7
Create a database with user and pass without hassle.

Put this into your ~/.bashrc to create a database for mysql with a user and password. Usage: createdb `database` `datbase-user` `database-password`.
This is sample output - yours may be different.
0

function createdb () { mysqladmin -u root -p create $1 && mysql -u root -p -e "GRANT ALL ON $1.* TO '$2'@'localhost' IDENTIFIED BY '$3';" ; }

thanosme · 2013-08-18 00:34:37 12
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 11
Define a quick calculator function

Same functionality without using bash functions. Show Sample Output
This is sample output - yours may be different.
```
$ ? 3+4/2
5
```
0

alias ?=concalc

boynux · 2014-01-02 01:46:44 10
Opens an explorer.exe file browser window for the current working directory or specified dir (Fixed)

What's wrong with this? Show Sample Output
This is sample output - yours may be different.
```
[1] 4076
```
0

explorer . &

rmsh · 2014-06-08 10:16:04 8
A function to find a file in the pwd downwards

A simple bash function to the find command. I use this much more than find itself. Show Sample Output
This is sample output - yours may be different.
```
$ fn resume
./Documents/2013/My Resume 2014.pdf
```
0

fn() { find . -iname "*$1*" -print; }

suprjami · 2014-07-15 05:30:59 8
Check if a port is open to the internet using canyouseeme.org

For now just returns either "Success" or "Error". My awk-fu isn't strong enough to hackily parse out the error in case there is one, so I kept it simple. Show Sample Output
This is sample output - yours may be different.
```
~ user@host
&#10095; cysm 80
Success

~ user@host
&#10095; cysm 443
Error
```
0

cysm() { curl -sd port="$1" http://canyouseeme.org |grep -o 'Success\|Error' }

awh · 2014-11-11 23:30:39 51
Don't track history for the current session starting after the command

Yo run the `nohist` command and after that the commands won't get stored in the history file for the current session. This makes no permanent changes.
This is sample output - yours may be different.
0

nohist(){ export HISTFILE=/dev/null; }

ivanalejandro0 · 2014-12-31 22:30:08 11
Print a cron formatted time for 2 minutes in the future (for crontab testing)

usage = crontest "/path/to/bin" This version of this function will echo back the entire command so it can be copied/pasted to crontab. Should be able to be automagically appended to crontab with a bit more work. Tested on bash and zsh on linux,freebsd,aix Show Sample Output
This is sample output - yours may be different.
```
49 15 12 03 *   /path/to/bin
```
0

crontest () { date +'%M %k %d %m *' |awk 'BEGIN {ORS="\t"} {print $1+2,$2,$3,$4,$5,$6}'; echo $1;}

CoolHand · 2015-03-12 19:56:56 11
Search for a process by name

I like this method because I can make use of pgrep which also has the -f flag that can use regex to match patterns in the full command line string. It will also do ps -fww on all pids returned by pgrep, providing a list of process matching the regex provided. Show Sample Output
This is sample output - yours may be different.
```
UID        PID  PPID  C STIME TTY          TIME CMD
ntp      24062     1  0 Apr21 ?        00:00:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -g
```
0

ps -fwwp $(pgrep process_name)

acesaro · 2015-04-23 13:29:57 9
Reports file systems with disk usage exceeding 90% on the specified host
This is sample output - yours may be different.
0

function df_func { local dfts=$(ssh $1 "df -lP | tail -n +2 | sed 's/%//'"); echo $dfts | awk '$5 > 90 {exit 1}' > /dev/null; if [ $? == 1 ]; then echo -n "$1 "; echo $dfts | awk '$5 > 90 {printf "%s %d%%\n", $6, $5}'; fi }

wytten12 · 2016-03-30 19:57:39 10
Print hex codes of a given string

Prints a string as a sequence of hexadecimal values. Output comes in space separated pairs, regardless of ASCII or Unicode characters Show Sample Output
This is sample output - yours may be different.
```
$ hexstring commandlinefu
63 6f 6d 6d 61 6e 64 6c 69 6e 65 66 75
```
0

hexstring () { perl -p -e 's/(.)/sprintf("%02x", ord($1))/eg' << $1 }

hellcode · 2016-05-03 22:44:24 10
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Generate random valid mac addresses

Doubt it actually generates valid mac addresses but this version doesn't need any external commands so it runs much faster. Much shorter as well.

How to run a command on a list of remote servers read from a file

The important thing to note in this command, is the "-n" flag.

Rename files in batch

Sort files in folders alphabetically

Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

convert single digit to double digits

Uses 'rename' to pad zeros in front of first existing number in each filename. The "--" is not required, but it will prevent errors on filenames which start with "-". You can change the "2d" to any number you want, equaling the total numeric output: aka, 4d = ????, 8d = ????????, etc. I setup a handful of handy functions to this effect (because I couldn't figure out how to insert a var for the value) in the form of 'padnum?', such as: padnum5 () { /usr/bin/rename 's/\d+/sprintf("%05d",$&)/e' -- $@ } Which would change a file "foo-1.txt" to "foo-00001.txt"

Uncompress a CSS file

Ever compress a file for the web by replacing all newline characters with nothing so it makes one nice big blob? It is a great idea, however what about when you want to edit that file? ...Serious pain in the butt. I ran into this today in that my only copy of a CSS file was "compressed" with no newlines. I whipped this up and it converted back into nice human readable CSS :-) It could be nicer, but it does the job.

Create a favicon

Create a favicon suitable for use on your web site. Note: ppmtowinicon is part of libpbm, not ImageMagick.

Swap a file or dir with quick resotre

This lets you replace a file or directory and quickly revert if something goes wrong. For example, the current version of a website's files are in public_html. Put a new version of the site in public_html~ and execute the command. The names are swapped. If anything goes wrong, execute it again (up arrow or !!).

Waste time for about 3 minutes

If you're a slow reader and/or you like to ponder, adjust the sleep time to be longer

Alternative for basename using grep to extract file name

Here's a bash version.

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Commands tagged function (131)

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