Commands tagged bash sorted by votes

Commands tagged bash (821)

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cat /etc/passwd | egrep -v "noshell|false|nologin" | cut -d: -f1,7

List usernames & their assigned shell. If their home directory is in /home and excepting those account that have their login shell set to: noshell, false, nologin Show Sample Output
This is sample output - yours may be different.
```
spool:/bin/bash
sshd:/bin/bash
fantasti:/usr/local/cpanel/bin/jailshell
munin:/bin/bash
```
0

Get a list of user accounts and their login shell

jtypical · 2011-10-19 05:31:21 3
Unmount all CIFS drives

Unmounts all CIFS-based network drives. Very nice for shutting down network mounts on a Linux laptop just prior to going to sleep. Show Sample Output
This is sample output - yours may be different.
```
UNMOUNTING /home/danf/gmounts/G... [DONE]
UNMOUNTING /home/danf/gmounts/H... [DONE]
UNMOUNTING /home/danf/gmounts/N... [DONE]
```
0

for D in `mount -lt cifs | sed 's/.*on $\/.\+$ type.*/\1/'`; do echo -n "UNMOUNTING $D..."; sudo umount $D; echo " [DONE]"; done;

crazedsanity · 2011-10-19 18:14:19 4
Create a false directory structure for testing your commands

You could avoid xargs and sed in this case (shorter command and less forking): At least bash and zsh have some mighty string modifiers. I would also suggest using find with exec option to get more flexibility. You may leave out or include "special" file for example.
This is sample output - yours may be different.
0

for i in /usr/bin/* ;do touch ${i##*/}; done

_john · 2011-10-20 12:38:45 3
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 3
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
Get the name or user running the process of specified PID

Gets the current system user running a process with the specified pid Show Sample Output
This is sample output - yours may be different.
```
nssy@yoda:~$ ps aux | grep 3698 | grep -v 'grep' | awk '{ print $1 }'
nssy
```
0

ps aux | grep PID | grep -v 'grep' | awk '{ print $1 }'

nssy · 2011-11-05 04:53:29 3
Remove the first and the latest caracter of a string

Just an other solution :)
This is sample output - yours may be different.
0

echo foobar | sed -r 's/(^.|.$)//g'

ebraminio · 2011-11-19 16:19:07 3
Get the name or user running the process of specified PID
This is sample output - yours may be different.
0

ps -p pid -o logname |tail -1

grep · 2011-11-21 01:33:02 3
Remove dashes in UUID

Remove the dashes from a UUID using bash search and replace. Show Sample Output
This is sample output - yours may be different.
```
63b726a04c5945e4af65bced5d268456
```
0

UUID="63b726a0-4c59-45e4-af65-bced5d268456"; echo ${UUID//-/}

flatcap · 2011-11-22 22:49:30 103

Show demo of toilet fonts

Demos figlet/toilet fonts in a configurable dir. Show Sample Output

for i in ${TOILET_FONT_PATH:=/usr/share/figlet}/*.{t,f}lf; do j=${i##*/}; toilet -d "${i%/*}" -f "$j" "${j%.*}"; done

trevorj · 2011-12-27 00:49:42 3

Remove color codes (special characters) with sed

Remove ANSI colors from stream or file
This is sample output - yours may be different.
0

sed -r 's/'$(echo -e "\033")'\[[0-9]{1,2}(;([0-9]{1,2})?)?[mK]//g'

frntn · 2012-01-04 20:57:09 5
Delimiter Hunting

Search in decimal rather than hex. od dumps the character list, cut to remove offsets, sort -u gives the used characters. seq gives the comparison list, but we need this sorted alphabetically for comm, which does the filtering. I drop to perl to convert back to characters (is there a better way?) and then use od to dump them in a print-safe format. Show Sample Output
This is sample output - yours may be different.
```
0000000  \0 001  \n   j   k  \v  \f   z   {   |   }   ~ 177  \r 016 017
0000020 020 021 022 023 002 024 025 026 027 030 031 032 033 034 035 003
0000040 036 037       !   "   #   $   %   &   ' 004   (   )   *   +   ,
0000060   -   .   /   0   1 005   2   3   4   5   6   7   8   9   :   ;
0000100 006   <   =   >   ?   @   A   B   C   D   E  \a   F   G   H   I
0000120   J   K   L   M   N   O  \b   P   Q   R   S   T   U   V   W   X
0000140   Y  \t   Z   [   \   ]   ^   _   `   a   b   c
0000154
```
0

comm -13 <(od -vw1 -tu1 dummy.txt|cut -c9-|sort -u) <(seq 0 127|sort)|perl -pe '$_=chr($_)'|od -c

bazzargh · 2012-01-09 01:32:20 7
Remove a range of lines from a file

Delete range of lines. Ex: Line 6 through 66 in .
This is sample output - yours may be different.
0

sed -i 6,66d <filename>

icsamples · 2012-02-04 02:29:40 3
before writing a new script

or add this line to your ~/.vimrc if using vim
This is sample output - yours may be different.
0

:autocmd BufNewFile *.sh,*.bash 0put =\"#!/bin/bash\<nl># -*- coding: UTF8 -*-\<nl>\<nl>\"|$

jlaunay · 2012-02-06 08:28:05 26
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 3
Have your sound card call out elapsed time.

works the same, but uses festival instead of espeak
This is sample output - yours may be different.
0

for ((x=0;;x+=5)); do sleep 5; echo $x | festival --tts & done

mrklaw · 2012-03-06 21:17:51 4
Have your sound card call out elapsed time.

Says time every 5 seconds in hours, minutes and seconds using festival.
This is sample output - yours may be different.
0

for ((x=0;;x+=5)); do sleep 5; hours=$(($x/3600)); minutes=$(($x%3600/60)); seconds=$(($x%60)); echo "$hours hours $minutes minutes $seconds seconds have elapsed" | festival --tts & done

mrklaw · 2012-03-06 22:58:43 3
Print all words in a file sorted by length

Take a file and ,."()?!;: give a list of all the words in order of increasing length. First of all use tr to map all alphabetic characters to lower case and also strip out any puntuation. A-Z become a-z ,."()?!;: all become \n (newline) I've ignored - (hyphen) and ' (apostrophe) because they occur in words. Next use bash to print the length ${#w} and the word Finally sort the list numerically (sort -n) and remove any duplicates (sort -u). Note: sort -nu performs strangely on this list. It outputs one word per length. Show Sample Output
This is sample output - yours may be different.
```
...
9 suggested
9 unsightly
10 advantages
10 categorise
10 considered
10 everything
12 experimental
12 grandparents
13 insignificant
13 self-assembly
14 apologetically
```
0

for w in $(tr 'A-Z ,."()?!;:' 'a-z\n' < sample.txt); do echo ${#w} $w; done | sort -u | sort -n

flatcap · 2012-03-15 14:14:11 5
Show git branches by date - useful for showing active branches

Simpler and without all of the coloring gimmicks. This just returns a list of branches with the most recent first. This should be useful for cleaning your remotes. Show Sample Output
This is sample output - yours may be different.
```
master
testing
this-shit-works
```
0

for k in $(git branch | sed /\*/d); do echo "$(git log -1 --pretty=format:"%ct" $k) $k"; done | sort -r | awk '{print $2}'

dahuie · 2012-04-07 11:19:00 6
Pretend your shell is MS-DOS command.com

(This may be specific to bash only.) This transforms the current working directory to all uppercase characters and replaces forward slashes with backslashes, prepending the string with "C:" and appending a single ">". It serves no practical purpose, but may serve as a great practical joke if you can insert it to some victim's .bashrc :-) Show Sample Output
This is sample output - yours may be different.
```
C:\>pwd
/
C:\>
```
0

export PROMPT_COMMAND=$PROMPT_COMMAND'; export PWD_UPCASE="${PWD^^}"'; export PS1='C:${PWD_UPCASE//\\//\\\\}>'

chungy · 2012-04-30 20:09:49 3
Get the date for the last Saturday of a given month

Choosing your year and month. You only need the gnu date command and bash. desiredDay of the week is (1..7); 1 is Monday. If you want desiredDay of week (0..6); 0 is Sunday desiredDay=6; year=2012; month=5; n=0; while [ $(date -d "$year-$((month+1))-1 - $n day" "+%w") -ne $desiredDay ]; do n=$((n+1)); done; date -d "$year-$((month+1))-1 - $n day" "+%x" Show Sample Output
This is sample output - yours may be different.
```
05/26/2012
```
0

desiredDay=6; year=2012; month=5; n=0; while [ $(date -d "$year-$((month+1))-1 - $n day" "+%u") -ne $desiredDay ]; do n=$((n+1)); done; date -d "$year-$((month+1))-1 - $n day" "+%x"

ClashTheBunny · 2012-05-17 12:02:30 3
recursively change file name from uppercase to lowercase (or viceversa)

Handles spaces in file names and directories. Optionally change directories as well by pipe to tr from dirname.
This is sample output - yours may be different.
0

find ./ -type f -exec sh -c 'echo "{}" "$(dirname "{}")/$(basename "{}" | tr "[A-Z]" "[a-z]")"' \;

jelloir · 2012-06-14 07:13:42 3
Tracing shell scripts with time stamps

Enable tracing and print a timestamp before the command to be invoked. Original author: Peter Eisentraut http://petereisentraut.blogspot.com/2012/07/tracing-shell-scripts-with-time-stamps.html Show Sample Output
This is sample output - yours may be different.
```
user@example:~$ echo 'hello' && echo 'world!'
+13:09:15 echo hello
hello
+13:09:15 echo 'world!'
world!
```
0

set -x && PS4='+\t '

em · 2012-07-19 11:13:47 6
enable all bash completions in gentoo
This is sample output - yours may be different.
0

eselect bashcomp enable --global $(eselect bashcomp list | sed -e 's/ //g'| cut -d']' -f2 | sed -e 's/\*//'| xargs)

proteusx · 2012-07-20 22:01:08 4
sum and average of requests responses times or sizes in Apache2 access log

Depending on your Apache access log configuration you may have to change the sum+=$11 to previous or next awk token. Beware, usually in access log last token is time of response in microseconds, penultimate token is size of response in bytes. You may use this command line to calculate sum and average of responses sizes. You can also refine the egrep regexp to match specific HTTP requests. Show Sample Output
This is sample output - yours may be different.
```
Tot=134020202(15201)
Avg=8816.54
```
0

egrep '.*(("STATUS)|("HEAD)).*' http_access.2012.07.18.log | awk '{sum+=$11; ++n} END {print "Tot="sum"("n")";print "Avg="sum/n}'

fanchok · 2012-07-27 12:18:29 3
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Show device drivers and their properties (Windows XP)

Show device drivers and their properties, including digital signatures /si and in table format /fo.

sed /pat/!d without using sed (no RE; limited to shell patterns aka globbing)

POSIX requires this "string truncating" functionality. might as well use it, at least for very small tasks where invoking sed and using RE is overkill.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

sum numbers in the file (or stdin)

add integers from the stdin and print out the result usually, cat /tmp/file | echo $(($(tr '\n' '+')0))

Copy a folder with progress with pv

clear screen, keep prompt at eye-level (faster than clear(1), tput cl, etc.)

this leaves the cursor at the bottom of the terminal screen, where your eyes are. ctrl-l moves it to the top, forcing you to look up.

Benchmark SQL Query

Benchmark a SQL query against MySQL Server. The example runs the query 10 times, and you get the average runtime in the output. To ensure that the query does not get cached, use `RESET QUERY CACHE;` on top in the query file.

See The MAN page for the last command

This works in bash. The "!!:0" limits the argument to man to be only the first word of the last command. "!!:1" would be the second, etc.

Execute multiple commands from history

Assuming that 219,229 and 221 are entries in history, I recall them in a single line for execute multiple commands 219 ifdown wlan0 ... 221 ifup wlan0 ... 229 iwconfig wlan0 mode Managed so the result is execution of # ifdown wlan0 ; iwconfig wlan0 mode Managed ; ifup wlan0

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

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Commands tagged bash (821)

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