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 66
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 9
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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floating point operations in shell scripts

using bc is for sissies. dc is much better :-D Polish notation will rule the world...

Debug bash shell scripts.

Display commands and their arguments as they are executed. Useful for debugging shell scripts.

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Command to logout all the users in one command

It's only to logout all other user's except "root"

Generate list of words and their frequencies in a text file.

List all information about all files (in current dir)

This is a funny usage of the traditional command ls. It could be basically simplified as: $ ls -a -l Duplicating arguments is permitted: $ ls -a -l -l And this markup could be shortened as: $ ls -al Extra note: To view filesizes like a pro, pray for your God: $ ls -allah

list block devices

Shows all block devices in a tree with descruptions of what they are.

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Copy via tar pipe while preserving file permissions (cp does not!; run this command with root!)

cp options: -p will preserve the file mode, ownership, and timestamps -r will copy files recursively also, if you want to keep symlinks in addition to the above: use the -a/--archive option

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Commands using cat (514)

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