What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. 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.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.

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:



May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags





Commands by totti from sorted by
Terminal - Commands by totti - 87 results
echo "abcde" | sed 's/./& /g'
NotifyOnBATTERY () { while :; do on_ac_power||notify-send "Running on BATTERY"; sleep 1m; done }
2011-08-26 11:54:16
User: totti
Functions: sleep
Tags: battery notify

Works on Laptops, Desktop having communication b/w UPS & CPU

for i in `seq -w 1 50`; do wget --continue \ http://commandline.org.uk/images/posts/animal/$i.jpg; done
apropos <part_rember> | less
2011-08-19 19:34:57
User: totti
Functions: apropos
Tags: less apropos

Show all commands having the part known by you.


apropos pdf | less
fileName() { echo "$1" | grep -o "[^/]*$"; }
2011-08-19 18:16:22
User: totti
Functions: echo grep
Tags: grep basename
fileName /path/to/file.ext

quivalent to

basename /path/to/file.ext
VBoxManage internalcommands createrawvmdk -filename [path/to/file/name.vmdk] -rawdisk /dev/[block_device]
2011-08-19 14:26:22
User: totti


VBoxManage internalcommands createrawvmdk -filename ~/.VBox_sdc.vmdk -rawdisk /dev/sdc

In order to start virtual box using block devices, ( Or to boot from it) run as ROOT

sudo VirtualBox

Then add & select the vmdk file as a device.

At last Start the virtual box.

- This cmd needs to run once for a device.

- See command 8936 to run with out using ROOT power and easy handling of Virtual m/c

allVideos() { find ./ -type f -print0 | xargs -0 file -iNf - | grep ": video/" | cut -d: -f1; }
2011-08-19 11:58:59
User: totti
Functions: cut file find grep xargs

Videos are found using their MIME type. Thus no need to for an extension for the video file.

This is a efficent version of "jnash" cmd (4086). Thanks for jnash. This cmd will only show video files while his cmd show files having "video" anywhere in path.

manswitch() { man $1 | grep -A5 "^ *\-$2"; }
2011-08-19 08:36:54
User: totti
Functions: grep man
Tags: man grep switch

Find the usage of a switch with out searching through the entire man page.

Usage: manswitch [cmd] [switch]


manswitch grep silent


In simple words

man <cmd> | grep "\-<switch>"


man grep | grep "\-o"

This is not a standard method but works.

ps aux | sort -nk 6
curl -I -H "Accept-Encoding: gzip,deflate" http://example.org
watch -n 2 -d '/sbin/ifconfig eth0'
VBoxBlockBoot() { sudo umount "$2"*; sudo chmod 777 "$2"; VBoxManage storageattach "$1" --medium ~/.rawHD4VB_`basename "$2"`.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm "$1";}
2011-07-29 13:04:19
User: totti
Functions: chmod sudo umount

Usage: VBoxBlockBoot [Virtual_Machine] [Block_device]

Eg: VBoxBlockBoot WinXP /dev/sdc

In another words

vm=usb; usb=sdc;sudo umount /dev/$usb* ; sudo chmod 777 /dev/$usb ; VBoxManage storageattach $vm --medium ~/raw-HD-4-VB/$usb.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm $vm


vm --> Name of the virtual machine to start

usb --> Block device to use. (/dev/sdc)

This can used after setup up a boot loader on to my USB pen drive or HDD (After creating Live USB). Here root privilege is needed but not granted to Virtual Box. Thus we can access all our VM.( If we run VBox as root we can't access our VMs). Root privilege is used to

- Unmount the storage device

- Chmod to full access (777)


1. Device information file (rawvmdk file) created by the following command. Need to run only once. Not bad to run many.

VBoxCreateRawDisk() { VBoxManage internalcommands createrawvmdk -filename ~/.rawHD4VB_`basename "$1"`.vmdk -rawdisk "$1"; }

2. Root privilege to umount & chmod

3. Real storage medium (ie /dev/*) (Non-virtual such as USB HD, pen drive, a partition)

4. A virtual m/c already available (here "usb")

vm=usb; usb=sdc;sudo umount /dev/$usb* ; sudo chmod 777 /dev/$usb ; VBoxManage storageattach $vm --medium ~/raw-HD-4-VB/$usb.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm $vm

VBoxBlockBoot() { sudo umount "$2"*; sudo chmod 777 "$2"; VBoxManage storageattach "$1" --medium ~/.rawHD4VB_`basename "$2"`.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm "$1"; }