Commands tagged bash sorted by votes

Commands tagged bash (821)

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Recursively set the files to ignore in all folders for svn

To use this comment you'll have to create a file entitled 'ignorelist' where you put the file name or pattern of the files you want to ignore. I used it for my maven project which generates the child project files in each folder so I can import them into eclipse. By adding these project files to the ignore list ensure they won't appear each time I run 'svn status'. Show Sample Output
This is sample output - yours may be different.
```
property 'svn:ignore' set on '/home/User/workspace/parentProject'
property 'svn:ignore' set on '/home/User/workspace/parentProject/common'
property 'svn:ignore' set on '/home/User/workspace/parentProject/domain'
property 'svn:ignore' set on '/home/User/workspace/parentProject/integration'
property 'svn:ignore' set on '/home/User/workspace/parentProject/presentation'
property 'svn:ignore' set on '/home/User/workspace/parentProject/services-impl'
property 'svn:ignore' set on '/home/User/workspace/parentProject/services-intf'
property 'svn:ignore' set on '/home/User/workspace/parentProject/webservices
```
0

for folder in $( find $( pwd ) -maxdepth 1 -type d | grep -v .svn ); do svn propset svn:ignore -F ignorelist ${folder}; done

Highwayman · 2012-08-03 13:50:45 15
bash/ksh function: given a file, cd to the directory it lives

Had trouble with the other function, because of missing semicolons. (According to my bash on OS X)
This is sample output - yours may be different.
0

function cdf () { [ -f $1 ] && { cd $(dirname $1); } || { cd $1 ; }; pwd; };

Josso · 2012-09-08 10:50:58 6
Show git branches by date - useful for showing active branches

Add this line to your ~/.gitconfig for a git alias "git brd" (i.e., brd = (br)anch+(d)ate) which sorts branches by date. Allows you to pass in limited "git branch" options such as "-r" (remote) or "-a" (all). (Note: forum added "$" prefix to command; obviously in gitconfig there is no "$" prefix.) Show Sample Output
This is sample output - yours may be different.
```
$ git brd
2012-09-13 06:03:06 -0700 (2 weeks ago) master
2012-08-20 02:32:13 -0700 (6 weeks ago) feature-foo

$ git brd -r
2012-09-13 06:03:06 -0700 (2 weeks ago) origin/feature-foo
2012-09-13 06:03:06 -0700 (2 weeks ago) origin/master
2012-09-13 06:03:06 -0700 (2 weeks ago) origin/HEAD
```
0

brd = "! f() { for k in $(git branch $@ | sed 's/^..//; s/ .*//'); do echo "$(git log -1 --pretty='%Cgreen%ci %Cblue(%cr)%Creset ' $k) $k" ; done | sort -r; }; f"

michael_n_1138 · 2012-09-28 10:20:51 5
Make changes in .bashrc immediately available
This is sample output - yours may be different.
0

. ~/.bashrc

brandizzi · 2012-10-02 17:20:29 4
Massive rename filenames

Renames all files ending in "_test.rb" to "_spec.rb"
This is sample output - yours may be different.
0

for i in `find -name '*_test.rb'` ; do mv $i ${i%%_test.rb}_spec.rb ; done

olopopo · 2012-10-09 14:08:38 4

find geographical location of an ip address

Tries to avoid the fragile nature of scrapers by looking for user-input in the output as opposed to markup or headers on the web site. Show Sample Output

function ip-where { wget -qO- -U Mozilla http://www.ip-adress.com/ip_tracer/$1 | html2text -nobs -style pretty | sed -n /^$1/,/^$/p;}

tox2ik · 2012-10-22 21:39:53 5

Logout ssh user automatically after specified time

This will check if a user is logged in using ssh and will log out the user automatically after the specified time in seconds without data retrieval on the server side. Will work with bash and zsh so put it into your sourced shell file on the server side. Be aware that users can change this themselves as it's just a envoronment variable. Show Sample Output
This is sample output - yours may be different.
```
ssh <host>
...
zsh: timeout
Connection to <host> closed.
```
0

if [ -n "$SSH_CONNECTION" ]; then export TMOUT=300; fi

Testuser_01 · 2012-11-03 18:39:25 7
avoid ssh hangs using jobs

Execute commands serially on a list of hosts. Each ssh connection is made in the background so that if, after five seconds, it hasn't closed, it will be killed and the script will go on to the next system. Maybe there's an easier way to set a timeout in the ssh options...
This is sample output - yours may be different.
0

for host in $MYHOSTS; do ping -q -c3 $H 2>&1 1>/dev/null && ssh -o 'AllowedAuthe ntications publickey' $host 'command1; command2' & for count in 1 2 3 4 5; do sleep 1; jobs | wc -l | grep -q ^0\$ && continue; done; kill %1; done

a8ksh4 · 2012-11-13 23:12:27 5
avoid ssh hangs using jobs

Cleaned up and silent with &>/dev/null at the end. Show Sample Output
This is sample output - yours may be different.
```
Nothing.
```
0

for host in $HOSTNAMES; do ping -q -c3 $host && ssh $host 'command' & for count in {1..15}; do sleep 1; jobs | wc -l | grep -q ^0\$ && continue; done; kill %1; done &>/dev/null

somaddict · 2012-11-16 02:31:27 4
Test against loopback address with the 0.0.0.0 default route.

Super fast way to ftp/telnet/netcat/ssh/ping your loopback address for testing. The default route 0.0.0.0 is simply reduced to 0. Show Sample Output
This is sample output - yours may be different.
```
$ ping 0
PING 0 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.497 ms

$ telnet 0 22
Trying 0.0.0.0...
Connected to 0 (0.0.0.0).
Escape character is '^]'.
SSH-2.0-OpenSSH_4.3
```
0

telnet 0 <port>

somaddict · 2012-11-16 03:38:49 4
Let you vanish in the (bash) history.

hide your ass, buddy.
This is sample output - yours may be different.
0

export HISTSIZE=0

kiiwii · 2012-11-17 14:12:34 5
Use emacs in place of tail -f

Monitoring a log file with 'tail -f' is handy, but for emacs users monitoring the file with emacs is even better, because you can use all your familiar key bindings for copying regions, etc.
This is sample output - yours may be different.
0

function emon { emacs "$1" --eval '(auto-revert-tail-mode)' --eval '(setq buffer-read-only t)' --eval '(goto-char (point-max))' }

wytten12 · 2012-11-21 17:24:27 4
Purge frozen messages in Exim

do 1000 at a time so that if your doodoo is deep you can avoid avoid "command-line too big" error
This is sample output - yours may be different.
0

exipick -zi | xargs --max-args=1000 exim -Mrm

jasen · 2012-12-12 20:46:22 5
Displays mpd playing status in the terminal first raw

Actually this is a shorter version that fits the 255 chars limit of this resource. The full version shows status in the right top corner: alias mpdd='while sleep 1; do _r=$(awk '\''BEGIN{FS=": "}/^Artist:/{r=r""$2};/^Title:/{r=r" - "$2};/^time:/{r=$2" "r};/^state: play/{f=1}END{if(f==1){print r}}'\'' <(mpc status;mpc currentsong));_l=${#_r};[ $_l -eq 0 ] && continue;[ -z "$_p" ] && _p=$_l;echo -ne "\e[s\e[0;${_p}H\e[K\e[u";_p=$((COLUMNS - _l));echo -ne "\e[s\e[0;${_p}H\e[K\e[0;44m\e[1;33m${_r}\e[0m\e[u";done &' mpc is defined like this: function mpc() { echo "$*" | nc 192.168.1.1 6600 } Show Sample Output
This is sample output - yours may be different.
```
132:245 Front 242 - 7Rain [GHost]
```
0

while sleep 1; do (mpc status;mpc currentsong)|awk 'BEGIN{FS=": "}/^Artist:/{r=r""$2};/^Title:/{r=r" - "$2};/^time:/{r=$2" "r};/^state: play/{f=1}END{if(f==1){print r}}'|echo -ne "\e[s\e[0;0H\e[K\e[0;44m\e[1;33m$(cat -)\e[0m\e[u";done &

ichbins · 2012-12-24 18:03:29 8
Command to get list of all existing programming languages from Wikipedia article

Requirements: curl, grep, awk, internet connection with access to wikipedia Loaded page: http://en.wikipedia.org/wiki/List_of_programming_languages If you can make shorter version of this listgetter, you are welcome to paste it here :) Show Sample Output
This is sample output - yours may be different.
```
R (programming language)
R++
Racket (programming language)
RAPID
Rapira
Ratfiv
Ratfor
Rc
REBOL
Core War
REFAL
Reia (programming language)
Revolution (programming language)
Rex (language)
REXX
Rlab
ROOP (programming language)
IBM RPG
RPL (programming language)
Robot Battle
RTL/2
Ruby (programming language)
Rust (programming language)
```
0

curl http://en.wikipedia.org/wiki/List_of_programming_languages | grep "<li>" | awk -F"title=" '{ print $2 }' | awk -F\" '{ print $2 }'

sxiii · 2013-01-09 21:40:11 11
Show numerical values for each of the 256 colors in bash for bold and normal fonts

Shows the ?rendering? for each of the 256 colours in both the bold and normal variant. Using seq is helpful to get even lines, passing $((COLUMNS*2)) to column sort-of-handles the nonprintable characters.
This is sample output - yours may be different.
0

for code in $(seq -w 0 255); do for attr in 0 1; do printf "%s-%03s %bTest%b\n" "${attr}" "${code}" "\e[${attr};38;05;${code}m" "\e[m"; done; done | column -c $((COLUMNS*2))

claudius · 2013-01-13 18:23:44 4
Find Duplicate Files (based on size first, then MD5 hash)

This is a modified version of the OP, wrapped into a bash function. This version handles newlines and other whitespace correctly, the original has problems with the thankfully rare case of newlines in the file names. It also allows checking an arbitrary number of directories against each other, which is nice when the directories that you think might have duplicates don't have a convenient common ancestor directory.
This is sample output - yours may be different.
0

find-duplicates () { find "$@" -not -empty -type f -printf "%s\0" | sort -rnz | uniq -dz | xargs -0 -I{} -n1 find "$@" -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate; }

mpeschke · 2013-01-23 23:20:26 5
Count unique lines in file sorted by instance count (descending) and alphabetically (ascending)

I used to do this sorting with: sort file.txt | uniq -c | sort -nr But this would cause the line (2nd column) to be sorted in descending (reverse) order as well sa the 1st column. So this will ensure the 2nd column is in ascending alphabetical order. Show Sample Output
This is sample output - yours may be different.
```
  24 Poland
  11 Portugal
   8 Australia
   8 USA
   3 Indonesia
   3 Romania
   2 Canada
   2 Slovakia
```
0

sort file.txt | uniq -c | sort -k1nr -k2d

westonruter · 2013-01-28 22:21:05 8
diff files ignoring comments and blank lines (lines starting with #)

Runs a diff on two files ignore comments and blank lines (diff -I=RE does not work as expected). Adapted from a post found on stackexchange.
This is sample output - yours may be different.
0

diff -u <(grep -vE '^(#|$)' file1) <(grep -vE '^(#|$)' file2)

taintedkernel · 2013-02-12 13:59:39 38
Alias for lazy tmux create/reattach

Also detaches session if attached from somewhere else.
This is sample output - yours may be different.
0

if tmux has; then tmux attach -d; else tmux new; fi

Casey · 2013-02-15 14:29:15 6
diff files ignoring comments and blank lines (lines starting with #)
This is sample output - yours may be different.
0

diff -BI '^#' file{1,2}

zlemini · 2013-02-17 11:53:41 38
Let you vanish in the (bash) history.

just an alternative to setting the size, this allows you to scroll up and see your previous commands in a given session but when you logout the history is not saved. That's the only advantage to doing it this way.. Show Sample Output
This is sample output - yours may be different.
```
export HISTFILE=/dev/null
exit (won't try to save history until you logout)
```
0

export HISTFILE=/dev/null

sonic · 2013-02-18 16:37:01 4
Batch transcode .flac to .mp3 with gstreamer
This is sample output - yours may be different.
0

for i in *.flac; do gst-launch filesrc location="$i" ! flacdec ! audioconvert ! lamemp3enc target=quality quality=2 ! id3v2mux ! filesink location="${i%.flac}.mp3"; done

graphiclunarkid · 2013-03-07 22:07:40 4
Fetch all GPG keys that are currently missing in your keyring

The original command doesn't work for me - does something weird with sed (-r) and xargs (-i) with underscores all over... This one works in OSX Lion. I haven't tested it anywhere else, but if you have bash, gpg and perl, it should work. Show Sample Output
This is sample output - yours may be different.
```
gpg: requesting key E8D80906 from hkp server keys.gnupg.net
gpg: key E8D80906: public key "Ayush Sharma <ayush.cena@gmail.com>" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1
gpg: requesting key EFFF0243 from hkp server keys.gnupg.net
gpg: key EFFF0243: public key "GSWoT:US10 (www.gswot.org)" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
```
0

for i in `gpg --list-sigs | perl -ne 'if(/User ID not found/){s/^.+([a-fA-F0-9]{8}).*/\1/; print}' | sort | uniq`; do gpg --keyserver-options no-auto-key-retrieve --recv-keys $i; done

hank · 2013-03-10 09:15:15 5
export key-value pairs list as environment variables

This exports all lines of input file as environment variables, assuming each line is like these: OH=YEAH FU=UUUU
This is sample output - yours may be different.
0

while read line; do export $line; done < <(cat input)

dario · 2013-03-15 08:14:04 10
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Lines per second in a log file

Compress excutable files in place.

The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them. FYI: You can compress any executable sha-bang scripts as well (py, pl, sh, tcl, etc.).

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Learn the difference between single and double quotes

Welcome humans!

Some information about robots. :-)

Insert the last argument of the previous command

for example if you did a: $ ls -la /bin/ls then $ ls !$ is equivalent to doing a $ ls /bin/ls

Opens vi/vim at pattern in file

Open up vi or vim at the first instance of a pattern in [file]. Useful if you know where you want to be, like "PermitRootLogin" in sshd_config. Also, vi +10 [file] will open up a file at line 10. VERY useful when you get "error at line 10" type of output.

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"

Get windows IPv4 and nothing else

May be useful to get user's ip address over the phone, as users struggle to read through a long ipconfig result.

Remove orphaned dependencies on Arch

-Qdt Lists dependencies/packages which are no longer required by any packages -q Output only package name (not the version number) -R Remove package(s) Rest is self-explanatory. I just started out with Arch - so if there is any better/standard method to achieve the same - please suggest.

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Commands tagged bash (821)

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