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get one field inside another that is delimited by space
This is sample output - yours may be different.
-2

cut -f2 file.txt | cut -d " " -f1

eastwind · 2010-03-15 08:01:02 4
Automatd ssh public key setup without ssh-copy-id

Some servers don't have ssh-copy-id, this works in those cases. It will ask for the destination server, this can be IP, hostname, or user@hostname if different from current user. Ssh keygen will let you know if a pubkey already exists on your system and you can opt to not overwrite it.
This is sample output - yours may be different.
-2

echo 'Host or User@Host?:'; read newserver && ssh-keygen -N "" -t rsa -f ~/.ssh/id_rsa ; ssh $newserver cat <~/.ssh/id_rsa.pub ">>" ~/.ssh/authorized_keys ; ssh $newserver

alf · 2010-05-07 06:24:53 4
Get the /dev/disk/by-id fragment for a physical drive

This was tested on Ubuntu 12.04 (Precise) LTS Server. It returns the name of the symlink within /dev/disk/by-id for the physical drive you specify. Change /dev/sda to the one you want, and replace ata- with scsi- or the appropriate type for your drive. I used this to pre-configure grub-pc during a non-interactive install because I had to tell it which disk to install grub on, and physical disks don't have a UUID such as that blkid provides.
This is sample output - yours may be different.
-2

ls -l /dev/disk/by-id | egrep ata-.*`hdparm -i /dev/sda | grep SerialNo | sed 's/.*SerialNo=//' | tr -d "\n"`.*sda$ | sed -e 's/.*ata-/ata-/' -e 's|[ ].*||' | tr -d "\n"

wizonesolutions · 2013-01-07 10:20:25 6
bash / vim workflow

355 # from zsh-users 356 edit_command_line () { 357 # edit current line in $EDITOR 358 local tmpfile=${TMPPREFIX:-/tmp/zsh}ecl$$ 359 360 print -R - "$PREBUFFER$BUFFER" >$tmpfile 361 exec 362 ${VISUAL:-${EDITOR:-vi}} $tmpfile 363 zle kill-buffer 364 BUFFER=${"$( 365 CURSOR=$#BUFFER 366 367 command rm -f $tmpfile 368 zle redisplay 369 } 370 zle -N edit_command_line
This is sample output - yours may be different.
-2

zsh$ M-v

bucciarati · 2009-11-10 23:02:56 11
Random Cyanide and Happiness comics from explosm.net

Random Cyanide and Happiness comics from explosm.net. I use this command http://www.commandlinefu.com/commands/view/3477/random-xkcd-comic and update it for explosm.net --edit : modification for *.jpeg files + guest authors
This is sample output - yours may be different.
-2

cyanide(){ display "$(wget -q http://explosm.net/comics/random/ -O - | grep -Po 'http://www.explosm.net/db/files/Comics/*/[^"]+(png|jpg|jpeg)')"; }

barbuk · 2011-02-14 15:12:13 5
Arguments too long
This is sample output - yours may be different.
-2

ls | grep ".txt$" | xargs -i WHATEVER_COMMAND {}

4Aiur · 2014-03-12 14:56:12 8
Takes a multi line df or bdf and turns it into just one line
This is sample output - yours may be different.
-2

bdf | awk '(NF<5){f=$1; next} (NF>5){f=$1} {print f, $2, $3, $NF}'

dcarlisle · 2009-02-15 22:54:52 11
Lists the size of certain file in every 10 seconds

This command produces the output of "du -sk testfile" in every 10 seconds. You can change the command to be whatever you want.
This is sample output - yours may be different.
-2

while true ; do du -sk testfile ; sleep 10 ; done

Solaris · 2009-08-14 11:39:52 5
List files in tarballs

The magic is performed by the parameter -t Show Sample Output
This is sample output - yours may be different.
```
[alchandia@localhost Cacti]$ tar -tvzf cacti-iostat-1.3.tgz
drwxr-xr-x alchandia/users    0 2009-05-18 06:02:27 cacti-iostat-1.3/
drwxr-xr-x alchandia/users    0 2009-05-18 06:02:27 cacti-iostat-1.3/scripts/
-rwxr-xr-x alchandia/users 5087 2009-05-18 06:02:12 cacti-iostat-1.3/scripts/iostat.pl
```
-2

for F in $(find ./ -name "*.tgz") ; do tar -tvzf $F ; done

alchandia · 2009-11-11 00:50:52 3
List files with quotes around each filename

I had a file named " " (one space) and needed a way to see what the real filename was so I could remove it. sed to the rescue. Show Sample Output
This is sample output - yours may be different.
```
"foo"
"bar "
" "
```
-2

ls | sed 's,$.*$,"\1",'

randy909 · 2010-08-17 14:27:27 4
sshdo, an alternative to sudo

Run program as root by SSH key forwarding instead of sudoers. Put this alias line in .bashrc or wherever you like. Alias arguments might need extra escaping. You might wonder about security. But you'd block out root login as much as possible of course. In sshd_config you put this: PermitRootLogin no Match Address 127.0.0.1 PermitRootLogin without-password
This is sample output - yours may be different.
-2

alias sshdo='ssh -q -t root@localhost -- cd $PWD \&\& sudo'

darkfader · 2010-10-20 22:33:22 8
start a nested awesome session

alternatives: xinit $(which gnome-awesome-session) with cat /usr/local/bin/gnome-awesome-session: #!/bin/bash exec gnome-session --session awesome "$@" following: http://awesome.naquadah.org/wiki/Quickly_Setting_up_Awesome_with_Gnome note: in ubuntu 12.10 a probable Xephyr recent bug rejects keybd option ... Show Sample Output
This is sample output - yours may be different.
```
an "awesome" session ;)
```
-2

xinit $(which awesome) -- /usr/bin/Xephyr :5 -once -fullscreen -ac -keybd "ephyr,,,xkbmodel=pc105,xkblayout=it,xkbrules=evdev,xkboption="

hute37 · 2012-11-03 00:54:33 4
Have a random

To install on centos 6.2 for Centos auto accept: yum install fortune* -y yum install cowsay* -y Removed the -f command as I dont know how, but it works without it. Almost the same but one folder higher =).
This is sample output - yours may be different.
-2

fortune | cowsay $(ls/usr/share/cowsay | shuf -n1)

cablegunmaster · 2014-10-23 10:09:44 9
Shuffles your songs. Using mplayer. But with no output.
This is sample output - yours may be different.
-2

mplayer -shuffle $HOME/music/* $HOME/Dropbox/Music/*/* $HOME/Dropbox/Music/*/*/* etc. >> /dev/null 2>&1

TheShadowFog · 2011-11-10 20:48:45 3
Batch resize images (overwriting)

Resize all png in the current folder. Warning: no copy. Make sure you have a copy of the originals
This is sample output - yours may be different.
-2

for f in *.png; do convert $f -resize 852x480 $f; done

egeoffray · 2013-12-15 11:28:07 12
Make alert if host is 'dead' or not reachable

Every 20 minutes ping host with IP address 192.168.0.14. If it's not 'alive' or not reachable, then display something eye-catching (here xeyes) on the desktop. Hint for newbies: edit crontab with crontab -e
This is sample output - yours may be different.
-2

10,30,50 * * * * ping -q -c1 -w3 192.168.0.14 | grep '1 received' - || env DISPLAY=:0 xeyes

knoppix5 · 2012-02-06 09:40:11 3
Extract .daa files with PowerISO

.daa is a non-standard disk image format that can not be read by any other program. This is how you can extract the files though. PowerISO binary for Linux: http://www.poweriso.com/poweriso-1.3.tar.gz "This is a free utility for linux which can extract, list, and convert image files (including ISO, BIN, DAA, and other formats). Type " poweriso -? " for detailed usage information. File Size: 278KB"
This is sample output - yours may be different.
-2

./poweriso extract $USER/file.daa / -od $USER/file_extracted

brettalton · 2009-02-15 23:19:40 10
Scan for viruses

Scan for viruses, recursively and print only infected files, with bell sound. Clamscan is part of clamav package. Tested on Debian.
This is sample output - yours may be different.
-2

clamscan -ir --bell ~user/

servermanaged · 2009-05-21 13:09:31 30
Get My Public IP Address
This is sample output - yours may be different.
-2

curl http://whatismyip.org

j_melis · 2010-10-21 10:10:00 3
Undo

Undo (sh, bash, tcsh)
This is sample output - yours may be different.
-2

[Ctrl+u]

PhillipNordwall · 2010-11-19 20:27:42 6
Edit all "text" files (exclude binary and directories) in the current directory
This is sample output - yours may be different.
-2

ls . | xargs file | grep text | sed "s/$.*$:.*/\1/" | xargs gedit

matthewbauer · 2010-02-08 02:06:40 6
List alive hosts in specific subnet
This is sample output - yours may be different.
-2

for i in 192.168.1.{1..254} ; do if ping -c1 -w1 $i &>/dev/null; then echo $i alive; fi; done

wiburg · 2010-06-12 18:38:36 3
git log -n 1 -p FILENAME| head -n 1 | awk -F " " '{print $2}'
This is sample output - yours may be different.
-2

git last commit on a file.

joeyrobert · 2010-11-19 23:17:13 4
Real full backup copy of /etc folder
This is sample output - yours may be different.
-2

tar -cf - /etc | tar -xf - -C </destination/folder>

vtrone · 2011-10-06 19:31:58 3
Get the date for the last Saturday of a given month

This is a little trickier than finding the last Sunday, because you know the last Sunday is in the first position of the last line. The trick is to use the NF less than or equal to 7 so it picks up all the lines then grep out any empty lines. Show Sample Output
This is sample output - yours may be different.
```
28
```
-2

cal 04 2012 | awk 'NF <= 7 { print $7 }' | grep -v "^$" | tail -1

javidjamae · 2012-05-03 16:57:45 764
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Look up the definition of a word

A bash function might also be useful: $ dict() { curl dict://dict.org/d:$1; } Or if you want less verbose output: $ dict() { curl -s dict://dict.org/d:$1 | perl -ne 's/\r//; last if /^\.$/; print if /^151/../^250/'; }

Grep syslog today last hour

Uses date to grep de logfile for today and uses it to get the last hour logs. Can be used to get last minute logs or today's logs.

get you public ip address

View Processeses like a fu, fu

I don't truly enjoy many commands more than this one, which I alias to be ps1.. Cool to be able to see the heirarchy and makes it clearer what need to be killed, and whats really going on.

Pipe stdout and stderr, etc., to separate commands

You can use [n]> combined with >(cmd) to attach the various output file descriptors to be the input of different commands.

Blue Matrix

Same as original, but works in bash

Start a local web server in the current directory on a random dynamic port.

Shell function to exit script with error in exit status and print optional message to stderr

USAGE: die ERRNUM [MESSAGE]

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

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"

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