Commands tagged bash sorted by votes

Commands tagged bash (821)

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Find large files in current directory

This is for bash - make an alias - also a good blueprint for making aliases that take arguments to functions. If for Solaris use "-size +${1}000000c" to replace "-size +${1}M" Show Sample Output
This is sample output - yours may be different.
```
$ big 100
1428749   524288 -rw-------    1 user staff    268435456 Mar  1 09:53 ./Desktop/centos-5.5-2.6.4/564d24cb-9632-8f69-724d-15622e3b68fc.vmem
1427799  2065664 -rw-r--r--    1 user staff    1057619968 Mar  9 22:30 ./Desktop/centos-5.5-2.6.4/CentOS-min-s001.vmdk
1427808  2334464 -rw-r--r--    1 user staff    1195245568 Mar  9 22:30 ./Desktop/centos-5.5-2.6.4/CentOS-min-s002.vmdk
...
```
0

alias big='BIG () { find . -size +${1}M -ls; }; BIG $1'

greggster · 2011-03-10 06:33:00 6
Create a tar of modified/added files since revision 1792.

The result of this command is a tar with all files that have been modified/added since revision 1792 until HEAD. This command is super useful for incremental releases.
This is sample output - yours may be different.
0

svn diff -r 1792:HEAD --summarize | awk '{if ($1 != "D") print $2}'| xargs -I {} tar rf incremental_release.tar {}

windfold · 2011-04-05 15:00:49 3
cd to (or operate on) a file across parallel directories

ksh's version of cd has an optional syntax where you can type "cd old new" and it will replace "old" with "new" in your current directory and take you there. This is very handy when you have a parallel directory structure, like source and object directories. As suggested, you can just type cd ${PWD/old/new} to get this in bash, but this function in your .bashrc will let you type the ksh cd syntax and avoid typing the special characters while preserving other cd functionality. Show Sample Output
This is sample output - yours may be different.
```
splante@guinness:/tmp/src/x/y/z/> cd src obj
splante@guinness:/tmp/obj/x/y/z/> cd obj src
splante@guinness:/tmp/src/x/y/z/> 
```
0

cd () { cdop=""; while [ "$1" != "${1#-}" ]; do cdop="${cdop} ${1}"; shift; done; if [ $# -eq 2 ]; then newdir="${PWD/$1/$2}"; [ -d "${newdir}" ] || { echo "no ${newdir}"; return 1; }; builtin cd $cdop "${newdir}"; else builtin cd $cdop "$@"; fi }

splante · 2011-04-07 14:36:26 3
redirecting stdout of multiple commands

{ ... } vs ( ... ) reduces the process count, I believe. Typically, I use this logic to redirect a series of commands to a pipe -- { command1 args1 ; command2 args2}|less -- or file -- { command1 args1 ; command2 args2}>foo -- or to spawn the series as a background process -- { ... } & .
This is sample output - yours may be different.
0

{ command1 args1 ; command2 args2 ; ... }

IF_Rock · 2011-04-12 20:01:51 3
Quick and dirty version control for one file

Bash function copies a file prefixed with a version number to a subdirectory Show Sample Output
This is sample output - yours may be different.
```
file.svg
file.svg_versions/v01_file.svg
file.svg_versions/v02_file.svg
```
0

v () { ( IFS=$'\n'; suf="_versions"; mkdir -p "$1$suf"; nr=`ls "$1$suf" | wc -l`; nr=`printf "%02d" $(($nr + 1))`; cp "$1" "$1$suf/v${nr}_$1" ) }

dubnov · 2011-04-22 07:33:51 3
un-escape URL/URIs with Ruby
This is sample output - yours may be different.
0

echo 'example.com%2Fsome%2Fpath' | ruby -r'cgi' -e 'puts CGI.unescape(STDIN.read)'

slippyd · 2011-04-26 03:13:22 3
Create cheap and easy index.html file

Just to avoid link to itself
This is sample output - yours may be different.
0

F=index.html; for i in *; do [[ $i = $F ]] && continue; echo "<li><a href='$i'>$i</a>"; done >$F

frans · 2011-05-08 20:57:24 5
What happened on this day in history?

Improved version of command #8425. This way, the default browser is used, as opposed to Firefox.
This is sample output - yours may be different.
0

www-browser http://en.wikipedia.org/wiki/$(date +'%b_%d')

benjabean1 · 2011-05-09 02:42:32 3
Show seconds since modified of newest modified file in directory
This is sample output - yours may be different.
0

FILE=`ls -ltr /var/lib/pgsql/backups/daily/ | tail -n1 | awk '{print $NF}'`; TIME=`stat -c %Y /var/lib/pgsql/backups/daily/$FILE`; NOW=`date +%s`; echo $((NOW-TIME))

allrightname · 2011-05-12 13:21:37 6
Show seconds since modified of newest modified file in directory
This is sample output - yours may be different.
0

ls -atr /home/reports/*.csv -o --time-sty=+%s | tail -1 | awk '{print systime()-$5}'

MiKatp · 2011-05-12 13:58:56 5
flush stdin in bash
This is sample output - yours may be different.
0

read -t 0.1 -N 255

maurol · 2011-05-19 19:48:42 13
search google on any OS

Inspired by: http://www.commandlinefu.com/commands/view/8744/search-google-on-os-x #!/bin/bash if [ -n "$1" ] then firefox 'http://www.google.com/search?q="'$1'"' else firefox 'http://www.google.com' fi Ive aliased this script as 'google' on my system and I can type 'google "search terms"' to open firefox with my search terms. My first post here, if there are any improvements to be made please let me know in the comments.
This is sample output - yours may be different.
0

google "search terms" #see description for more details

husmanahmed · 2011-07-04 09:37:39 49
monitor the last command run
This is sample output - yours may be different.
0

$ history

naosam · 2011-07-14 17:41:11 3
Overcome Bash's expansion order

In order to create, let's say, 10 directories with a single process we can use the command: mkdir test{1,2,3,4,5,6,7,8,9,10} something extremely boring to type! Why not use seq? seq -s, 1 10 and use its output inside the curly braces? The obvious solution mkdir test{$(seq -s, 1 10)} is, unfortunately, too naive and doesn't work. The answer is the order of the shell expansions (feature of Bourne Shell, actually), where brace expansion happens before command substitution (according to Bash's manual). The solution is to put another level of substitution, using the powerful and mystic command eval. I found the trick in a similar problem in the post at http://stackoverflow.com/questions/6549037/bash-brace-expansion-in-scripts-not-working-due-to-unwanted-escaping
This is sample output - yours may be different.
0

eval "mkdir test{$(seq -s, 1 10)}"

xakon · 2011-07-23 17:09:01 9
Hello world

Pi also says hello world!
This is sample output - yours may be different.
0

pi 62999 | tr 0-9 del\ l\!owrH

maurol · 2011-07-29 22:47:53 4
See how many more processes are allowed, awesome!
This is sample output - yours may be different.
0

echo $(($(ulimit -u)-$(pgrep -u $USER|wc -l))

h3xx · 2011-07-30 05:03:36 3
List only directories, one per line

nothing special Show Sample Output
This is sample output - yours may be different.
```
[root@arch ~]# ls -l | grep ^d | awk '{print $8}'
Desktop
public_html
script
```
0

ls -l | grep ^d | sed 's:.*\ ::g'

bormarek · 2011-08-08 12:36:28 3
Execute the command given by history event number

You can find a command's history event number via the `history` command. You can also put the history event number in your prompt: \! for bash, or %h for zsh. Finally, I would like to point out that by "number", I mean POSITIVE INTEGER. Not, say, a letter, such as 'm'. Examples: !1 or !975 Show Sample Output
This is sample output - yours may be different.
```
$ history | grep 'ipt'
  2    iptables -L -n -v -t nat
$ !2     # will execute the iptables command
```
0

!<number>

dbbolton · 2011-08-18 01:08:57 11
Count files by extension

Change "sort -f" to "sort" and "uniq -ic" to "uniq -c" to make it case sensitive. Show Sample Output
This is sample output - yours may be different.
```
      1 bin
     15 css
      8 gif
      1 html
      1 ico
      6 jpg
     21 js
```
0

find . -type f | sed -n 's/..*\.//p' | sort -f | uniq -ic

tyler_l · 2011-08-19 00:19:43 4
Find all e-mails older than 7 days in the queue and delete them

Find all files in /var/spool/mqueue older than 7 days, pass to perl to efficiently delete them (faster than xargs or -exec when you've got millions or hundreds of thousands to delete). Naturally the type, directory, and file age vars can be adjusted to meet your specific needs.
This is sample output - yours may be different.
0

find /var/spool/mqueue -type f -mtime +7 | perl -lne unlink

mengesb · 2011-08-19 15:22:02 4
OSX Expand URL and Copy to Clipboard

Expand a URL, aka do a head request, and get the URL. Copy this value to clipboard.
This is sample output - yours may be different.
0

function expand_url() { curl -sI $1 | grep Location: | cut -d " " -f 2 | tr -d "\n" | pbcopy }

gt · 2011-08-21 05:30:09 3
Print a bar graph

WIDTHL=10 and WIDTHR=60 are setting the widths of the left and the right column/bar. BAR="12345678" etc. is used to create a 80 char long string of "="s. I didn't know any shorter way. If you want to pipe results into it, wrap the whole thing in ( ... ) I know that printing bar graphs can be done rather easily by other means. Here, I was looking for a Bash only variant. Show Sample Output
This is sample output - yours may be different.
```
$ cat dataset.dat
Irene     10
Karen     37
Andreas   41
Beatrice  23
$ SCALE=1; WIDTHL=10; WIDTHR=60; BAR="12345678"; BAR="${BAR//?/==========}"; while read LEFT RIGHT rest ; do RIGHT=$((RIGHT/SCALE)); printf "%${WIDTHL}s: %-${WIDTHR}s\n" "${LEFT:0:$WIDTHL}" "|${BAR:0:$RIGHT}*"; done < dataset.dat
     Irene: |==========*
     Karen: |=====================================*
   Andreas: |=========================================*
  Beatrice: |=======================*
```
0

SCALE=3; WIDTHL=10; WIDTHR=60; BAR="12345678"; BAR="${BAR//?/==========}"; while read LEFT RIGHT rest ; do RIGHT=$((RIGHT/SCALE)); printf "%${WIDTHL}s: %-${WIDTHR}s\n" "${LEFT:0:$WIDTHL}" "|${BAR:0:$RIGHT}*"; done < dataset.dat

andreasS · 2011-08-22 19:35:21 7
Print without executing the last command that starts with...

Just hold Ctrl-R and start typing a string (e.g. ssh). The shell will search for that string in the command history. Keep pressing Ctrl-R to cycle through all commands matching pattern. This works in other "sub-shells" too, like a python interactive session. Show Sample Output
This is sample output - yours may be different.
```
(reverse-i-search)`ssh': ssh hostname
```
0

^Rssh

never147 · 2011-10-15 21:25:19 5
Makes you look busy

Enhancement for the 'busy' command originally posted by busybee : less chars, no escape issue, and most important it exclude small files ( opening a 5 lines file isn't that persuasive I think ;) ) This makes an alias for a command named 'busy'. The 'busy' command opens a random file in /usr/include to a random line with vim.
This is sample output - yours may be different.
0

alias busy='rnd_file=$(find /usr/include -type f -size +5k | sort -R | head -n 1) && vim +$((RANDOM%$(wc -l $rnd_file | cut -f1 -d" "))) $rnd_file'

frntn · 2011-10-16 00:05:59 3
List all username for accounts using bash shell
This is sample output - yours may be different.
0

cat /etc/passwd | grep "bash" | cut -d: -f1

jtypical · 2011-10-19 05:22:52 3
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route add default gateway

Reduce PDF size

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"

Check if a command is available in your system

Usefull to detect if a commad that your script relies upon is properly installed in your box, you can use it as a function function is_program_installed() { type "$1" >/dev/null } Invoke it and check the execution code is_program_installed "dialog" if [ ! $? -eq 0 ]; then echo "dialog is not installed" exit 1 fi

a function to find the fastest DNS server

http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Get the Volume labels all bitlocker volumes had before being encrypted

Get information of volume labels of bitlocker volumes, even if they are encrypted and locked (no access to filesystem, no password provided). Note that the volume labels can have spaces, but only if you name then before encryption. Renaming a bitlocker partition after being encrypted does not have the same effect as doing it before.

parted - scripted partitioning (of all multipathed SAN LUNs)

`multipath -ll` requires Device Mapper multipath.conf configuration. And of course, replace "3PARdata,VV" with your disk array's SCSI vendor,LUN name. - GPT partition table allows you to create >2TB partitions

find previously entered commands (requires configuring .inputrc)

[Click the "show sample output" link to see how to use this keystroke.] Meta-p is one of my all time most used and most loved features of working at the command line. It's also one that surprisingly few people know about. To use it with bash (actually in any readline application), you'll need to add a couple lines to your .inputrc then have bash reread the .inputrc using the bind command: $ echo '"\en": history-search-forward' >> ~/.inputrc $ echo '"\ep": history-search-backward' >> ~/.inputrc $ bind -f ~/.inputrc I first learned about this feature in tcsh. When I switched over to bash about fifteen years ago, I had assumed I'd prefer ^R to search in reverse. Intuitively ^R seemed better since you could search for an argument instead of a command. I think that, like using a microkernel for the Hurd, it sounded so obviously right fifteen years ago, but that was only because the older way had benefits we hadn't known about. I think many of you who use the command line as much as I do know that we can just be thinking about what results we want and our fingers will start typing the commands needed. I assume it's some sort of parallel processing going on with the linguistic part of the brain. Unfortunately, that parallelism doesn't seem to work (at least for me) with searching the history. I realize I can save myself typing using the history shortly after my fingers have already started "speaking". But, when I hit ^R in Bash, everything I've already typed gets ignored and I have to stop and think again about what I was doing. It's a small bump in the road but it can be annoying, especially for long-time command line users. Usually M-p is exactly what I need to save myself time and trouble. If you use the command line a lot, please give Meta-p a try. You may be surprised how it frees your brain to process more smoothly in parallel. (Or maybe it won't. Post here and let me know either way. ☺)

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

VMware Server print out the state of all registered Virtual Machines.

I use this command on my machines running VMware Server to print out the state of all registered Virtual machines.

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Commands tagged bash (821)

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