Commands tagged bash sorted by votes

Commands tagged bash (821)

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Launch command in backgroup or not

If $INBACK is set, command will launch in foreground and inverse. Very useful in script ! We could apply the inverse comportement like that : eval command ${INBACK:+&}
This is sample output - yours may be different.
-1

eval <command> ${INBACK:-&}

Zulu · 2012-04-05 03:50:57 3

Use exit codes that actually means something.

Use meaningful exit codes change "source" to "cat" to view output instead of assigning Show Sample Output

-1

source <(egrep '^#define EX_.*' /usr/include/sysexits.h | sed -e 's/#define/declare -r/g' | sed 's/\//#/g' | sed -e 's/\s\{1,\}/ /g' | sed -e 's/ $[0-9]$/\=\1/'g )

fishdaemon · 2012-09-21 13:30:37 10

creates or attachs to screen

There is no need to use the shell or construct. Screen offers varius ways of detaching and reattaching. man screen and look for -[rRdD]. to create a named session: sdr moo hide: resume: sdr moo Show Sample Output
This is sample output - yours may be different.
```
n/a
```
-1

alias sdr="screen -dR"

tox2ik · 2012-10-22 21:46:26 4
Show git branches by date - useful for showing active branches

simple table
This is sample output - yours may be different.
-1

for k in `git branch -r|awk '{print $1}'`;do echo -e `git show --pretty=format:"%Cgreen%ci_%C(blue)%c r_%Cred%cn_%Creset" $k|head -n 1`$k;done|sort -r|awk -F"_" '{printf("%s %17s %-22s %s\n",$1,$2,$3,$4)}'

varon · 2012-10-29 12:38:24 6

Find out if a module is installed in perl (and what version)

This attempts to load a Perl Module (-M flag) and use version 9999, since no module has a version this high, Perl exits either a) telling you the version of the module installed or b) tells you it can't find the module. Show Sample Output

-1

perl -MModule::Name\ 9999 -e 1

three18ti · 2013-01-15 22:51:39 4

check your up to date delicious links.

This commands queries the delicious api then runs the xml through xml2, grabs the urls cuts out the first two columns, passes through uniq to remove duplicates if any, and then goes into linkchecker who checks the links. the links go the blacklist in ~/.linkchecker/blacklist. please see the manual pages for further info peeps. I took me a few days to figure this one out. I how you enjoy it. Also don't run these api more then once a few seconds you can get banned by delicious see their site for info. ~updated for no recursive Show Sample Output
This is sample output - yours may be different.
```
1 http://www.jokosher.org/
1 http://www.learnopenoffice.org/calccontents.htm
1 http://ubcd4win.com/forum/index.php?showtopic=9630
1 http://212.182.0.171/dwww/
1 http://www.smarthomeforum.com/start/default.asp
1 http://www.sjrcc.edu/
1 http://curvedns.on2it.net/docs
1 http://www.smarthomeforum.com/
```
-1

curl -k https://Username:Password@api.del.icio.us/v1/posts/all?red=api | xml2| \grep '@href' | cut -d\= -f 2- | sort | uniq | linkchecker -r0 --stdin --complete -v -t 50 -F blacklist

bbelt16ag · 2013-05-04 17:43:21 8
Batch resize all images to a width of 'X' pixels while maintaing the aspect ratio

Batch resize all images to a width of 'X' pixels while maintaing the aspect ratio. This makes uses of ImageMagick to make life easier.
This is sample output - yours may be different.
-1

mogrify -resize SIZE_IN_PIXELS *.jpg

o0110o · 2013-07-05 14:14:04 6
Removes single line from known_hosts file

Quickly remove the conflicting line (key) from current users known_hosts file when there is an SSH host conflict. Very nice when you get tired of writing out full commands. Ideally you would place this into your .bash_profile Usage: rhost [n] Example: rhost 33 (removes line 33 from ~/.ssh/known_hosts) Function assumes the $HOME exists, you could alternatively use "~/.ssh/known_hosts" Mac OSX likes a space for sed -i "$1" d
This is sample output - yours may be different.
-1

rhost() { if [[ $1 =~ ^[0-9]+$ ]]; then sed -i "$1"d ${HOME}/.ssh/known_hosts; else echo "rhost [n]"; fi }

lowjax · 2013-08-01 21:10:34 13
find all minimum values in file with at least 100 lines
This is sample output - yours may be different.
-1

for ff in directory; do numLines=`wc -l $ff`; numLines=$(echo $numLines | sed 's/ .*//g'); min=$(sort -nrk 1 $ff | tail -1); if [ $numLines -gt 100 ]; then echo $min >> minValues; fi;done;

user1234 · 2013-09-23 04:04:52 7
A simple overview of memory usage refreshed at user designated intervals.

This command shows a high level overview of system memory and usage refreshed in seconds. Change -n 10 to you desired refresh interval. Show Sample Output
This is sample output - yours may be different.
```
Every 10.0s: free -m                                                                   Fri Jan  3 15:58:44 2014

             total       used       free     shared    buffers     cached
Mem:         12001       3565       8435          0        268       1613
-/+ buffers/cache:       1682      10318
Swap:         1951          0       1951
```
-1

watch -n 10 free -m

Darkstar · 2014-01-04 10:10:15 12
Show best quote from reddit to your terminal

The rsstail is the python version (python-rsstail). The final command pipe it on every new line to gammu and a connected phone rsstail -o -n 1 --f 'RedditQuote: {title}' http://www.reddit.com/r/quotes/new/.rss | while read line; do /usr/bin/gammu --sendsms TEXT +*yournumber* -text "$line"; done Show Sample Output
This is sample output - yours may be different.
```
RedditQuote: ?You're beautiful, but you're empty. No one could die for you.? &#8213; Antoine de Saint-Exup?ry, The Little Prince
```
-1

rsstail -o -n 1 --f 'RedditQuote: {title}' http://www.reddit.com/r/quotes/new/.rss

Youpfu · 2014-01-08 15:33:48 8
Show total cumulative memory usage of a process that spawns multiple instances of itself
This is sample output - yours may be different.
-1

CMD=chrome ; ps h -o pmem -C $CMD | awk '{sum+=$1} END {print sum}'

pdxdoughnut · 2014-01-08 23:05:09 8
Generrate Cryptographically Secure RANDOM PASSWORD

Explination: https://stackoverflow.com/questions/2257441/random-string-generation-with-upper-case-letters-and-digits/23728630#23728630 Why 16 Characters: https://www.wired.com/story/7-steps-to-password-perfection/ Show Sample Output
This is sample output - yours may be different.
```
a7Bt4WGSz8hjJWIP
```
-1

python -c "import string; import random;print(''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits + string.ascii_lowercase) for _ in range(16)))"

rootduck · 2019-06-14 17:35:12 39
shell bash iterate number range with for loop

iterating range of numer with for loop in shell or bash Show Sample Output
This is sample output - yours may be different.
```
10
11
12
13
14
15
16
17
18
19
20
```
-1

rangeBegin=10; rangeEnd=20; for numbers in $(eval echo "{$rangeBegin..$rangeEnd}"); do echo $numbers;done

aysadk · 2019-07-26 09:19:44 222
shell bash iterate number range with for loop

"seq" has an additional parameter to use as INCREMENT. # seq FIRST INCREMENT LAST https://linux.die.net/man/1/seq Show Sample Output
This is sample output - yours may be different.
```
1
2
3
4
5
```
-1

for i in $(seq 1 5) ; do echo $i ; done

guilsson · 2019-07-29 18:34:12 203
Fork bomb (don't actually execute)

“$0” is a variable returning the name of the script that you call it in — so running “./$0&” twice amounts to the script running itself in a separate process twice. Show Sample Output
This is sample output - yours may be different.
```
#!/bin/bash
./$0&
./$0&
```
-1

echo -e “\x23\x21/bin/bash\n\.\/\$\0\&\n\.\/\$\0\&” > bomb.sh && ./bomb.sh

realkstrawn93 · 2021-04-30 19:33:40 134
read a file with table like data

This will print out the third column of every line in FILE. Useful for many files in /proc or *csv data. Show Sample Output
This is sample output - yours may be different.
```
3
```
-2

echo 1 2 3 > FILE; while read -a line; do echo ${line[2]}; done < FILE

occam · 2009-03-06 15:32:40 6
Easy Regex based mass renaming

Allows for quick mass renaming, assuming the user has some familiarity with regular expressions. Basically, it replaces the original_file_name in the output of ls with "mv -v original_file_name new_file_name" and passes the output to sh. Show Sample Output
This is sample output - yours may be different.
```
$ ls ~/manga/ | sed -rn -e 's/naruto_(...\.zip)/mv -v & \1/p' | sh
`naruto_431.zip' -> `431.zip'
`naruto_432.zip' -> `432.zip'
`naruto_433.zip' -> `433.zip'
`naruto_434.zip' -> `434.zip'
$
```
-2

ls /some/directory | sed -rn -e 's/input_file_regex/mv -v & output_file_name/p' | sh

polar · 2009-03-25 09:20:15 10
Bash Alias That Plays Music from SomaFM

This is the alias command that I discussed in my prior release which you can add to your ~/.bashrc. This command asks for the station name and then connects to somafm, Great for those who have linux home entertainment boxes and ssh enabled on them, just for the CLI fiends out there ( I know I'm one of them ;) You can find future releases of this and many more scripts at the teachings of master denzuko - denzuko.co.cc.
This is sample output - yours may be different.
-2

alias somafm='read -p "Which station? "; mplayer --reallyquiet -vo none -ao sdl http://somafm.com/startstream=${REPLY}.pls'

denzuko · 2009-05-05 12:13:46 3
create tar.gz archive

Create a single tar.gz archive I know it's a very basic one, but it's one I keep forgetting. Show Sample Output
This is sample output - yours may be different.
```
/path/to/dir/or/file/
/path/to/dir/or/file/file1.ext
/path/to/dir/or/file/file2.ext
```
-2

tar -pczf archive_name.tar.gz /path/to/dir/or/file

ryuslash · 2009-07-17 19:53:02 30
List path of binaries
This is sample output - yours may be different.
-2

echo $PATH|awk -F: ' { for (i=1; i <= NF; i++) print $i }'

nitins · 2009-08-12 07:56:56 4
Echo the local IP addresses of the machines on your local network

If you need to ssh into a computer on the local network but you're unsure of the ip to use, then ping them and see if you get a response. If you do, print out the address you got it from. Adjust the range to suit your network.
This is sample output - yours may be different.
-2

for i in 192.168.1.{61..71};do ping -c 1 $i &> /dev/null && echo $i;fi;done

AlecSchueler · 2009-08-26 06:04:24 11
Checks apache's access_log file, strips the search queries and shoves them up your e-mail

It's not a big line, and it *may not* work for everybody, I guess it depends on the detail of access_log configuration in your httpd.conf. I use it as a prerotate command for logrotate in httpd section so it executes before access_log rotation, everyday at midnight.
This is sample output - yours may be different.
-2

cat /var/log/httpd/access_log | grep q= | awk '{print $11}' | awk -F 'q=' '{print $2}' | sed 's/+/ /g;s/%22/"/g;s/q=//' | cut -d "&" -f 1 | mail youremail@isp.com -s "[your-site] search strings for `date`"

isma · 2009-11-22 03:03:06 7
Normalize volume in your mp3 library

Execute this in the root of your music library and this recurses through the directories and normalizes each folder containing mp3s as a batch. This assumes those folders hold an album each. The command "normalize-audio" may go by "normalize" on some systems.
This is sample output - yours may be different.
-2

find . -type d -exec sh -c "normalize-audio -b \"{}\"/*.mp3" \;

Mikelifeguard · 2009-12-08 03:13:13 7
Purge frozen messages in Exim

Although Exim will purge frozen (undeliverable) messages over time, the command "exim -Mrm #id#" where #id# is a particular message ID will purge a message immediately. Being lazy, I don't want to type the command for each frozen message, so I wrote the one-liner to do it for me.
This is sample output - yours may be different.
-2

for i in `mailq | awk '$6 ~ /^frozen$/ {print $3}'`; do exim -Mrm $i; done

rjamestaylor · 2010-01-13 21:28:45 3
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Show all symlinks

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"

Counting the source code's line numbers C/C++ Java

Count your source and header file's line numbers. This ignores blank lines, C++ style comments, single line C style comments. This will not ignore blank lines with tabs or multiline C style comments.

Using bash inline

There are two ways to use "here documents" with bash to fill stdin: The following example shows use with the "bc" command. a) Using a delimiter at the end of data: $ less-than less-than eeooff bc > k=1024 > m=k*k > g=k*m > g > eeooff 1073741824 b) using the "inline" verion with three less-than symbols: $ less-than less-than less-than "k=1024; m=k*k; g=k*m; g" bc 1073741824 One nice advantage of using the triple less-than version is that the command can easily be recalled from command line history and re-executed. PS: in this "description", I had to use the name "less-than" to represent the less-than symbol because the commandlinefu input text box seems to eat up the real less-than symbols. Odd.

Download from Rapidshare Premium using wget - Part 1

In order to do that, first you need to save a cookie file with your account info. These commands do it (maybe you need to create the '.cookies' dir before). Also, you need to check the "Direct downloads" option on the Premium Zone >> Settings tab. You need to do this once (as long you maintain the file or your Rapidshare Premium account).

make, or run a script, everytime a file in a directory is modified

List packages manually installed with process currently running

Sometimes we install programs, we forget about them, and they stay there wasting RAM. This one-liner try to find them.

Convert all old SVN repositories in one directory to new format

Text to image with transparent background

Create transparent image to use as icon, watermark for other images, etc.

Simulate typing

this also generates errors (change 4 to higher number for more mistakes)

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Commands tagged bash (821)

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