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Print environment information.

Show Sample Output
This is sample output - yours may be different.
```
user@server:~$ perl -e 'print "$_=$ENV{$_}\n" for keys %ENV'
HOME=/home/user
LESS=-R
LC_ALL=de_DE.utf8
EDITOR=/usr/bin/vim
...
```
-1

perl -e 'print "$_=$ENV{$_}\n" for keys %ENV'

sgikas · 2012-11-12 13:14:28 4
Delete Text Editor's Backup
This is sample output - yours may be different.
-1

find . -name "*~" -exec rm {} \;

yasu00000 · 2009-02-06 06:46:30 19
Greets the user appropriately
This is sample output - yours may be different.
-1

echo -e "12 morning\n15 afternoon\n24 evening" | awk '{if ('`date +%H`' < $1) print "Good " $2}'

bazardeur · 2010-09-24 21:15:23 4
convert uppercase to lowercase
This is sample output - yours may be different.
-1

tr '[:upper:]' '[:lower:]' < input.txt > output.txt

jonatasnona · 2013-03-14 19:14:09 6
kerberos authentication
This is sample output - yours may be different.
-1

kinit username

lshmouse · 2010-03-21 13:29:32 3
...if you have sudo access, you could just install ssh-copy-id (Mac users: take note. this is how you install ssh-copy-id )

Mac install ssh-copy-id From there on out, you would upload keys to a server like this: (make sure to double quote the full path to your key) ssh-copy-id -i "/PATH/TO/YOUR/PRIVATE/KEY" username@server or, if your SSH server uses a different port (often, they will require that the port be '2222' or some other nonsense: (note the double quotes on *both* the "/path/to/key" and "user@server -pXXXX"): ssh-copy-id -i "/PATH/TO/YOUR/PRIVATE/KEY" "username@server -pXXXX" ...where XXXX is the ssh port on that server
This is sample output - yours may be different.
-1

sudo curl "http://hg.mindrot.org/openssh/raw-file/c746d1a70cfa/contrib/ssh-copy-id" -o /usr/bin/ssh-copy-id && sudo chmod 755 /usr/bin/ssh-copy-id

misterich · 2012-02-09 20:29:24 5
keep an eye on system load changes
This is sample output - yours may be different.
-1

watch -n 7 -d 'uptime | sed s/.*users?, //'

matthewbauer · 2010-01-17 18:45:52 3
Get DMX disk ID from the ODM database of a DMX attached disk. It is ok for virtual disks.

It will parse the unique_id stanza in ODM database to get the DMX id. Show Sample Output
This is sample output - yours may be different.
```
hdisk0
0x15DC
hdisk1
0x0829
```
-1

odmget -q "attribute=unique_id" CuAt |sed -n 's/.*name = "$.*$"/\1/p;s/.*value = "..........$....$..SYMMETRIX..EMCfcp.*"/0x\1/p;s/.*value =//p'

keymon · 2010-05-14 11:54:04 3
[zsh]: what does 'nyae' mean?

zsh has a powerful correction mechanism. If you type a command in the wrong way it suggests corrections. What happend here is that dir is an unknown command and zsh suggests gdir, while maybe ls was what you wanted. If you want to execute gdir hit y (yes) If you want to try to execute dir anyway hit n (no) If you want to execute completely different spelt command like ls hit a (abort) and type your command If you want to execute a similar spelt commant like udir hit e (edit) and edit your command. Show Sample Output
This is sample output - yours may be different.
```
zsh has a powerful correction mechanism. If you type a command in the wrong way it suggests corrections. What happend here is that dir is an unknown command and zsh suggests gdir, while maybe ls was what you wanted.

If you want to execute gdir hit y (yes)
If you want to try to execute dir anyway hit n (no)
If you want to execute completely different spelt command like ls hit a (abort) and type your command
If you want to execute a similar spelt commant like udir hit e (edit) and edit your command.
```
-1

setopt correct

evandrix · 2012-09-11 01:47:20 5
while true ; do cpulimit -z -p $( pidof cc1 ) -l 5; sleep 1; done
This is sample output - yours may be different.
-1

Limit kernel compilation load

rubenmoran · 2012-11-12 18:04:40 4
find all files of a type which don't match a specific name

Finds all nfo files without the filename movie.nfo and deletes them.
This is sample output - yours may be different.
-1

for output in $(find . ! -name movie.nfo -name "*.nfo") ; do rm $output ; done

analbeard · 2014-04-01 17:41:50 8
change the all files which contains xxxxx to yyyyyy

This script first find all files which contains word xxxxx recursively. Then replace the word xxxxx to yyyyy of the files. Use case: - Web site domain change - Function name change of the program
This is sample output - yours may be different.
-1

grep -r -l xxxxx . | xargs perl -i -pe "s/xxxxx/yyyyy/g"

hassylin · 2009-02-06 08:18:50 18
Loopback mount .iso on FreeBSD

FreeBSD version of the Linux command mount discimg.iso /cdrom -o loop The "mdconfig" command creates a device and prints the name (typically "md0"). Just append that to "/dev/" and mount. Once unmounted, you can unconfigure the device with mdconfig -d -u 0 using "0" for md0, "1" for md1, etc.
This is sample output - yours may be different.
-1

mount -t cd9660 /dev/`mdconfig -a -t vnode -f discimg.iso` /cdrom

mulad · 2009-02-19 06:31:14 5
Add another column printing cumulative sum of entries in first column, sum being less than or equal to 100
This is sample output - yours may be different.
-1

for f in .; do awk 'BEGIN {sum=0;flag=0} {sum=sum+$1; if (flag == 0) { print $1"\t"sum > "cumulative.'$f'" } if (sum > 100) flag=1 }' $f; done

user1234 · 2013-10-05 13:35:30 6
Show best quote from reddit to your terminal

The rsstail is the python version (python-rsstail). The final command pipe it on every new line to gammu and a connected phone rsstail -o -n 1 --f 'RedditQuote: {title}' http://www.reddit.com/r/quotes/new/.rss | while read line; do /usr/bin/gammu --sendsms TEXT +*yournumber* -text "$line"; done Show Sample Output
This is sample output - yours may be different.
```
RedditQuote: ?You're beautiful, but you're empty. No one could die for you.? &#8213; Antoine de Saint-Exup?ry, The Little Prince
```
-1

rsstail -o -n 1 --f 'RedditQuote: {title}' http://www.reddit.com/r/quotes/new/.rss

Youpfu · 2014-01-08 15:33:48 8
shows which files differ in two direcories

--dry-run will only show you which files would be otherwise synced with rsync. -z is for compressio -v vervose -a "as is" - permissions, ownership etc.
This is sample output - yours may be different.
-1

rsync -avz --dry-run /somewhere/source_directory /somewhereelse/target_directory

tsener · 2014-04-01 20:55:59 7
Search through files, ignoring .svn

Unless you have files that include 'svn' in them, this should provide enough information to be useful. If you need to be certain, add the leading dot in the search pattern
This is sample output - yours may be different.
-1

find . | grep -v svn

gwchamb · 2011-01-16 03:51:57 4
Kill an orphan console

when sometimes do a "w" or "who" command and see an orphan console session from time ago, you could kill with this command. where ttyS0 its the console to kill.
This is sample output - yours may be different.
-1

skill -KILL -t ttyS0

jipipayo · 2009-05-26 21:47:33 5
Connect to irssi over ssh

This will launch and irssi session on your server. If it's not running, it will create the session. If it's running it'll connect to it and destroy any other connections. If compositing is available, the rxvt window will have transparency added. This window will also open maximized. Anything else this does should be easily figured out in the man pages.
This is sample output - yours may be different.
-1

rxvt-unicode -g 999x999 -sr -depth 32 -bg rg-ba:0000/0000/0000/dddd +sb -T irssi -n irssi -name irssichat -e ssh server.com -Xt screen -aAdr -RR irssi irssi

MTecknology · 2009-07-30 04:53:17 4
Find packages on Ubuntu/Debian based on their description

Especially useful for latex packages, which are listed in the description of their Ubuntu package E.g. say I want to find the Ubuntu package containing latex package aeguill: aptitude search ~daeguill p texlive-lang-french - TeX Live: French
This is sample output - yours may be different.
-1

aptitude search ~d<string>

junkieDolphin · 2011-08-02 05:19:13 5
checkout directory and the files it contains, without any further subdirectories
This is sample output - yours may be different.
-1

cvs checkout -l project/src/

kev · 2011-09-08 01:34:23 3
sort and show disk space (largest first) with human readable sizes
This is sample output - yours may be different.
-1

du -hs `du -sk * | sort -rn | cut -f2-`

unixmonkey62734 · 2013-07-26 05:34:55 7
print nearest multiples of 100 in a file
This is sample output - yours may be different.
-1

awk 'BEGIN {count=0;prev=-1} {if(count>0) { if(int($1/100) > int(prev/100)) {print $1} } ; prev=$1; count++}' inputFile > rounded

user1234 · 2013-10-05 18:30:08 7
Show total cumulative memory usage of a process that spawns multiple instances of itself
This is sample output - yours may be different.
-1

CMD=chrome ; ps h -o pmem -C $CMD | awk '{sum+=$1} END {print sum}'

pdxdoughnut · 2014-01-08 23:05:09 8
forking a process from gnome-terminal detached from the terminal.

this will open the current directory in nautilus detached from your terminal.
This is sample output - yours may be different.
-1

nohup gnome-open . 0</dev/null 1>/dev/null 2>/dev/null&

drunkcoder · 2010-03-22 07:19:37 4
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Count lines of code across multiple file types, sorted by least amount of code to greatest

Gives you a nice quick summary of how many lines each of your files is comprised of. (In this example, we just check .c, .h, .php and .pl). Since we just use wc -l to count, you'll just get a very rough estimate of how many lines of actual code there are. Use a more sophisticated algorithm instead if you need to.

Get full URL via http://untr.im/api/ajax/api

Get full url via untr.im

Browse shared folder when you're the only Linux user

Under Ubuntu smbclient is part of the samba package. With the version I use (3.0.28a) cd-ing into folders with spaces in the name is a drag. You have to put the folder name in quotes: smb: \Shared\> cd "Marketing and PR"

Zip each file in a directory individually with the original file name

This will list the files in a directory, then zip each one with the original filename individually. video1.wmv -> video1.zip video2.wmv -> video2.zip This was for zipping up large amounts of video files for upload on a Windows machine.

Pimp your less

# s = combine multiple lines of whitespace into 1 # x4 = set the tabstop to 4 instead of 8 # F = Exit if the output fits on 1 screen. This is similar to git diff # R = Raw control chars. This allows you to pipe colordiff straight to less. ie: alias sdi="svn diff | colordiff | less" # S = Chop off long lines # X = Dont send termcap init and deinit scrings to the terminal

Create a new file

Get me yesterday's date, even if today is 1-Mar-2008 and yesterday was 29-Feb-2008

Fool date by setting the timezone out by 24 hours and you get yesterday's date. Try TZ=XYZ-24 to get tomorrow's date. I live in TZ=GMT0BST so you might need to shift the number 24 by the hours in your timezone.

Download and extract a *tar.gz file with curl.

Stream audio over ssh

This one doesn't need to convert to wav.

Display the definition of a shell function

Display the code of a previously defined shell function.

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