Commands using cat sorted by votes

Commands using cat (514)

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sendmail via commandline
This is sample output - yours may be different.
-3

cat file.txt | sendmail -F myname -f admin@mysite.com guest@guest.com

kev · 2011-09-18 11:35:35 47
ssh Publickey auf remote Rechner anh?ngen
This is sample output - yours may be different.
-3

cat .ssh/id_rsa.pub | ssh user@server "cat >>.ssh/authorized_keys2"

chrrr · 2011-10-13 09:08:57 4

Displaying wireless signal on screen in realtime.

Values will depend on the driver and the hardware specifics, so you need to refer to your driver documentation for proper interpretation of those values. Show Sample Output

-3

watch -n 1 cat /proc/net/wireless

cantormath · 2012-06-07 10:38:21 4

Replace spaces with newlines

This command is useful for separating a text file where all the words are in one line. Any group of spaces will be replaced with a single newline. Instead of one long line of tokens. You'll have a long list of tokens. One token per line.
This is sample output - yours may be different.
-4

cat file.txt|perl -ne '$_=~s/\s+/\n/g; print $_;'

foodie · 2009-02-06 08:47:18 15

full cpu info (linux)

how to get full cpu info of your (linux) box Show Sample Output

-4

cat /proc/cpuinfo

stinger · 2009-02-17 14:50:29 8

Find out your Debian version

Easy way to find out what Debian version your machine is running Show Sample Output
This is sample output - yours may be different.
```
5.0.2
```
-4

cat /etc/debian_version

caiosba · 2009-08-05 14:47:05 5
Merge - Concate MP3 files

cat - concatenate MP3 files and save it... Show Sample Output
This is sample output - yours may be different.
```
file3.mp3
```
-4

# cat file1.mp3 file2.mp3 > file3.mp3

svnlabs · 2010-01-17 13:18:34 5
Combining text files into one file

the last person who posted used the most roundabout way to concatinate files, there's a reason there's a "conCATinate" command... Using this method, you also get to choose the order of the files, below another person just did *.txt > combined.txt which is fine but the order depends on the implementation of "cat" which is probably alphabetical order of filenames. Show Sample Output
This is sample output - yours may be different.
```
$cat stdHeader tableOfContents introduction body conclusion worksCited index  > researchPaper
$pwd; ls;
/home/ginoman/researchPapers/sample/
body                conclusion                index
introduction        researchPaper             stdHeader
tableOfContents     worksCited
$
```
-4

cat file1 ... fileN > combinedFile;

GinoMan2440 · 2010-04-17 01:00:04 4
Blue Matrix

Matrix Screen HPUX
This is sample output - yours may be different.
-4

while :; do integer i=0; COL=$((RANDOM%$(tput cols))); ROW=$((RANDOM%$(tput cols))); while (( i <= COL)) do tput cup $i $ROW; echo "\033[1;34m" $(cat /dev/urandom | head -1 | cut -c1-1) 2>/dev/null; i=$(expr $i + 1); done done

mfrancime · 2010-05-28 11:17:43 3
kill all running instances of wine and programs runned by it (exe)

This command kills all wine instances and each EXE application working on a PC. Here is command info: 1) ps ax > processes = save process list to file named "processes" (we save it because we don't wont egrep to be found in the future) 2) cat processes | egrep "*.exe |*exe]" = shows the file "processes" and after greps for each *.exe and *exe] in it 3) | awk '{ print $1 }' > pstokill = saves processes PID's to file "pstokill" using awk filter 4) kill $(cat pstokill) = kills each PID in file pstokill, which is shown by cat program 5) rm processes && rm pstokill = removes temporary files Show Sample Output
This is sample output - yours may be different.
```
(silence if ok; kill usage if there are no EXE/wine programs running)
```
-4

ps ax > processes && cat processes | egrep "*.exe |*exe]" | awk '{ print $1 }' > pstokill && kill $(cat pstokill) && rm processes && rm pstokill

sxiii · 2011-02-26 16:13:58 6
Counting the source code's line numbers C/C++ Java

Count your source and header file's line numbers For example for java change the command like this find . -name '*.java' -exec cat {} \;|wc -l Show Sample Output
This is sample output - yours may be different.
```
855476
```
-4

find /usr/include/ -name '*.[c|h]pp' -o -name '*.[ch]' -exec cat {} \;|wc -l

kerim · 2011-12-01 19:58:52 7
Cat files in a directory; for loop command

no need for a for loop when cat takes multiple arguments
This is sample output - yours may be different.
-4

cat *

bahamas10 · 2011-12-08 05:32:14 3
copy public key

for passwordless login
This is sample output - yours may be different.
-4

cat .ssh/id_rsa.pub | ssh user@server 'cat >> ~/.ssh/authorized_keys2'

er0k · 2012-07-12 15:42:10 97
Check if *hardware* is 32bit or 64bit

CPU flags: rm --> 16-bit processor (real mode) tm --> 32-bit processor (? mode) lm --> 64-bit processor (long mode)
This is sample output - yours may be different.
-4

if [[ lm = $(cat /proc/cpuinfo | grep " lm ") ]] ; then echo "64 bits" ; else echo "32 bits" ; fi

agd · 2013-02-11 22:40:46 4
Hex Dump
This is sample output - yours may be different.
-4

cat /dev/ttyS2 | hexdump -C

techie · 2013-05-07 14:54:37 11
Truncate logs in unix

This find files of name like *.log and truncates them.
This is sample output - yours may be different.
-5

logs=$(find . -name *.log);for log in $logs; do cat /dev/null > $log;done

unixmonkey2006 · 2009-03-04 10:05:48 13
netstat -p recoded (totaly useless..)

Ok so it's rellay useless line and I sorry for that, furthermore that's nothing optimized at all... At the beginning I didn't managed by using netstat -p to print out which process was handling that open port 4444, I realize at the end I was not root and security restrictions applied ;p It's nevertheless a (good ?) way to see how ps(tree) works, as it acts exactly the same way by reading in /proc So for a specific port, this line returns the calling command line of every thread that handle the associated socket
This is sample output - yours may be different.
-5

p=$(netstat -nate 2>/dev/null | awk '/LISTEN/ {gsub (/.*:/, "", $4); if ($4 == "4444") {print $8}}'); for i in $(ls /proc/|grep "^[1-9]"); do [[ $(ls -l /proc/$i/fd/|grep socket|sed -e 's|.*\[$.*$\]|\1|'|grep $p) ]] && cat /proc/$i/cmdline && echo; done

j0rn · 2009-04-30 12:39:48 639

Passwords from 9/11 tragedy pager intercepts (Yeah! Plain text! From wikileaks.net)

http://www.reddit.com/r/reddit.com/comments/a7xpt/conspiracy_theories_commence_wikileaks_to_release/ Show Sample Output

-5

while true; do wget -r -l1 --no-clobber -A.txt http://911.wikileaks.org/files/index.html; done; cat *.txt | grep pass

Cowboy · 2009-11-26 23:38:44 3

a find and replace within text-based files, for batch text replacement, not using perl
This is sample output - yours may be different.
-5

for file in `find . -iname "FILENAME"`; do cat $file | sed "s/SEARCH_STRING/REPLACE_STRING/" > $file.tmp; mv $file.tmp $file; done

unixmonkey6754 · 2010-02-24 13:46:29 3
Get non-printable keycode to bind keys in applications

In exemple, screen can bind keys to switch between windows. I like to use Ctrl + Arrow to move left or right window. So I bind like this in .screenrc : bindkey ^[OD prev # Ctl-left, prev window bindkey ^[OC next # Ctl-right, next window Show Sample Output
This is sample output - yours may be different.
```
$ cat > /dev/null
(press some non-printable keys, here Ctrl + Left Arrow)
^[OD
```
-5

cat > /dev/null

GouNiNi · 2010-10-08 14:35:25 3
ROT13 using the tr command

Will rot 13 whatever parameter follows 'rot13', whether it is a string or a file. Additionally, it will rot 5 each digit in a number
This is sample output - yours may be different.
-5

function rot13 { if [ -r $1 ]; then cat $1 | tr '[N-ZA-Mn-za-m5-90-4]' '[A-Za-z0-9]'; else echo $* | tr '[N-ZA-Mn-za-m5-90-4]' '[A-Za-z0-9]'; fi }

twjolson · 2011-03-18 09:59:41 4
replace text in all files in folder, into subfolder

if you want to replace "foo" with "bar" in all files in a folder, and put the resulting files into a new subfolder
This is sample output - yours may be different.
-5

mkdir replaced;for i in *; do cat "$i"| sed 's/foo/bar/' > "replaced/$i"; done

rubo77 · 2011-08-30 08:28:26 5
Remove lines ending or trailing at least one slash (/)
This is sample output - yours may be different.
-5

cat file.txt | grep -v /$ > newfile.txt

bugmenot · 2012-10-31 01:55:07 5
Remove the first character of each line in a file

http://www.ivorde.ro/How_to_remove_first_last_character_from_a_string_using_SED-75.html
This is sample output - yours may be different.
-5

cat files |sed 's/.$.*$/\1/'

bugmenot · 2012-12-06 22:59:16 4
Find out which version of linux you are running
This is sample output - yours may be different.
-6

cat /etc/*issue

lv4tech · 2009-05-07 20:53:03 10
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To create files with specific permission:

Setting global redirection of STDERR to STDOUT in a script

You have a script where =ALL= STDERR should be redirected to STDIN and you don't want to add "2>&1" at the end of each command... E.G.: $ ls -al /foo/bar 2>&1 Than just add this piece of code at the beginning of your script! I hope this can help someone. :)

list files recursively by size

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Find usb device in realtime

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

Currency Conversion

This works in Mac OS X (10.6.2) (natively comes with curl) usage: currency_convert $1(amount) $2(from_denomination) $3(to_denomination)

show current directory

Opens a file or URL in the user's preferred application.

Restart X11 with HUP signal

Rapidly invoke an editor to write a long, complex, or tricky command

Get the Nth argument of the last command (handling spaces correctly)

Bash's history expansion character, "!", has many features, including "!:" for choosing a specific argument (or range of arguments) from the history. The gist is any number after !: is the number of the argument you want, with !:1 being the first argument and !:0 being the command. See the sample output for a few examples. For full details search for "^HISTORY EXPANSION" in the bash(1) man page. Note that this version improves on the previous function in that it handles arguments that include whitespace correctly.

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Commands using cat (514)

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