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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

Fork Bomb for Windows
This is sample output - yours may be different.
-1

%0 | %0

imjoseangel · 2017-05-17 14:17:01 22
plink ssh connect
This is sample output - yours may be different.
-1

plink lyu0@mysshserver -pw 123456

yulin724 · 2009-02-07 13:53:37 10
Enable V4l2 Webcams

Cheese or other webcam software not working? Try this.
This is sample output - yours may be different.
-1

gst-launch v4l2src

samliu · 2009-03-23 05:45:00 4
Purgue foreing architecture packages on debian
This is sample output - yours may be different.
-1

dpkg -l |grep i386 | awk '{ print "apt-get -y remove --purge "$2 }' | sh

rubenmoran · 2013-03-23 19:19:24 5
Get Minecraft ≥1.7 Server info (online players etc.) JSON
This is sample output - yours may be different.
-1

(echo -e '\x06\x00\x00\x00\x00\x00\x01\x01\x00'; sleep 1)|nc -c $host 25565

tehdog · 2014-08-05 14:44:40 13
List files that DO NOT match a pattern
This is sample output - yours may be different.
-1

ls | grep -vi pattern

haivu · 2009-11-24 20:39:53 5
Select MacOSX Network Location

Use this command to change your network location from the OSX command line.
This is sample output - yours may be different.
-1

scselect <location>

gwchamb · 2011-01-26 03:56:14 3
Install a remote RPM
This is sample output - yours may be different.
-1

sudo rpm -if "http://rpm_server/rpm_repo/this-app.rpm"

igorfu · 2011-05-23 08:19:15 6
Show only printable characters and newlines from a file or input

Use this like the cat command with the additional feature to strip out unprintable characters from the input, newlines will stay. Show Sample Output
This is sample output - yours may be different.
```
#strings -1 /dev/urandom
7xuP
fZ#%
K(0np
5lQ1
J*P"
5D#&%\
1hI{
S,
h>3/
iO.2
0%]~
BTLn.
p       `vfa
EB,m*
%&l*
Bi&o
l{u,$
FRF]
].`
Knr!tI
```
-1

strings -1 <file>

Testuser_01 · 2012-11-23 11:33:25 8
Rename all the files in the current directory into their sha1sum
This is sample output - yours may be different.
-1

find . -maxdepth 1 -type f| xargs sha1sum | sed 's/^$\w*$\s*$.*$/\2 \1/' | while read LINE; do mv $LINE; done

foremire · 2010-01-25 20:21:01 11
bored of listing files with ls wanna see them in file browser in gnome try this

when working under a cli sometime you need to list the files with ls but u can open gnome file browser with the command 'gnome-open .' under current directory
This is sample output - yours may be different.
-1

gnome-open .

pahnin · 2010-10-01 13:16:00 9
Call remote web service

Use curl to invoke remote web service, where the file 'XML' is the soap payload
This is sample output - yours may be different.
-1

curl -D - -X POST -H 'Content-type: text/xml' -d @XML http://remote_server:8080/web-service/soap/WSName

igorfu · 2011-05-23 08:25:24 3
Place the argument of the most recent command on the shell

using "!$" will save another ton of typing than 'ALT+.' or ' .' Show Sample Output
This is sample output - yours may be different.
```
$cd /usr/local/

$echo !$
/usr/local/
 
```
-1

cd !$

YCFlame · 2010-08-26 08:51:01 3
Restore accents in vi & others

French uses accents (???...) which may be badly displayed on computers with the wrong default character set. This command may help (sometimes)
This is sample output - yours may be different.
-1

LANG=fr_FR@euro

igorfu · 2011-05-23 08:27:22 3
Once Guest Additions are installed (Virtualbox), we need to make sure that the various components of this software are loaded automatically each time the system boots.

To do this, we?ll use nano to create a new configuration file called ?virtualbox.conf?. This file will go in the ?/etc/modules-load.d? directory, which contains files that need to be loaded when Arch boots up. Since adding a file to this directory requires administrative permissions, we?ll need to precede our command with ?sudo? once again. When nano brings up the blank file, add these three lines to it: vboxguest vboxsf vboxvideo As usual, when you?re finished entering text in nano, type Control-X to exit to the command line, and answer ?y? for yes when you?re asked whether you want to save your work, and then hit ?Return? to accept the filename. At this point, reboot your machine for the Guest Additions to take effect.
This is sample output - yours may be different.
-1

sudo nano /etc/modules-load.d/virtualbox.conf

unixmonkey57489 · 2013-05-16 14:41:51 9
Initialise git in working directory with latest Visual Studio .gitignore [Windows]
This is sample output - yours may be different.
-1

git init; (Invoke-WebRequest https://raw.githubusercontent.com/github/gitignore/master/VisualStudio.gitignore -UseBasicParsing).Content | Out-File -FilePath .gitignore -Encoding utf8; git add -A

RaphHaddad · 2019-07-22 06:24:33 488
Prints per-line contribution per author for a GIT repository

You'll run into trouble if you have files w/ missing newlines at the end. I tried to use PAGER='sed \$q' git blame and even PAGER='sed \$q' git -p blame to force a newline at the end, but as soon as the output is redirected, git seems to ignore the pager.
This is sample output - yours may be different.
-1

git ls-files | while read i; do git blame $i | sed -e 's/^[^(]*(//' -e 's/^$[^[:digit:]]*$[[:space:]]\+[[:digit:]].*/\1/'; done | sort | uniq -ic | sort -nr

pipping · 2009-10-25 09:40:01 4
Search git repo for specified string

Based on: http://stackoverflow.com/questions/746684/how-to-search-through-all-commits-in-the-repository It would be good if anyone can shorten this to eliminate the duplicate query string. Show Sample Output
This is sample output - yours may be different.
```
018dcc7:library/My/View/Helper/JQuery/AjaxPagination.php:$('#progressor').remove();
018dcc7:public/themes/default/css/aaa.css:#progressor {
5a3ea4f:library/My/View/Helper/JQuery/AjaxPagination.php:$('#progressor').remove();
5a3ea4f:public/themes/default/css/aaa.css:#progressor {
ec71299:library/My/View/Helper/JQuery/AjaxPagination.php:$('#progressor').remove();
ec71299:public/themes/default/css/aaa.css:#progressor {
```
-1

git grep "search for something" $(git log -g --pretty=format:%h -S"search for something")

takeshin · 2010-08-26 12:05:45 4
Send an email using the mutt email client

It's very similar to this thread: http://www.commandlinefu.com/commands/view/4317/send-a-local-file-via-email mutt your@email_address.com -s "Message Subject Here" -a attachment.jpg </dev/null
This is sample output - yours may be different.
-1

M=bob@example.com; echo "Email message" | mutt -s "Email Subject" $M

igorfu · 2011-05-23 08:31:14 11
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 this command to reboot the pc in linux
This is sample output - yours may be different.
-1

sudo reboot

unixmonkey57489 · 2013-05-16 14:43:41 8
Create a CD/DVD ISO image from disk.

This example is taken from Cygwin running on Win7Ent-64. Device names will vary by platform. Both commands resulted in identical files per the output of md5sum, and ran in the same time down to the second (2m45s), less than 100ms apart. I timed the commands with 'time', which added before 'dd' or 'readom' gives execution times after the command completes. See 'man time' for more info...it can be found on any Unix or Linux newer than 1973. Yeah, that means everywhere. readom is supposed to guarantee good reads, and does support flags for bypassing bad blocks where dd will either fail or hang. readom's verbosity gave more interesting output than dd. On Cygwin, my attempt with 'readom' from the first answer actually ended up reading my hard drive. Both attempts got to 5GB before I killed them, seeing as that is past any CD or standard DVD. dd: 'bs=1M' says "read 1MB into RAM from source, then write that 1MB to output. I also tested 10MB, which shaved the time down to 2m42s. 'if=/dev/scd0' selects Cygwin's representation of the first CD-ROM drive. 'of=./filename.iso' simply means "create filename.iso in the current directory." readom: '-v' says "be a little noisy (verbose)." The man page implies more verbosity with more 'v's, e.g. -vvv. dev='D:' in Cygwin explicitly specifies the D-drive. I tried other entries, like '/dev/scd0' and '2,0', but both read from my hard drive instead of the CD-ROM. I imagine my LUN-foo (2,0) was off for my system, but on Cygwin 'D:' sort of "cut to the chase" and did the job. f='./filename.iso' specifies the output file. speed=2 simply sets the speed at which the CD is read. I also tried 4, which ran the exact same 2m45s. retries=8 simply means try reading a block up to 8 times before giving up. This is useful for damaged media (scratches, glue lines, etc.), allowing you to automatically "get everything that can be copied" so you at least have most of the data. Show Sample Output
This is sample output - yours may be different.
```
sharkins@L7EIS-TEL023 /cygdrive/c/Zip/HP/USB HD 720p Business Webcam
$ time readom -v dev='D:' f='./HP-HD-2200_ViaReadom-Take3.iso' speed=2 retries=8
scsidev: 'D:'
devname: 'D'
scsibus: -1 target: -1 lun: -1
Read  speed:  1764 kB/s (CD  10x, DVD  1x).
Write speed:     0 kB/s (CD   0x, DVD  0x).
Capacity: 59379 Blocks = 118758 kBytes = 115 MBytes = 121 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (2,0,0) disk to file './HP-HD-2200_ViaReadom-Take3.iso'
end:     59379
addr:    59379 cnt: 14
Time total: 165.562sec
Read 118758.00 kB at 717.3 kB/sec.

real    2m45.742s
user    0m0.062s
sys     0m0.420s


sharkins@L7EIS-TEL023 /cygdrive/c/Zip/HP/USB HD 720p Business Webcam
$ time dd bs=1M if=/dev/scd0 of=./HP-HD-2200_Via_dd.iso
115+1 records in
115+1 records out
121608192 bytes (122 MB) copied, 165.575 s, 734 kB/s

real    2m45.665s
user    0m0.015s
sys     0m0.062s


sharkins@L7EIS-TEL023 /cygdrive/c/Zip/HP/USB HD 720p Business Webcam
$ md5sum *
f42303c3b030a0e528c3d28bb80683a9 *HP-HD-2200_Via_dd.iso
f42303c3b030a0e528c3d28bb80683a9 *HP-HD-2200_ViaReadom-Take3.iso
```
-1

dd bs=1M if=/dev/scd0 of=./filename.iso OR readom -v dev='D:' f='./filename.iso' speed=2 retries=8

scotharkins · 2013-10-23 15:53:27 6
Delete all local branches that have been merged into master [Windows]
This is sample output - yours may be different.
-1

git branch --merged origin/master | Where-Object { !$_.Contains('master') } | ForEach-Object { git branch -d $_.trim() }

RaphHaddad · 2019-07-22 06:24:55 239
Block an IP address

Thanks to http://www.cyberciti.biz/faq/how-do-i-block-an-ip-on-my-linux-server/
This is sample output - yours may be different.
-1

iptables -A INPUT -s 65.55.44.100 -j DROP

igorfu · 2011-05-23 08:32:47 4
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check open ports without netstat or lsof

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"

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"

Print all commands of a user on commandlinefu.com

This utilizes the Requests and BeautifulSoup libraries in Python to retrieve a user page on commandlinefu, parse it (error-tolerant) and extract all the lines of the following format: gzip * To print them, a list comprehension is used to iterate over the values, and join() is called on a newline character.

Using the urxvt terminal daemon

- for .xsession use - Advantages of running a urxvt daemon include faster creation time for terminal windows and a lot of saved memory. You can start new terminals as childs of urxvtd by typing urxvtc. Another advantage is, that background jobs are always owned by the urxvtd and will survive as long the daemon is running.

Shows users and 'virtual users' on your a unix-type system

Shows a list of users that currently running processes are executing as. YMMV regarding ps and it's many variants. For example, you might need: $ ps -axgu | cut -f1 -d' ' | sort -u

Fetch the current human population of Earth

FizzBuzz in one line of Bash

The (in)famous "FizzBuzz" programming challenge, answered in a single line of Bash code. The "|column" part at the end merely formats the output a bit, so if "column" is not installed on your machine you can simply omit that part. Without "|column", the solution only uses 75 characters. The version below is expanded to multiple lines, with comments added. for i in {1..100} # Use i to loop from "1" to "100", inclusive. do ((i % 3)) && # If i is not divisible by 3... x= || # ...blank out x (yes, "x= " does that). Otherwise,... x=Fizz # ...set x to the string "Fizz". ((i % 5)) || # If i is not divisible by 5, skip (there's no "&&")... x+=Buzz # ...Otherwise, append (not set) the string "Buzz" to x. echo ${x:-$i} # Print x unless it is blanked out. Otherwise, print i. done | column # Wrap output into columns (not part of the test).

Installing debian on fedora (chrooted)

Your name backwards

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