Commands tagged bash sorted by votes

Commands tagged bash (821)

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Calculate days on which Friday the 13th occurs

Simply change the years listed in the first seq, and it will print out all the months in that span of years that have Friday the 13ths in them. Show Sample Output
This is sample output - yours may be different.
```
2010 -> August 
2011 -> May 
2012 -> January April July 
2013 -> September December 
2014 -> June 
2015 -> February March November 
2016 -> May 
2017 -> January October 
2018 -> April July 
```
1

for y in $(seq 1996 2018); do echo -n "$y -> "; for m in $(seq 1 12); do NDATE=$(date --date "$y-$m-13" +%A); if [ $NDATE == 'Friday' ]; then PRINTME=$(date --date "$y-$m-13" +%B);echo -n "$PRINTME "; fi; done; echo; done

suspenderguy · 2018-06-13 20:11:46 242
Compute the average number of KB per file for each dir

Shorter version using --tag
This is sample output - yours may be different.
1

parallel --tag echo '$(du -s {} | awk "{print \$1}") / $(find {} | wc -l)' \| bc -l ::: *

IndustrialJoe · 2018-07-05 18:33:21 275
Calculate days on which Friday the 13th occurs

Alter the years in the first brace expansion to select your year range. Modify date format to your liking but leave " %w" at the end. Show Sample Output
This is sample output - yours may be different.
```
2018 April
2018 July
2019 September
2019 December
2020 March
2020 November
2021 August
2022 May
```
1

for i in {2018..2022}-{01..12}-13; do date --date $i +"%Y %B %w" | sed '/[^5]$/d; s/ 5*$//'; done

justsomeguy · 2018-07-09 15:47:39 248
Process command output line by line in a while loop

This snippet allows to process the output of any bash command line by line.
This is sample output - yours may be different.
1

while read -r line; do echo $line; done < <(YOUR COMMAND HERE);

paulera · 2018-08-13 10:03:11 328
Silently deletes lines containing a specific string in a bunch of files

This command will find all occurrences of one or more patterns in a collection of files and will delete every line matching the patterns in every file
This is sample output - yours may be different.
1

for file in $(egrep 'abc|def' *.sql | cut -d":" -f1 | uniq); do sed -i '/abc/d' ./$file ; sed -i '/def/d' ./$file; done

guillaume1306 · 2018-12-10 16:23:20 30
Get the full path of a bash script's Git repository head.

Rather than complicated and fragile paths relative to a script like "../../other", this command will retrieve the full path of the file's repository head. Safe with spaces in directory names. Works within a symlinked directory. Broken down: cd "$(dirname "${BASH_SOURCE[0]}")" temporarily changes directories within this expansion. Double quoted "$(dirname" and ")" with unquoted ${BASH_SOURCE[0]} allows spaces in the path. git rev-parse --show-toplevel gets the full path of the repository head of the current working directory, which was temporarily changed by the "cd".
This is sample output - yours may be different.
1

$(cd "$(dirname "${BASH_SOURCE[0]}")" && git rev-parse --show-toplevel)

rakurai · 2019-01-19 11:02:17 35
shuffle lines via bash

Using perl in a one-liner is a bit overkill to randomly sort some input. `sort` from coreutils should be enough.
This is sample output - yours may be different.
1

seq 1 9 | sort -R

chtk · 2019-07-05 18:36:49 39
shell bash iterate number range with for loop
This is sample output - yours may be different.
1

rangeBegin=10; rangeEnd=20; for ((numbers=rangeBegin; numbers<=rangeEnd; numbers++)); do echo $numbers; done

forouharid · 2019-07-27 21:04:27 77
Bash alias to output the current Swatch Internet Time

Output the current time in Swatch “Internet Time”, aka .beats. There are 1000 .beats in a day, and @0 is at 00:00 Central European Standard Time. This was briefly a thing in the late 1990s. More details: https://2020.swatch.com/en_ca/internet-time/ The alias is rather quote heavy to protect the subshell, so the bare command is: echo '@'$(TZ=GMT-1 date +'(%-S + %-M * 60 + %-H * 3600) / 86.4'|bc) Show Sample Output
This is sample output - yours may be different.
```
@811
```
1

alias beats='echo '\''@'\''$(TZ=GMT-1 date +'\''(%-S + %-M * 60 + %-H * 3600) / 86.4'\''|bc)'

scruss · 2021-05-27 18:42:21 192
Download mp3 files linked in a RSS podcast feed

Directly download all mp3 files of the desired podcast
This is sample output - yours may be different.
1

curl http://radiofrance-podcast.net/podcast09/rss_14726.xml | grep -Eo "(http|https)://[a-zA-Z0-9./?=_%:-]*mp3" | sort -u | xargs wget

pascalvaucheret · 2021-08-09 13:40:26 181
Infinite loop ssh
This is sample output - yours may be different.
1

until ssh login@10.0.0.1; do echo "Nope, keep trying!"; fi; sleep 10; done

minnmass · 2021-09-29 14:53:55 1001
Extract content between the first " and the last " double quotes

Thanks to this user: https://stackoverflow.com/a/35636373/2394635 Show Sample Output
This is sample output - yours may be different.
```
checkin_resumestorevisit \"- "Online_V2.mt
```
1

s='Test "checkin_resumestorevisit \"- "Online_V2.mt" Run'; s=${s#*'"'}; s=${s%'"'*}; echo "$s"

bugmenot · 2022-01-08 16:16:18 365
Add all not commited files to svn
This is sample output - yours may be different.
0

svn st | grep ^? | xargs svn add 2> /dev/null

douglas · 2009-02-25 11:40:51 6
for loop, counting forward for backward

The brace expansion also allows you to count backward: for i in {15..1}; do echo $i; done You can also use this construct to create new file or new directory: mkdir dir{1..3} # Same as mkdir dir1 dir2 dir3
This is sample output - yours may be different.
0

for i in {1..15}; do echo $i; done

haivu · 2009-03-21 23:08:41 5
Compare a file with the output of a command or compare the output of two commands
This is sample output - yours may be different.
0

vimdiff foo.c <(bzr cat -r revno:-2 foo.c)

HorsePunchKid · 2009-03-24 18:15:48 5
Passwordless mysql{,dump,admin} via my.cnf file

The file .my.cnf located at user's home directory is used for mysql login. If this file exists, then mysql -uYOURUSERNAME -pYOURPASSWORD database -e 'SOME SQL COMMAND' can be replaced with mysql database -e 'SOME SQL COMMAND' It saves you from typing! This is valid for mysqladmin and mysqldump commands as well. Show Sample Output
This is sample output - yours may be different.
```
[client]
user = YOURUSERNAME
password = YOURPASSWORD
```
0

echo -e "[client]\nuser = YOURUSERNAME\npassword = YOURPASSWORD" > ~/.my.cnf

alperyilmaz · 2009-03-24 19:05:39 9
Number of seconds to certain unix date

Echos the number of seconds from the current time till the specified time (Example in command is (2**31-1)) aka the Unix epoch. Just replace that number with the specified date (in seconds past Jan. 1st 1970) and it will return the seconds. NOTE: Only works in bash Show Sample Output
This is sample output - yours may be different.
```
908835068
```
0

echo $( (( $( (2**31 -1) ) - $(date +%s) )) )

Chartreuse · 2009-04-02 05:14:23 7
Working random fact generator

This is a working version, though probably clumsy, of the script submitted by felix001. This works on ubuntu and CygWin. This would be great as a bash function, defined in .bashrc. Additionally it would work as a script put in the path. Show Sample Output
This is sample output - yours may be different.
```
The only letter not appearing on the Periodic Table is the letter "J".
```
0

lynx -dump randomfunfacts.com | grep -A 3 U | sed 1D

xizdaqrian · 2009-05-05 07:52:10 12
Frequency Sweep

Generates a frequency sweep from $x to $y, with $d numbers inbetween each step, and with each tone lasting $l milliseconds. Show Sample Output
This is sample output - yours may be different.
```
Sound.
```
0

l=500; x=500; y=200; d=-15;for i in `seq $x $d $y`; do beep -l $l -f $i;done

unixmonkey4581 · 2009-07-07 22:12:20 9
Migrate gems from one ruby installation to another

gemInst.sh: #!/bin/bash for i in $@; do if [ "$1" != "$i" ] then echo /newInstall/gem install $1 -v=\"$i\" /newInstall/gem install $1 -v="$i" if [ "$?" != "0" ] then echo -e "\n\nGEM INSTALL ERROR: $1\n\n" echo "$1" > gemInst.err fi fi done
This is sample output - yours may be different.
0

/originalInstall/gem list | tr -d '(),' | xargs -L 1 sudo ./gemInst.sh

snakerdlk · 2009-07-09 21:46:06 4
Sorting by rows

Save the script as: sort_file Usage: sort_file < sort_me.csv > out_file.csv This script was originally posted by Admiral Beotch in LinuxQuestions.org on the Linux-Software forum. I modified this script to make it more portable. Show Sample Output
This is sample output - yours may be different.
```
Sort values arranged in rows, like:
x3, x5, x1, x4, x7, x2, x6
x11, x13, x14, x8, x10, x12, x9
... ... ... ... ... ... ...
After executing the script, values will be horizontally sorted:
x1, x2, x3, x4, x5, x6, x7
x8, x9, x10, x11, x12, x13, x14
... ... ... ... ... ... ...
where x1, x2, ..., xn are integers
Each row can have n integers and 
x1 < x2 < x3, ..., < x7
x8 < x9 < x10, ..., < x14
..   ..   ..           ..
After executing the script, each row will be sorted in ascending order.
```
0

infile=$1 for i in $(cat $infile) do echo $i | tr "," "\n" | sort -n | tr "\n" "," | sed "s/,$//" echo done

iframe · 2009-07-12 21:23:37 6
Generate Files with Random Content and Size in Bash

Create a bunch of random files with random binary content. Basically dd dumps randomly from your hard disk to files random-file*. Show Sample Output
This is sample output - yours may be different.
```
random-file.5
random-file.6
random-file.7
random-file.8
random-file.9
```
0

no_of_files=10; counter=1; while [[ $counter -le $no_of_files ]]; do echo Creating file no $counter; dd bs=1024 count=$RANDOM skip=$RANDOM if=/dev/sda of=random-file.$counter; let "counter += 1"; done

rajaseelan · 2009-07-31 16:34:47 5
Do a search-and-replace in a file after making a backup

"&&" runs sed if and only if the backup completed and /bin/cp exited cleanly. Works for multiple files; just specify multiple filenames (or glob). Use -v switch for cp to play it safe.
This is sample output - yours may be different.
0

for file in <filename>; do cp $file{,.bak} && sed 's/old/new/g' $file.bak > $file; done

Cenobite · 2009-08-25 16:19:45 5
for loop with leading zeros

Uses 'seq' with formatting parameter to generate the necessary padded sequence. Change '%02.0f' to how many digits you need (for 3, use %03.0f, etc) and replace 5 & 15 with your desired min and max. Show Sample Output
This is sample output - yours may be different.
```
05
06
07
08
09
10
11
12
13
14
15
```
0

for s in `seq -f %02.0f 5 15`; do echo $s; done

Yeraze · 2009-09-18 13:21:38 6
for loop with leading zero in bash 3

emulates bash4's "echo {03..20}" Uses bash3 builtin function printf Show Sample Output
This is sample output - yours may be different.
```
03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20
```
0

printf "%02u " {3..20}; echo

Escher · 2009-09-18 18:48:41 4
‹ First < 17 18 19 20 21 > Last ›

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draw matrix using dot

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Backup trought SSH

Number of files in a SVN Repository

This command will output the total number of files in a SVN Repository.

ARP Scan

A much quicker and (not dirtier) option. use the man page for help. On linux/ubuntu you will need to `sudo apt-get -y install arp-scan`.

Re-emerge all ebuilds with missing files (Gentoo Linux)

Extract icons from windows exe/dll

wrestool can be found in icoutils (http://www.nongnu.org/icoutils)

bash auto-complete your screen sessions

this bash command sets it so that when you type "screen ", it searches your running screens, and present valid auto-complete choices. The output is . Note: You must have programmable completion enabled. Check with "shopt progcomp", set with "shopt -s progcomp"

Batch Convert SVG to PNG (in parallel)

Convert some SVG files into PNG using ImageMagick's convert command. Run the conversions in parallel to save time. This is safer than robinro's forkbomb approach :-) xargs runs four processes at a time -P4

Remove specific versions of old kernels (Ubuntu/Debian)

If, for example, you want to remove all kernels and headers but the last three versions, you can't use one of that magic all-in-one "remove old stuff" commands. With this simple but elegant command you can remove a range of versions, or a list of versions with e.g. {14,16,20}.

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Commands tagged bash (821)

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