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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
Extract all urls from the last firefox sessionstore.js file used.

Require "grep -P" ( pcre ). If you don't have grep -P, use that : grep -Eo '"url":"[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q) | cut -d'"' -f4
This is sample output - yours may be different.
0

grep -oP '"url":"\K[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q)

sputnick · 2009-12-09 20:34:32 4
path manipulation in bash

I used to do a lot of path manipulation to set up my development environment (PATH, LD_LIBRARY_PATH, etc), and one part of my environment wasn't always aware of what the rest of the environment needed in the path. Thus resetting the entire PATH variable wasn't an option; modifying it made sense. The original version of the functions used sed, which turned out to be really slow when called many times from my bashrc, and it could take up to 10 seconds to login. Switching to parameter substitution sped things up significantly. The commands here don't clean up the path when they are done (so e.g. the path gets cluttered with colons). But the code is easy to read for a one-liner. The full function looks like this: remove_path() { eval PATHVAL=":\$$1:" PATHVAL=${PATHVAL//:$2:/:} # remove $2 from $PATHVAL PATHVAL=${PATHVAL//::/:} # remove any double colons left over PATHVAL=${PATHVAL#:} # remove colons from the beginning of $PATHVAL PATHVAL=${PATHVAL%:} # remove colons from the end of $PATHVAL export $1="$PATHVAL" } append_path() { remove_path "$1" "$2" eval PATHVAL="\$$1" export $1="${PATHVAL}:$2" } prepend_path() { remove_path "$1" "$2" eval PATHVAL="\$$1" export $1="$2:${PATHVAL}" } I tried using regexes to make this into a cleaner one-liner, but remove_path ended up being cryptic and not working as well: rp() { eval "[[ ::\$$1:: =~ ^:+($2:)?((.*):$2:)?(.*):+$ ]]"; export $1=${BASH_REMATCH[3]}:${BASH_REMATCH[4]}; }; Show Sample Output
This is sample output - yours may be different.
```
pbrannan@random:~> foo="abc:def:ghi"
pbrannan@random:~> echo $foo
abc:def:ghi
pbrannan@random:~> ap foo bar
pbrannan@random:~> echo $foo
:abc:def:ghi::bar
pbrannan@random:~> pp foo xyz
pbrannan@random:~> echo $foo
xyz:::abc:def:ghi::bar:
pbrannan@random:~> rp foo xyz
pbrannan@random:~> echo $foo
:::abc:def:ghi::bar::
```
0

rp() { local p; eval p=":\$$1:"; export $1=${p//:$2:/:}; }; ap() { rp "$1" "$2"; eval export $1=\$$1$2; }; pp() { rp "$1" "$2"; eval export $1=$2:\$$1; }

cout · 2010-07-15 18:52:01 79
Instant editing screenshot with Gimp

Thank You, hackerb9!
This is sample output - yours may be different.
0

sleep 4; xwd > /tmp/_.xwd ; gimp /tmp/_.xwd

yababay · 2010-09-19 17:04:32 3
List contents of jar
This is sample output - yours may be different.
0

unzip -l file.jar

unixmonkey13150 · 2010-10-20 22:44:58 3
archlinux: clears package cache of uninstalled packages

Clears the package cache of all uninstalled packages. Does not remove package configuration files in user's home directory.
This is sample output - yours may be different.
0

sudo pacman -Sc

ibnarrashid · 2011-03-20 20:55:32 3
Mark manually deleted files as deleted in svn

Helps if you accidentally deleted files from an svn repo with plain rm and you would like to mark them for svn to delete too.
This is sample output - yours may be different.
0

svn status|grep -iR '^!'|sed 's/!/ /g'|xargs -i svn rm '{}'

erdeszt · 2011-10-06 08:11:25 5
CPIO better than TAR

Archive all .sh files in a directory into a gzip archive.
This is sample output - yours may be different.
0

find . -type f -name '*.sh' -print | cpio -o | gzip >sh.cpio.gz

djangofan · 2011-12-21 21:13:29 9
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
List users in a group

I can't find the lid command on my system, there is also another complied program: http://xyne.archlinux.ca/projects/lsgrp/
This is sample output - yours may be different.
0

lsgrp() { read GID USERS <<< "$(grep "^$1:" /etc/group | cut -d: -f3,4 | tr ':,' ' ')" ; echo -e "${USERS// /\n}" | egrep -v "^($1)?$" ; egrep :[0-9]+:$GID: /etc/passwd | cut -d: -f1 ; }

livibetter · 2012-03-16 09:57:33 3
List visible files ordered by modification date and shows date in full iso format
This is sample output - yours may be different.
0

ls -tl --time-style=full-iso

DavidAlfonso · 2012-05-02 16:33:23 3
Execute multiple SQL commands from a File
This is sample output - yours may be different.
0

db2 connect to STGNSY3; db2 -tvf source_CUST_DIM_DELTA.sql > kk.out

kaushalmehra · 2012-07-09 21:28:58 3
Delete all files matching a pattern
This is sample output - yours may be different.
0

find . -name vmware-*.log -exec rm -i {} \;

defc0n1 · 2012-08-29 11:19:37 4
Wait for Web service to spin up, aka alert me when the server stops returning a 503
This is sample output - yours may be different.
0

while curl -dsL example.com 2>&1 | grep 503;do sleep 8;done;echo server up

emile · 2013-07-10 19:03:25 6
Convert mp4 to mp3 in a directory

Good for when you download youtube videos and want the mp3 for your mp3 player.
This is sample output - yours may be different.
0

for a in $(find . -maxdepth 1 -name "*.mp4" -type f -printf "%f\n" | rev | cut -d '.' -f2- | rev | sort -u); do if [ ! -f "$a.mp3" ]; then avconv -i "$a."* -vn -ab 128 "$a.mp3"; fi done

adanisch · 2014-06-27 05:13:53 7

git push set upstream with current branch

The idea is to get the current branch name directly using git symbolic-ref --short HEAD name and not type it manually. Show Sample Output

git push --set-upstream origin `git symbolic-ref --short HEAD`

phoe6 · 2016-01-08 18:23:07 11

Block all FaceBook traffic

I don't know why you would want to echo "blocking ....", but my alternative is functionally equivalent with the extra echo.
This is sample output - yours may be different.
0

ASN=32934;whois -H -h riswhois.ripe.net -- -F -K -i $ASN|awk '/^'$ASN'/ {if ($2 ~ /::/) {a="6"} else {a=""};b="sudo ip"a"tables -A INPUT -s "$2" -j REJECT"; print " blocking "$2;system(b)}'

AndrewM · 2016-07-22 07:48:27 14
Toggle the Touchpad on or off
This is sample output - yours may be different.
0

synclient TouchpadOff=$(synclient -l | grep -q 'TouchpadOff.*1'; echo $?)

Cas00 · 2017-03-11 12:11:01 20
Summing up numeric values using bash

For example to add up the disk usage at several disjoint locations. The $[..] is for arithmetic evaluation in bash. Alternatively pipe to the bc command. Show Sample Output
This is sample output - yours may be different.
```
101K
```
0

numfmt --to=iec $[$(du -s /home/*/docs | cut -f 1 | paste -sd+)]

oldo · 2017-07-15 00:53:20 18
Burn ass subtitle in prores file
This is sample output - yours may be different.
0

ffmpeg -i movie.mov -c:v prores -profile:v 1 -c:a pcm_s16le -vf subtitles=subtitle.ass subtitledmovie.mov

ghms · 2017-08-28 20:12:53 17
JVM Garbage Collector Stats
This is sample output - yours may be different.
0

jstat -gc [jvmpid]

wwest4 · 2009-02-05 21:23:07 16
Adds characters at the beginning of the name of a file
This is sample output - yours may be different.
0

rename 's/.*/[it]$&/' *.pdf

kayowas · 2009-03-27 15:12:02 7
Convert Raw pictures to jpg
This is sample output - yours may be different.
0

for img in $( ls *.CR2 ); do convert $img $img.jpg; done

bass000 · 2009-04-25 19:11:52 7
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
Recursively search a directory tree for all .php .inc .html .htm .css .js files for a certain string
This is sample output - yours may be different.
0

find -type f -regex ".*\.$js\|php\|inc\|htm[l]?\|css$$" -exec grep -il 'searchstring' '{}' +

tuxilicious · 2010-02-07 23:41:00 5
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Press ctrl+r in a bash shell and type a few letters of a previous command

In the sample output, I pressed ctrl+r and typed the letters las. I can't imagine how much typing this has saved me.

Show a random oneliner from commandlinefu.com

This will parse a random command json entry from http://commandlinefu.com A must have in your .bash_profile to learn new shell goodies at login!!!

Oneliner to run commands on multiple servers

Oneliner to run commands on multiple servers over ssh. - First parameter "$1" is the command you want to execute remotely. ( It can be multiple commands e.g. "hostname;uptime") - Second parameter "${@:2}" represents the remote host/s you want to run the command/s on.

kill all processes using a directory/file/etc

This command will kill all processes using a directory. It's quick and dirty. One may also use a -9 with kill in case regular kill doesn't work. This is useful if one needs to umount a directory.

Url Encode

Converts reserved characters in a URI to their percent encoded counterparts. Alternate python version: $ echo "$url" | python -c 'import sys,urllib;print urllib.quote(sys.stdin.read().strip())'

Testing php configuration

cymru malware check

Which .service related this file?

I use this as an alias to get all .service files related a single installed file/conf (if it has services, of course). For rpm based systems ;)

Get your external IP address if your machine has a DNS entry

Using DynDNS or a similar service not only allows access to your home machine from outside without needing to know what IP the ISP has assigned to it but it also comes in handy if you want to know your external IP address. The only purpose of the sed command is to remove the leading "host.na.me has address " part from the output. If you don't need to discard it you can simply use $ host $HOSTNAME

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

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