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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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What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Colorize matching string without skipping others

this is useful to highlight only some code without losing other lines (eg. software, logs, scripts)

Monitor incoming connections of proxies and balancers.

Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking.

du with colored bar graph

i'm using gawk, you may get varying mileage with other varieties. You might want to change the / after du to say, /home/ or /var or something, otherwise this command might take quite some time to complete. Sorry it's so obsfucated, I had to turn a script into a one-liner under 255 characters for commandlinefu. Note: the bar ratio is relative, so the highest ratio of the total disk, "anchors" the rest of the graph. EDIT: the math was slightly wrong, fixed it. Also, made it compliant with older versions of df.

Sort output by column

(separator = $IFS)

Recursively grep thorugh directory for string in file.

-R, -r, --recursive Read all files under each directory, recursively; this is equivalent to the -d recurse option.

Install pip with Proxy

Installs pip packages defining a proxy

save date and time for each command in history

for the change stay in your history file , export command by writing it into your .bashrc

File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Find out current working directory of a process

This is an alternative to another command using two xargs. If it's a command you know there's only one of, you can just use: $ ls -l /proc/$(pgrep COMMAND)/cwd

Check executable shared library usage

provides list of shared libraries required by executable

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