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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 9
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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Expand shortened URLs

curl(1) is more portable than wget(1) across Unices, so here is an alternative doing the same thing with greater portability. This shell function uses curl(1) to show what site a shortened URL is pointing to, even if there are many nested shortened URLs. This is a great way to test whether or not the shortened URL is sending you to a malicious site, or somewhere nasty that you don't want to visit. The sample output is from: $ expandurl http://t.co/LDWqmtDM

uniq without pre-sorting

Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.

Set all CPU cores' CPU frequency scaling governor to maximum performance

Sum columns from CSV column $COL

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"

Monitor memory fine-grained usage (e.g. firefox)

Sometimes top/htop don't give the fine-grained detail on memory usage you might need. Sum up the exact memory types you want

Remote copy directories and files through an SSH tunnel host

If you have lots of remote hosts sitting "behind" an ssh proxy host, then there is a special-case use of "rsynch" that allows one to easily copy directories and files across the ssh proxy host, without having to do two explicit copies: the '-e' option allows for a replacement "rsh" command. We use this option to specify an "ssh" tunnel command, with the '-A' option that causes authentication agent requests to be forwarded back to the local host. If you have ssh set up correctly, the above command can be done without any passwords being entered.

Upload folder to imageshack.us (forum)

Each file in the current folder is uploaded to imageshack.us If the folder contains other filetypes change: $for files in * to: $for files in *.jpg (to upload ONLY .jpg files) Additionally you can try (results may vary): $for files in *.jpg *.png The output URL is encased with BB image tags for use in a forum.

Combine cssh and shell expansion to execute commands on a large cluster

This will open an awful lot of little windows, but is quite useful if you want to quickly patch something on a cluster of servers.

Download streaming video in mms

require mimms package

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