All commands

All commands (14,187)

sorted by

Find removed files still in use via /proc

Oracle DBA remove some logfiles which are still open by the database and he is complaining the space has not been reclaimed? Use the above command to find out what PID needs to be stopped. Or alternatively recover the file via: cp /proc/pid/fd/filehandle /new/file.txt Show Sample Output

find -L /proc/*/fd -links 0 2>/dev/null

res0nat0r · 2009-06-26 18:42:51 12

Show your account and windows policy settings with Results of Policy msc.

Type this into windows via run and it will display to you your complete policy for windows. This includes group policy, security policy and your active directory account (min password etc).... www.fir3net.com
This is sample output - yours may be different.
4

rsop.msc

felix001 · 2009-06-26 11:19:50 13

Monitor RX/TX packets and any subsquent errors

www.fir3net.com Show Sample Output

watch 'netstat -aniv'

felix001 · 2009-06-26 11:16:42 8

Most simple way to get a list of open ports
This is sample output - yours may be different.
3

netstat -lnp

unixmonkey4415 · 2009-06-26 08:33:03 8
Check processes runed not by you
This is sample output - yours may be different.
-4

ps aux | grep -v `whoami`

unixmonkey4415 · 2009-06-26 08:28:06 8
Merge several pdf files into a single file
This is sample output - yours may be different.
3

pdftk $* cat output $merged.pdf

svg · 2009-06-26 07:36:02 11
bash or tcsh redirect both to stdout and to a file

When plumbers use pipes, they sometimes need a T-joint. The Unix equivalent to this is 'tee'. The -a flag tells 'tee' to append to the file, rather than clobbering it. Tested on bash and tcsh. Show Sample Output
This is sample output - yours may be different.
```
$ echo "Hello World." | tee -a hello.txt
Hello World.
$ cat hello.txt
Hello World.
```
1

echo "Hello World." | tee -a hello.txt

thebillywayne · 2009-06-26 00:55:59 9
Print multiline text starting and ending at specific regexps with perl

Using perl, here, we grep the man page of fetchmail to find the paragraph starting with '-k | --keep' and ending before the paragraph starting with '-K | --nokeep' Show Sample Output
This is sample output - yours may be different.
```
-k | --keep
              (Keyword:  keep)  Keep  retrieved messages on the remote mailserver.  Normally, messages are deleted from the folder on the mailserver after they have been retrieved.  Specifying
              the keep option causes retrieved messages to remain in your folder on the mailserver.  This option does not work with ETRN or ODMR. If used with POP3, it is recommended  to  also
              specify the --uidl option or uidl keyword.

       
```
0

man fetchmail | perl -ne 'undef $/; print $1 if m/^.*?(-k \| --keep.*)-K \| --nokeep.*$/smg'

unixmonkey4437 · 2009-06-25 23:51:35 10
Set an alarm to wake up [2]

Set an alarm to starts in specific time. Show Sample Output
This is sample output - yours may be different.
```
For instance:
echo "aplay /media/dados/audio/geral/Yahoo.wav" | at 16:28
```
8

echo "aplay path/to/song" |at [time]

brausen · 2009-06-25 19:33:37 12
Set an alarm to wake up

Sleep 5h and plays the song as a wake up alarm
This is sample output - yours may be different.
3

sleep 5h && rhythmbox path/to/song

becomingGuru · 2009-06-25 19:15:19 12
Merge several pdf files into a single file

merge a.pdf b.pdf and c.pdf and create ./out.pdf
This is sample output - yours may be different.
5

gs -q -sPAPERSIZE=a4 -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=out.pdf a.pdf b.pdf c.pdf

becomingGuru · 2009-06-25 19:04:28 14
Get a shell with a not available account

Show Sample Output
This is sample output - yours may be different.
```
[root@XXX ~]# su - nobody
This account is currently not available.
[root@XXX ~]# su - nobody -s /bin/sh -c "/bin/sh"
sh-3.2$ id
uid=99(nobody) gid=99(nobody) grupos=99(nobody) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
```
3

su - <user> -s /bin/sh -c "/bin/sh"

nablas · 2009-06-25 15:36:04 12
Scan Network for Rogue APs.

I've used this scan to sucessfully find many rogue APs on a very, very large network. Show Sample Output
This is sample output - yours may be different.
```
Outputs data in greppable format, plain text and XML. The XML output has an associated XSL stylesheet, which allows you to open the data in a browser. 
```
7

nmap -A -p1-85,113,443,8080-8100 -T4 --min-hostgroup 50 --max-rtt-timeout 2000 --initial-rtt-timeout 300 --max-retries 3 --host-timeout 20m --max-scan-delay 1000 -oA wapscan 10.0.0.0/8

merkmerc · 2009-06-25 14:12:26 8
Open a Remote Desktop (RDP) session with a custom resolution.

Using a widescreen monitor, I often get annoyed that the RDP window is too high, or too narrow for what I want to display. In this example, I'm on a 1680 x 1050 display.
This is sample output - yours may be different.
1

mstsc /w:1500 /h:900 /v:www.example.com

merkmerc · 2009-06-25 14:01:42 9

get linkspeed, ip-adress, mac-address and processor type from osx

get desired info from machine and pipe it txt file. Show Sample Output

-2

echo "-------------" >> nicinfo.txt; echo "computer name x" >> nicinfo.txt; ifconfig | grep status >> nicinfo.txt; ifconfig | grep inet >> nicinfo.txt; ifconfig | grep ether >> nicinfo.txt; hostinfo | grep type >> nicinfo.txt;

miccaman · 2009-06-25 12:32:37 31

Disable graphical login on Solaris

With a full installation of Solaris 10, the graphical login and desktop will start by default. This command will disable that feature. To enable it again use: /usr/dt/bin/dtconfig -e Show Sample Output
This is sample output - yours may be different.
```
done 
desktop auto-start disabled. 
```
1

/usr/dt/bin/dtconfig -d

thesuperjason · 2009-06-25 09:32:37 8
Adobe Updater Crashes on Mac OS X Fix

adobe updater keeps popping up. (normal update fails, probably due to insufficient rights) (src: http://aricsblog.blogspot.com/2007/12/adobe-updater-crashes-on-mac-os-x-and.html)
This is sample output - yours may be different.
-9

sudo /Applications/Utilities/Adobe\ Utilities.localized/Adobe\ Updater5/Adobe\ Updater.app/Contents/MacOS/Adobe\ Updater

miccaman · 2009-06-25 08:07:47 18
Search command history on bash

Very handy and time-saving. Do a 'ctrl+ r' on command prompt. You will see a "(reverse-i-search)`':" mark. Just type any sub-string of the command you want to search(provided you have used it sometime in the same session). Keep on searching by repeatedly pressing ctrl+r. Press enter once you get the desired command string. Show Sample Output
This is sample output - yours may be different.
```
blue] $
(reverse-i-search)`': ls

#Press enter to run the selected command.
```
9

ctrl + r

Bluehive · 2009-06-25 06:51:38 12
Update dyndns.org with your external IP.

This is great if you are behind a router that does not support dynamic dns updates! Example: AT&T u-verse gateway... Put this in a script and run it as a cron job.
This is sample output - yours may be different.
5

curl -v -k -u user:password "https://members.dyndns.org/nic/update?hostname=<your_domain_name_here>&myip=$(curl -s http://checkip.dyndns.org | sed 's/[a-zA-Z<>/ :]//g')&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG"

din7 · 2009-06-24 17:00:15 15
Sort a list of numbers on on line, separated by spaces.

You can replace "sort -nu" with "sort -u" for a word list sorted or "sort -R" for a random-sorted line (edit: corrected) Show Sample Output
This is sample output - yours may be different.
```
$ echo "4 2  3 5  2 52  11" | sed "s/$ \|$$/\n/g" | sort -nu | tr "\n" " "| sed -e "s/^ *//" -e "s/ $//"
2 3 4 5 11 52
```
-1

echo $numbers | sed "s/$ \|$$/\n/g" | sort -nu | tr "\n" " " | sed -e "s/^ *//" -e "s/ $//"

chickenzilla · 2009-06-24 15:12:17 7
Check if network cable is plugged in and working correctly

with 'mii-tool -w eth0' you can watch the interface for changes of the link status Show Sample Output
This is sample output - yours may be different.
```
eth0: negotiated 100baseTx-FD, link ok
```
6

mii-tool eth0

flart · 2009-06-24 08:43:55 11
String Capitalization

Helpful when we want to do mass file renaming(especially mp3s). Show Sample Output
This is sample output - yours may be different.
```
$ (STRING="COmManDLinEfU"; echo "${STRING}" | tr '[A-Z]' '[a-z]' | awk '{print toupper(substr($0,1,1))substr($0,2);}')
Commandlinefu
```
0

echo "${STRING}" | tr '[A-Z]' '[a-z]' | awk '{print toupper(substr($0,1,1))substr($0,2);}'

mohan43u · 2009-06-23 21:11:34 119
Size(k) of directories(Biggest first)

somewhat faster version to see the size of our directories. Size will be in Kilo Bytes. to view smallest first change '-k1nr' to '-k1n'.
This is sample output - yours may be different.
4

find . -depth -type d -exec du -s {} \; | sort -k1nr

mohan43u · 2009-06-23 20:52:35 11
Get the canonical, absolute path given a relative and/or noncanonical path

readlink -f accepts a relative, noncanonical path and emits the corresponding canonical, absolute path. Show Sample Output
This is sample output - yours may be different.
```
/tmp/foo/bar/baz/super/bon/bon/ahoy
```
11

readlink -f ../super/symlink_bon/ahoy

rbs · 2009-06-23 17:46:08 9
Migrate existing Ext3 filesystems to Ext4

Before doing this, back-up all data on any ext3 partitions that are to be converted to ext4. After running previous command you MUST run fsck, is needed to return the filesystem to a consistent state. fsck -pDf /dev/yourpartition Edit /etc/fstab and change the 'type' from ext3 to ext4 for any partitions that are converted to ext4.
This is sample output - yours may be different.
5

tune2fs -O extents,uninit_bg,dir_index /dev/yourpartition

starchox · 2009-06-23 17:42:01 14
‹ First < 482 483 484 485 486 > Last ›

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.

Share Your Commands

Check These Out

Grab a list of MP3s out of Firefox's cache

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the names of those tunes straight out of FF's cache in a nice, easy to read list. What you do with them after that is *ahem* no concern of mine. ;)

See where a shortened url takes you before click

Another way to calculate sum size of all files matching a pattern

Here the pattern is '*.jar', you could pass in any pattern. Another, maybe nicer way to do this is http://www.commandlinefu.com/commands/view/1921/summarise-the-size-of-all-files-matching-a-simple-regex You could replace sed with tr

Configure a serial line device so you can evaluate it with a shell script

I had a hard time in finding the correct settings to get reasonable output from a coin selector which sends its data over a serial line. In the end, minicom came to the rescue and pointed me on the right track. So, if you need to do something similar, these settings may help you. Replace ttyUSB0 with your device file, 9600 with your baud rate, 5 with your read timeout (10ths of a second), and 1 with the minimum numbers of characters you want to read. You can then open the device file like you are used to do, example: $ DATA="`xxd -ps -l 5 \"$DEV\"`"

Execute a command at a given time

This command will create a popup reminder window to assist in remembering tasks http://i.imgur.com/2n7viiA.png is how it looks when created

Set file access control lists

The file myfile is owned by tom and has read and write permissions for tom. Group and other permissions are empty which make myfile readable and writable only by tom. setfacl enables user tom to give read permission to user john only. The command 'ls -l' shows a '+' sign telling us that file access control list has been setup for myfile.

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

check open ports without netstat or lsof

Open Remote Desktop (RDP) from command line and connect local resources

The above command will open a Remote Desktop connection from command line, authenticate using default username and password (great for virtual machines; in the exampe above it's administrator:password), create a shared folder between your machine and the other machine and configure resolution to best fit your desktop (I don't like full screen because it make the desktop panels to disappear). The command will run in the background, and expect to receive parameters. You should enter hostname or IP address as a parameter to the command, and can also override the defaults parameters with your own.

Count the number of pages of all PDFs in current directory and all subdirs, recursively

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)

All commands (14,187) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

All commands (14,187)

sorted by