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Pick the first program found from a list of alternatives

This function is used to set environmental variables from a list of alternatives depending on what's installed on the system. It returns the first program found in the list. Example usage: export BROWSER=$(find_alternatives chromium-browser google-chrome opera firefox firefox-bin iceweasel konqueror w3m lynx) . export EDITOR=$(find_alternatives vim nano pico emacs kate) . export PAGER=$(find_alternatives vimpager less most more pg)
This is sample output - yours may be different.
-1

find_alternatives(){ for i;do which "$i" >/dev/null && { echo "$i"; return 0;};done;return 1;}

eightmillion · 2011-01-06 19:53:46 3
Remove superfluous from conf file

Use it with cat and '|' for know what is used in a conf file. For example cat /etc/squid/squid.conf | sed -re '/^#/d ; s/#.*$// ; /^\s$/d' : Show you what you use in your file conf. It removes all comments and empty lines. Empty lines are lines with nothing, a tab, or a space.
This is sample output - yours may be different.
-1

sed -re '/^#/d ; s/#.*$// ; /^\s*$/d'

Zulu · 2012-02-02 18:12:52 4
Create random password in reasonable time

It will produce passwords with length of 20 printable characters within a reasonable time. For shorter or longer passwords just change the 20 in bs=20 to something more convenient. To create only alpha numeric passwords change [:print:] to [:alnum:] Show Sample Output
This is sample output - yours may be different.
```
$ dd if=/dev/urandom  | tr -d -c [:print:] | tr -d " " | dd count=1 bs=20  2> /dev/null; echo 
beO+Y`gS%rbAFNH`qd/?
```
-1

dd if=/dev/urandom | tr -d -c [:print:] | tr -d " " | dd count=1 bs=20 2> /dev/null; echo

Progent · 2013-03-01 22:42:29 5
removing those pesky malformed lines at the end of a text file..

tells you the number of lines in said file, and then tail the last 100 lines ( or how many are messed up) then u take the total amount of lines and then subract the 100 or so lines u DONT WANT, then do a head -n $new_number and then redirect it to new file.db
This is sample output - yours may be different.
-1

cat -n $file | tail -n 100 && head -n number-of-lines-you-want-to-keep > newfile

bbelt16ag · 2009-02-15 01:02:10 9
Check the backdoors and security.chkrootkit is a tool to locally check for signs of a rootkit.

chkrootkit is a tool to locally check for signs of a rootkit,Get it from the website http://www.chkrootkit.org
This is sample output - yours may be different.
-1

chkrootkit -x | less

unixbhaskar · 2009-08-30 12:47:08 3
to display number of lines in a file without using wc command
This is sample output - yours may be different.
-1

sed -n "$=" fileName

harish · 2010-10-19 08:50:24 3
convert myisam to innodb

Convert all Tables from MyISAM to InnoDB
This is sample output - yours may be different.
-1

for I in $(echo "show tables" | mysql -u<user> <database>`; do echo "ALTER TABLE $I ENGINE = INNODB"| mysql -u<user> <database>; done

int9h · 2011-12-16 14:51:10 15
which domain controller the user currently logged onto

The command line can be accessed by using the cmd command which will open a command window with a DOS interface. The command line is a throw back to the early days of computing before there was a Windows interface. Show Sample Output
This is sample output - yours may be different.
```
\\cicciobombadc
```
-1

echo %logonserver%

0disse0 · 2011-06-13 09:52:51 6
List of commands you use most often

List of commands you use most often suppressing sudo Show Sample Output
This is sample output - yours may be different.
```
64 ifconfig
35 firefox
33 ls
29 ping
28 yaourt
27 history
25 cat
21 vim
19 /etc/rc.d/wireless
17 init
```
-1

history | awk '{if ($2 == "sudo") a[$3]++; else a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head

JamieKitson · 2012-12-31 13:45:03 4
HDD Performance Read Test

Test your XFS filesystem and Raptor hard drives for write performance.
This is sample output - yours may be different.
-1

dd if=10gb of=/dev/zero bs=1M count=10240

logik · 2009-02-18 15:30:29 10
See The MAN page for the last command
This is sample output - yours may be different.
-1

man !!

SQUIIDUX · 2010-08-14 14:09:31 3
Show amigable path

change ":" in path for new line and associate word path to var $PATH
This is sample output - yours may be different.
-1

alias path='echo $PATH | tr ":" "\n"'

voyeg3r · 2009-03-12 17:07:58 5
use ImageMagik to convert tint (hue rotation) of an icon set directory.
This is sample output - yours may be different.
-1

mogrify -modulate 100,100,70 ../../icons/32x32/*.png

houghi · 2011-06-13 15:11:16 3
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
Edit a single line in multiple files with sed

Find and replace specific characters in a single line in multiple files with sed. Show Sample Output
This is sample output - yours may be different.
```
Original file
file1.txt:This is the MATCHING STRING and ORIGINAL some more text

Replaced file

file1.txt:This is the MATCHING STRING and REPLACEMENT some more text
```
-1

for f in `ls`; do sed -i '/MATCHING STRING/ { s/ORIGINAL/REPLACEMENT/; }' ${f} ; done

krizzo · 2015-05-21 19:37:42 15
remove the last line of all html files in a directory

Some malicious program appends a iframe or script tag to you web pages on some server, use this command to clean them in batch.
This is sample output - yours may be different.
-1

for f in *.html; do head -n -1 $f > temp; cat temp > $f; rm temp; done

Sunng · 2009-10-12 12:49:18 5
How To Get the Apache Document Root
This is sample output - yours may be different.
-1

grep -i '^DocumentRoot' /etc/httpd/conf/httpd.conf | cut -f2 -d'"'

hm2k · 2010-07-14 13:30:36 3
Sort a list of numbers on on line, separated by spaces.

You can replace "sort -nu" with "sort -u" for a word list sorted or "sort -R" for a random-sorted line (edit: corrected) Show Sample Output
This is sample output - yours may be different.
```
$ echo "4 2  3 5  2 52  11" | sed "s/$ \|$$/\n/g" | sort -nu | tr "\n" " "| sed -e "s/^ *//" -e "s/ $//"
2 3 4 5 11 52
```
-1

echo $numbers | sed "s/$ \|$$/\n/g" | sort -nu | tr "\n" " " | sed -e "s/^ *//" -e "s/ $//"

chickenzilla · 2009-06-24 15:12:17 7
Selecting a random file/folder of a folder

Here's a bash version using an array.
This is sample output - yours may be different.
-1

a=(*); echo ${a[$((RANDOM % ${#a[@]}))]}

putnamhill · 2011-03-18 13:24:52 3

This is sample output - yours may be different.

view this page source to copy perl command.

====================
== make alias

$ cat alias.txt # this line is too long to post Command-line-fu
perl -MHTML::Form -MLWP::UserAgent -e'$a=LWP::UserAgent->new;push@{$a->{requests_redirectable}},"POST";$u="http://www.commandlinefu.com/commands/browse";$f=HTML::Form->parse($a->get($u)->content,$u);$f->value(q=>join" ",@ARGV);for($a->request($f->click)->content=~m!<div class="one-liner">(.+?)(?=<div class="one-liner">|</html>)!sg){($s)=m!<div class="summary".+?>(.+?)<!s;($_)=m!<div class="command">\s*(.*?)<!s;s/</</g;s/>/>/g;s/"/"/g;s/&/&/g;print"### $s\n$_\n\n";++$n>7&&last}'

$ alias clgrep=`cat alias.txt`

====================
== grep the archive about "backup"

$ clgrep backup
### quickly backup or copy a file with bash
cp filename{,.bak}

### infile search and replace on N files (including backup of the files)
perl -pi.bk -e's/foo/bar/g' file1 file2 fileN

### backup directory. (for bash)
cp -pr directory-you-want-to-backup{,_`date +%Y%m%d`} # for bash

$ 

====================
== grep the archive about "wget"

$ clgrep wget
### Download all images from a site
wget -r -l1 --no-parent -nH -nd -P/tmp -A".gif,.jpg" http://example.com/images

### Extract tarball from internet without local saving
wget -qO - "http://www.tarball.com/tarball.gz" | tar zxvf -

### Echo the latest commands from commandlinefu on the console
wget -O - http://www.commandlinefu.com/commands/browse/rss 2>/dev/null | awk '/\s*<title/ {z=match($0, /CDATA\[([^\]]*)\]/, b);print b[1]} /\s*<description/ {c=match($0, /code>(.*)<\/code>/, d);print d[1]"\n"} '

### Get My Public IP Address
wget -qO - http://myip.dk/ | egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'

$


====================
== grep recently posted

$ clgrep 
### Launch an Explorer window with a file selected
explorer /select,[file]

### Search specified $TEXT1 and Replace that by specified arg ($TEXT2)
find "$DIR" -regex "$FILENAME" -type f -print0 | xargs -0 sed -i _`date "+%y%m%d%H%M%S"` -E "s/$TEXT1/$TEXT2/g"

### count IPv4 connections per IP
netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | sed s/::ffff:// | cut -d: -f1 | sort | uniq -c | sort -n

$

-1

clgrep keyword

wbx · 2009-02-15 11:45:28 10

simulates the DOS tree command that you might be missing on your Mac or Linux box

NOT MINE! Taken from hackzine.com blog. It creates a tree-style output of all the (sub)folders and (sub)files from the current folder and down(deeper) Quoting some of hackzine's words "Murphy Mac sent us a link to a handy find/sed command that simulates the DOS tree command that you might be missing on your Mac or Linux box. [..split...] Like most things I've seen sed do, it does quite a bit in a single line of code and is completely impossible to read. Sure it's just a couple of substitutions, but like a jack in the box, it remains a surprise every time I run it." Show Sample Output
This is sample output - yours may be different.
```
$ cd amsn_received
$ find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'
.
|____amsn_received
| |____screenshot1.png
| |____DSCF1171.JPG
| |____DSCF1202.JPG
| |____DSC00887.jpg
| |____DSC00953.jpg
| |____DSC00595.JPG
| |____at92A3.tmp.jpg
| |____ReadMe 1.pdf
| |____Screenshot.png
| |____cpuz.html
```
-1

find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'

JesusSuperstar · 2009-03-12 22:25:26 8
Get list of all Apache Virtual Host and which is default for each IP address

Show Sample Output
This is sample output - yours may be different.
```
VirtualHost configuration:
1.2.3.4:80     is a NameVirtualHost
         default server domain.com (/etc/httpd/conf.d/domain_virhost.conf:1)
         port 80 namevhost domain.com (/etc/httpd/conf.d/domain_virhost.conf:1)
Syntax OK
```
-1

httpd -S

flip387 · 2009-08-30 15:28:39 4
Find the uid and gid of your apache process

This command allows you to find the effective uid and gid of the Apache process regardless of process name (which can be apache2 or httpd depending on distro).
This is sample output - yours may be different.
-1

ps -o euid,egid --ppid `netstat --inet --inet6 -pln|awk '/:80 / { split($7,tmp, "/"); print tmp[1]; }'`|sort |uniq|grep -v EUID

chx · 2010-11-18 21:22:29 2

List debian package installed by size

You need to install the package wajig. Show Sample Output

-1

wajig large

log0 · 2009-09-16 22:14:27 3

use vim to get colorful diff output
This is sample output - yours may be different.
-1

vimdiff file1 file2

slappy · 2012-08-24 14:58:37 4
‹ First < 490 491 492 493 494 > Last ›

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Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

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

Open a file with specified application.

This command require mac os x.

List all installed PERL modules by CPAN

This command will give you the detailed information about the installed perl modules i.e. installed path, Link type, version, files etc.

Open screen on the previous command

I often find myself wanting to open screen on whatever command I'm currently running. Unfortunately, opening a fresh screen session spawns a new bash session, which doesn't keep my history, so calling screen directly with the previous command is the only way to go.

Install pip with Proxy

Installs pip packages defining a proxy

Get the weather forecast for the next 24 to 48 for your location.

This shell function grabs the weather forecast for the next 24 to 48 hours from weatherunderground.com. Replace <YOURZIPORLOCATION> with your zip code or your "city, state" or "city, country", then calling the function without any arguments returns the weather for that location. Calling the function with a zip code or place name as an argument returns the weather for that location instead of your default. To add a bit of color formatting to the output, use the following instead: $weather(){ curl -s "http://api.wunderground.com/auto/wui/geo/ForecastXML/index.xml?query=${@:-}"|perl -ne '/([^

Display EPOCH time in human readable format using AWK.

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. ☺)

list block devices

Shows all block devices in a tree with descruptions of what they are.

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