All commands sorted by votes

All commands (14,187)

sorted by

Dump
This is sample output - yours may be different.
-1

jmap -dump:live,format=b,file=o.hprof pid ; jstack -l pid > /oracle/ora_app1/p.tdump

Plancton · 2015-12-15 12:34:09 13

Change default terminal emulator

Show Sample Output

-1

update-alternatives --config x-terminal-emulator

l1feh4ck3r · 2009-02-13 13:45:43 8

Show Network IP and Subnet

same thing as the other
This is sample output - yours may be different.
-1

ipcalc $(ifconfig eth0 | grep "inet addr:" | cut -d':' -f2,4 | sed 's/.+Bcast:/\//g') | awk '/Network/ { print $2 } '

solarislackware · 2009-12-05 15:00:32 3
print shared library dependencies
This is sample output - yours may be different.
-1

ldd path_to_executable

yababay · 2010-09-06 17:07:39 3
Lookaround in grep

tutorial @ http://www.regular-expressions.info/lookaround.html also see @ http://stackoverflow.com/questions/5080988/how-to-extract-string-following-a-pattern-with-grep-regex-or-perl for tip: `grep -Po 'name="\K.*?(?=")' file.txt` Show Sample Output
This is sample output - yours may be different.
```
$ John
```
-1

echo "John's" | grep -Po '\b\w+(?<!s)\b'

evandrix · 2011-07-15 12:08:18 6
print shared library dependencies

use this to avoid executing the target app
This is sample output - yours may be different.
-1

function ldd(){ objdump -p $1 | grep -i need; }

jyf · 2010-09-07 02:44:59 3
Print the local ip on a wireless connection

On wired connections set 'eth0' instead of 'wlan0'
This is sample output - yours may be different.
-1

sudo ifconfig wlan0 | grep inet | awk 'NR==1 {print $2}' | cut -c 6-

mouths · 2013-02-18 14:10:07 8
Save the network interface info into a text file, so that you can re-apply it later

On Windows 2000 or newer, you can use the command line to save the current network interface info. You can then edit the text file and re-apply it using the netsh -f command (or netsh exec). Keep a bunch of text files around to quickly switch connection info without using extra software. http://en.wikipedia.org/wiki/Netsh http://support.microsoft.com/kb/242468 http://thelazyadmin.com/blogs/thelazyadmin/archive/2005/04/04/Using-Netsh-to-Manage-Network-Interfaces-Part-2.aspx Show Sample Output
This is sample output - yours may be different.
```
# ----------------------------------
# Interface IP Configuration
# ----------------------------------
pushd interface ip
# Interface IP Configuration for "builtin"
set address name="builtin" source=dhcp
set dns name="builtin" source=static addr=192.168.0.12 register=PRIMARY
add dns name="builtin" addr=192.168.0.1 index=2
set wins name="builtin" source=dhcp
popd
# End of interface IP configuration
```
-1

netsh interface ip dump > current-interfaces.txt

piyo · 2009-02-13 15:13:05 8
Return Dropbox folder location.

Newer versions of Dropbox let you choose the location for your Dropbox folder. If you use script to put things into your Dropbox folder (todo list, screenshots, torrents etc.) but have the Dropbox folder in different locations on your other computers this lets you use the same script on all systems without having to tell it where the Dropbox folder is. Show Sample Output
This is sample output - yours may be different.
```
/home/user/Dropbox
/media/backup/Dropbox
/really/deep/level/subdirectory/for/some/reason/Dropbox
```
-1

sqlite3 $HOME/.dropbox/config.db "select value from config where key like '%dropbox_path%'"

mobilediesel · 2011-06-05 08:26:02 13
Broadcast your shell thru ports 5000, 5001, 5002 ...

solution that works for me
This is sample output - yours may be different.
-1

script -qf | tee >(nc -l -p 5000)

nesses · 2013-04-13 00:22:02 5
Clearcase find branch
This is sample output - yours may be different.
-1

ct find -avobs -nxname -element 'brtype(branch_name)' -print 2>/dev/null

naseer · 2009-02-05 17:02:29 23
batch convert OGG to WAV
This is sample output - yours may be different.
-1

for f in *.ogg ; do mplayer -quiet -vo null -vc dummy -ao pcm:waveheader:file="$f.wav" "$f" ; done

ideasman42 · 2009-02-23 10:09:10 8
one line command to recursively add all jar files in current folder to java class path

a pretty simple script when running java programs from command line Show Sample Output
This is sample output - yours may be different.
```
.:/home/hyhu/Ubuntu One/javalibs/a.jar:/home/hyhu/Ubuntu One/javalibs/b.jar:/home/hyhu/Ubuntu One/javalibs/c.jar:/home/hyhu/Ubuntu 
```
-1

CLASSPATH=.; export CLASSPATH=$CLASSPATH$(find "$PWD" -name '*.jar' -type f -printf ':%p\n' | sort -u | tr -d '\n'); echo $CLASSPATH

dexterhu · 2011-03-11 19:21:15 3
Create web site ssl certificates
This is sample output - yours may be different.
-1

openssl req -new -x509 -extensions v3_ca -days 1100 -subj "/C=CA/ST=CA/L=SomeCity/O=EXAMPLE Inc./OU=Web Services/CN=example.com/emailAddress=postmaster@example.com" -nodes -keyout web.key -out web.crt

plasticdoc · 2011-06-05 08:57:21 3
Countdown Clock

I find the other timers are inaccurate. It takes some microseconds to perform the date function. Therefore, using date/time math to calculate the time for us results in millisecond accuracy. This is tailored to the BusyBox date function. May need to change things around for GNU date function. Show Sample Output
This is sample output - yours may be different.
```
00:03:00
```
-1

let T=$(date +%s)+3*60;while [ $(date +%s) -le $T ]; do let i=$T-$(date +%s); echo -ne "\r$(date -d"0:0:$i" +%H:%M:%S)"; sleep 0.3; done

davidk · 2019-10-22 15:04:21 141
Copy files from one dir to another using tar.

Add z to the flags to enable compression.
This is sample output - yours may be different.
-1

tar cf - . | (cd /new/dir; tar xvf -)

jauderho · 2009-03-09 20:30:34 12
Print just line 4 from a textfile

using tail first won't do it because tail counts from the bottom of the file. You could do it this way but I don't suggest it
This is sample output - yours may be different.
-1

head -n X | tail -n 1

infinull · 2010-07-08 22:06:39 4
recursively add all sub folders with executable file of current folder to PATH environment variable

(1) don't run twice, or the same folder will occur in $PATH. (2) otherwise you need to start a new terminal Show Sample Output
This is sample output - yours may be different.
```
blah blah blah ..... (too long)
```
-1

export PATH=$PATH$(find "$PWD" -name '.*' -prune -o -type f -a -perm /u+x -printf ':%h\n' | sort -u | tr -d '\n'); echo $PATH

dexterhu · 2011-03-11 19:31:17 7
Purge application's residual config & orphans
This is sample output - yours may be different.
-1

dpkg -l | sed '/^rc/!d;s/^[^ ]* [^ ]* $[^ ]*$.*/\1/' | xargs -r sudo apt-get -y purge

plasticdoc · 2011-06-05 09:19:27 3
Prints line numbers

Works in RHEL5 and derivatives.
This is sample output - yours may be different.
-1

nl <filename>

SuperFly · 2010-01-06 16:14:43 3
Find default gateway
This is sample output - yours may be different.
-1

route -n | grep "^0\." | awk '{print "Gateway to the World: "$2", via "$NF""}'

bandie91 · 2010-08-09 11:55:37 26
SSH with sql like commad

I will ssh to ip address 192.168.2.1 with user name user. "connect user 192.168.1.1" is same as "ssh user@192.168.1.1"
This is sample output - yours may be different.
-1

add "ssh $1@$2" in /usr/sbin/connect with executable permission, now use commad "connect user 192.168.1.1"

sandeepvreddy · 2012-01-27 12:50:20 3
Realtime lines per second in a log file

logtop show number of lines per second, also classify them so you can show a "top" of every aspect of your logfile : tail -f access.log | awk '{print $1; fflush();}' | logtop
This is sample output - yours may be different.
-1

tail -f logfile | logtop

Sizeof · 2012-06-24 19:18:30 3
View open file descriptors for a process.
This is sample output - yours may be different.
-1

lsof -p <process_id> | wc -l

virtualshock · 2009-07-20 17:46:54 4
a simple alarm

this command will beep like an alarm for one minute from 18:57. you can change "1857" to your desired time. you should have alsa-oss package installed, and you should also be root or part of "audio" group.
This is sample output - yours may be different.
-1

while true; do while [ `date +%H%M` == "1857" ] ; do sleep 1s; yes | head -n 2000 > /dev/dsp; done; done;

mrwill · 2011-04-23 14:44:26 8
‹ First < 483 484 485 486 487 > 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

a find and replace within text-based files, to locate and rewrite text en mass.

syntax follows regular command line expression. example: let's say you have a directory (with subdirs) that has say 4000 .php files. All of these files were made via script, but uh-oh, there was a typo! if the typo is "let's go jome!" but you meant it to say "let's go home!" find . -name "*.php" | xargs perl -pi -e "s/let\'s\ go\ jome\!/let\'s\ go\ home\!/g" all better :) multiline: find . -name "*.php" | xargs perl -p0777i -e 's/knownline1\nknownline2/replaced/m' indescriminate line replace: find ./ -name '*.php' | xargs perl -pi -e 's/\".*$\"/\new\ line\ content/g'

Gets the english pronunciation of a phrase

Sends a string to google tranlator, which converts it to English speech. It's possible to create a nice script to do the job for us, such as #!/bin'bash curl -A "Mozilla" "http://translate.google.com/translate_tts?tl=en&q=$1" > /tmp/speak.mp3 mplayer /tmp/speak.mp3

cd to (or operate on) a file across parallel directories

This is useful for quickly jumping around branches in a file system, or operating on a parellel file. This is tested in bash. cd to (substitute in PWD, a for b) where PWD is the bash environmental variable for the "working directory"

Edit all files found having a specific string found by grep

The grep switches eliminate the need for awk and sed. Modifying vim with -p will show all files in separate tabs, -o in separate vim windows. Just wish it didn't hose my terminal once I exit vim!!

Test network speed without wasting disk

The above command will send 4GB of data from one host to the next over the network, without consuming any unnecessary disk on either the client nor the host. This is a quick and dirty way to benchmark network speed without wasting any time or disk space. Of course, change the byte size and count as necessary. This command also doesn't rely on any extra 3rd party utilities, as dd, ssh, cat, /dev/zero and /dev/null are installed on all major Unix-like operating systems.

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.

Make shell (script) low priority. Use for non interactive tasks

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"

determine if a shared library is compiled as 32bit or 64bit

Determines the flavor of a shared library by looking at the addresses of its exposed functions and seeing if they are 16 bytes or 8 bytes long. The command is written so the library you are querying is passed to a variable up font -- it would be simple to convert this to a bash function or script using this format.

Application network trace based on application name

This command takes an application name as an argument and then it will listen to the tcp traffic and capture packets matching the process Id of the application. The output shows: local address / local port / Remote Address / Remote port / State / Owning Process ID

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