Commands using cat sorted by votes

Commands using cat (514)

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Show line numbers in a text file
This is sample output - yours may be different.
-6

cat x

umahp44 · 2011-09-15 11:53:47 3
show debian version

work on any debian based GNU/Linux distro Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:~$ cat /etc/debian_version 
squeeze/sid
```
-6

cat /etc/debian_version

eastwind · 2011-12-11 11:13:16 185
Get fresh FollowBack list for Twitter

Go to "https://twitter.com/search/realtime?q=%23TeamFollowBack&src=hash" and then copy al the text on the page. If you scroll down the page will be bigger. Then put al the text in a text file called twit.txt If you follow the user there is a high probability the users give you follow back. To follow all the users you can use an iMacros script.
This is sample output - yours may be different.
-6

for a in $(seq 5 8); do cat twit.txt | cut -d " " -f$a | grep "^@" | sort -u; done > followlst.txt

xmuda · 2013-03-29 21:07:09 5
emptying a file

with this command you can empty file Show Sample Output
This is sample output - yours may be different.
```
cat /dev/null >err.log
```
-8

cat /dev/null >filename

vorphalax · 2009-02-13 10:50:41 22
Display which distro is installed

Found in comments section works on most Linux flavors. Show Sample Output
This is sample output - yours may be different.
```
LSB Version:	core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32:desktop-3.1-ia32:desktop-3.1-noarch:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID:	SUSE LINUX
Description:	SUSE Linux Enterprise Server 10 (i586)
Release:	10
Codename:	n/a
```
-8

test `uname` = Linux && lsb_release -a || ( test `uname` = SunOS && cat /etc/release || uname -rms )

virtualshock · 2009-07-07 20:51:30 59
Creating ISO Images from Audio CD

you should umount /dev/cdrom before using this cli
This is sample output - yours may be different.
-8

cat /dev/scd0 > ~/audio_image.iso

eastwind · 2011-09-24 15:29:27 11
Convert JSON to YAML

Valid JSON is a subset of YAML; no transformation is necessary; however, YAML has many syntax features that are not valid JSON, so you can't do the reverse as easily.
This is sample output - yours may be different.
-8

cat data.json >data.yml

Mozai · 2013-04-25 04:09:58 6
Easily find an old command you run

I know how hard it is to find an old command running through all the files because you couldn't remember for your life what it was. Heres the solution!! Grep the history for it. depending on how old the command you can head or tail or if you wanted to search all because you cannot think how long ago it was then miss out the middle part of the command. This is a very easy and effective way to find that command you are looking for.
This is sample output - yours may be different.
-9

cat .bash_history | tail -100 | grep {command}

techie · 2013-04-10 10:40:52 8
Create a iso from the disk.

Generate the iso from the disk, easily. same as "dd if=/dev/cdrom of=~/mydisk.iso"
This is sample output - yours may be different.
-10

cat /dev/cdrom > ~/mydisk.iso

sata · 2009-03-26 05:54:41 29
gunzip all .gz file in current dir

gunzip all .gz file in current dir
This is sample output - yours may be different.
-10

ls | grep .gz >> list.txt && cat list.txt | while read x ; do gunzip -d $x ; done && rm -rf list.txt

maccu · 2010-11-17 11:06:02 14
What is the sound of your memory ?
This is sample output - yours may be different.
-11

sudo cat /dev/mem > /dev/dsp

eastwind · 2009-04-22 07:26:10 4
display a tab separated file as columns
This is sample output - yours may be different.
-11

cat <file>|column -t

bakhru · 2015-05-30 18:56:34 11
List system's users
This is sample output - yours may be different.
-12

teste.txt < cut -d : -f 1,5 /etc/passwd | tr : \\t | tr a-z A-Z | cat teste.txt

osvaldofilho · 2009-10-20 14:53:38 8
Combining text files into one file
This is sample output - yours may be different.
-16

ls | grep *.txt | while read file; do cat $file >> ./output.txt; done;

octopus · 2010-04-16 13:19:38 6
‹ First < 19 20 21

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Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Clone IDE Hard Disk

This command clone the first partition of the primary master IDE drive to the second partition of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)

open a screenshot of a remote desktop via ssh

standard image viewers do not seem to be able to open a FIFO file. xloadimage was the first one i've stumbled upon that can handle this.

Get the current gold price

Returns the current price of a troy ounce of gold, in USD. Requires the "jq" JSON parser.

use wget to check if a remote file exists

send a circular

Wait the end of prog1 and launch prog2

Duplicate several drives concurrently

If you have some drive imaging to do, you can boot into any liveCD and use a commodity machine. The drives will be written in parallel. To improve efficiency, specify a larger block size in dd: $dd if=/dev/sda bs=64k | tee >(dd of=/dev/sdb bs=64k) | dd of=/dev/sdc bs=64k To image more drives , insert them as additional arguments to tee: $dd if=/dev/sda | tee >(dd of=/dev/sdb) >(dd of=/dev/sdc) >(dd of=/dev/sdd) | dd of=/dev/sde

resume other user's screen session via su, without pty error

Normally, if you su to another user from root and try to resume that other user's screen session, you will get an error like "Cannot open your terminal '/dev/pts/0' - please check." This is because the other user doesn't have permission for root's pty. You can get around this by running a "script" session as the new user, before trying to resume the screen session. Note you will have to execute each of the three commands separately, not all on the same line as shown here. Credit: I found this at http://www.hjackson.org/blog/archives/2008/11/29/cannot-open-your-terminal-dev-pts-please-check.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

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Commands using cat (514)

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