Commands using cat sorted by votes

Commands using cat (514)

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Get Total Line Count Of All Files In Subdirectory (Recursive)
This is sample output - yours may be different.
0

find . -type f -name "*.*" -exec cat {} > totalLines 2> /dev/null \; && wc -l totalLines && rm totalLines

philwc · 2012-03-22 13:11:53 3
pdfappend: append multiple pdf files
This is sample output - yours may be different.
0

pdftk 1.pdf 2.pdf cat output 12.pdf

bossNova · 2012-03-28 15:38:34 3
pdftk append with handles
This is sample output - yours may be different.
0

pdftk A=1.pdf B=2.pdf C=3.pdf cat C A output CA.pdf

bossNova · 2012-03-28 15:41:44 22
insert blank lines
This is sample output - yours may be different.
0

sed G input.txt | cat -s

kev · 2012-04-07 02:15:18 5
watch iptables counters

this alternative shows the differences as they occur so that they are made plain Show Sample Output
This is sample output - yours may be different.
```
@@ -28 +28 @@
-  339 27684 zone_lan_forward  all  --  br-lan *       0.0.0.0/0            0.0.0.0/0           
+  340 27768 zone_lan_forward  all  --  br-lan *       0.0.0.0/0            0.0.0.0/0           
```
0

while true; do iptables -nvL > /tmp/now; diff -U0 /tmp/prev /tmp/now > /tmp/diff; clear; cat /tmp/diff; mv /tmp/now /tmp/prev; slee p 1; done

unixmonkey34223 · 2012-04-15 00:02:33 3
Suppress standard output using > /dev/null

This will be very helpful when you are debugging shell scripts, where you don?t want to display the echo statement and interested in only looking at the error messages. Similarly use 2> to supress error messages Show Sample Output
This is sample output - yours may be different.
```
Error messages only
```
0

cat file.txt > /dev/null

ankush108 · 2012-06-26 18:34:12 3
top ten shell command in bash shell
This is sample output - yours may be different.
0

cat ~/.bash_history | perl -lane 'if($F[0] eq "sudo"){$hash{$F[1]}++}else{$hash{$F[0]}++};$all++;END {@top = map {[$_, $hash{$_}]} sort {$hash{$b}<=>$hash{$a}} keys %hash;printf("%10s%10d%10.2f%%\n", $_->[0],$_->[1],$_->[1]/$all*100) for @top[0..9]}'

vinian · 2012-07-02 09:38:06 7
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

chmod authorized_keys so you don't get "Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys"
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh tester@10.2.6.10 "mkdir -p ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys"

unixmonkey37839 · 2012-07-18 04:41:54 12
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

chmod authorized_keys so you don't get "Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys"
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh tester@10.2.6.10 "mkdir -p ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys"

unixmonkey37839 · 2012-07-18 04:41:55 6
Extract URLs from all anchors inside an HTML document with sed and grep

Extract all href links from an HTML document with sed and grep Show Sample Output
This is sample output - yours may be different.
```
#
./index.html
./index2.html
http://www.google.com
./ipl.html
```
0

cat index.html | grep -o '<a .*href=.*>' | sed -e 's/<a /\n<a /g' | sed -e 's/<a .*href=['"'"'"]//' -e 's/["'"'"'].*$//' -e '/^$/ d'

crisboot · 2012-08-06 10:31:38 7
convert unixtime to human-readable

works where perl works, because the awk version is gnu awk only. Show Sample Output
This is sample output - yours may be different.
```
[12-09-19 00:29:33] ...
```
0

cat log | perl -ne 'use POSIX; s/([\d.]+)/strftime "%y-%m-%d %H:%M:%S", localtime $1/e,print if /./'

bs · 2012-09-19 06:38:31 4
find git commits by description

Given a file with the format of 'git log --pretty=short', search in last 100 commits for one with the same description. I used this when after a rebase I had to find out the new commit ids. The second sed replaces all special characters with dots so they don't mess up the grep later on. Show Sample Output
This is sample output - yours may be different.
```
0dd4c64aa728a398d2c579868a3f0191f5d3b4fa write some awesome feature
9a26d4a9a2e37a68dbf21619ef03b58017a42f2f fix a nasty bug
04dcc29359e95e5b944d634cff307605f7c573df write another cool feature
```
0

cat /tmp/commit_list | { while read old_commit ; do msg="`git log --pretty=oneline $old_commit'^'..$old_commit | sed 's/[0-9a-f]* //' | sed 's/[^A-Za-z0-9]/./g'`"; git log --pretty=oneline HEAD@'{100}'..HEAD | grep "$msg" ; done ; }

plexus · 2012-10-11 11:06:40 4
neat diff of remote files owned by root on different systems
This is sample output - yours may be different.
0

diff -u <(ssh -t user@host1 sudo cat /dir1/file1) <(ssh -t user@host2 sudo cat /dir2/file2)

moosaka · 2012-11-09 09:12:56 4
Convert metasploit cachedump files to Hashcat format for cracking
This is sample output - yours may be different.
0

cd ~/.msf4/loot && cat *mscache* | cut -d '"' -f 2,4 | sed s/\"/\:/g | tr -cd '\11\12\40-\176' | grep -v Username | cut -d : -f 1,2 | awk -F':' '{print $2,$1}' | sed 's/ /:/g' > final.dcc.hash

purehate · 2012-11-26 02:10:08 6
Monitor file contents that is being overwritten regularly

Watch file's contents that is getting overwritten Show Sample Output
This is sample output - yours may be different.
```
File contents
Which is beings updated every second
```
0

while sleep 1; do clear; cat /tmp/whatever.cue; done

sergeylukin · 2012-11-26 08:02:03 6
Copy file to multiple destinations
This is sample output - yours may be different.
0

cat myfile | tee dest1 dest2 > /dev/null 2>&1

sergeylukin · 2012-11-28 09:51:25 4
Create a tar archive from a text list without trailing slash in directories
This is sample output - yours may be different.
0

cat list.txt | pax -wd > archive.tar

bugmenot · 2013-01-02 17:53:52 4
Convert metasploit cachedump files to Hashcat format for cracking

Convert Metasploit?s MSCACHE output to Hashcat version (performed in ~/.msf4/loot/):
This is sample output - yours may be different.
0

cat *mscache* | awk -F '"' '{print $4":"$2}'

mubix · 2013-01-06 06:54:57 13
The letter your commands most often start with

Kind of fun if you're that was inclined. I figured most of my commands start with s. sudo, screen, ssh etc. This script tells me what else they start with. Show Sample Output
This is sample output - yours may be different.
```
685 s
255 g
251 c
193 l
130 p
83 n
81 m
70 r
56 d
24 u
23 a
22 t
14 i
14 h
13 f
11 o
7 e
4 w
4 v
4 j
3 k
3 b
1 x
0 z
0 y
0 q
```
0

for i in {a..z}; do echo $(cat ~/.bash_history | grep ^$i.* | wc -l) $i; done | sort -n -r

yaMatt · 2013-01-23 18:59:13 4
Instant threadpool
This is sample output - yours may be different.
0

cat item_list | xargs -n1 -P<n> process_item

sanchan89 · 2013-03-06 20:25:17 31
Verify a file has not been tampered with since dpkg installation

Replace "user/sbin/sshd" with the file you would like to check. If you are doing this due to intrusion, you obviously would want to check size, last modification date and md5 of the md5sum application itself. Also, note that "/var/lib/dpkg/info/*.md5sums" files might have been tampered with themselves. Neither to say, this is a useful command. Show Sample Output
This is sample output - yours may be different.
```
/usr/sbin/sshd: OK
```
0

cat /var/lib/dpkg/info/*.md5sums|grep usr/sbin/sshd|sed 's,usr,/usr,'|md5sum -c

Ztyx · 2013-03-12 11:20:48 7
export key-value pairs list as environment variables

This exports all lines of input file as environment variables, assuming each line is like these: OH=YEAH FU=UUUU
This is sample output - yours may be different.
0

while read line; do export $line; done < <(cat input)

dario · 2013-03-15 08:14:04 10
List LVM Volume Groups as an unprivileged user
This is sample output - yours may be different.
0

cat /sys/block/{*,*/*}/holders/dm*/dm/name | awk -F- '{print $1}' | sort -u

hufman · 2013-04-03 18:00:39 6
Find LVM Volume Group name for a block device
This is sample output - yours may be different.
0

cat /sys/block/md1/holders/dm*/dm/name | awk -F- '{print $1}' | sort -u

hufman · 2013-04-03 18:01:16 5
remove old index.html if you download it again and organiaz the java script tag on the file index.html

remove old index.html if you download it again and organiaz the java script tag on the file index.html
This is sample output - yours may be different.
0

rm index.html | wget www.google.com;cat index.html | sed 's/<script>/\n\n\<script>\n\n/g' | sed 's/<\/script>/>\n\n/g'

lbhack · 2013-04-10 04:05:30 5
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Find out current working directory of a process

This is an alternative to another command using two xargs. If it's a command you know there's only one of, you can just use: $ ls -l /proc/$(pgrep COMMAND)/cwd

Quick HTML image gallery from folder contents

Setting: You have a lot of jpg files in a directory. Maybe your public_html folder which is readable on the net because of Apache's mod_userdir. All those files from the current folder will be dropped into a file called gallery.html as image tags that can be viewed within a web browser locally or or over the Internet. Original: $find . -iname "*.jpg" -exec echo "" >> gallery.html \;

Function to check whether a regular file ends with a newline

tail -c 1 "$1" returns the last byte in the file. Command substitution deletes any trailing newlines, so if the file ended in a newline $(tail -c 1 "$1") is now empty, and the -z test succeeds. However, $a will also be empty for an empty file, so we add -s "$1" to check that the file has a size greater than zero. Finally, -f "$1" checks that the file is a regular file -- not a directory or a socket, etc.

A DESTRUCTIVE command to render a drive unbootable

THIS COMMAND IS DESTRUCTIVE. That said, lets assume you want to render your boot drive unbootable and reboot your machine. Maybe you want it to boot off the network and kickstart from a boot server for a fresh OS install. Replace /dev/fd0 with the device name of your boot drive and this DESTRUCTIVE command will render your drive unbootable. Your BIOS boot priority should be set to boot from HD first, then LAN.

Auto Get Missing Launchpad Keys

You can choose these mirror servers to get gpg keys, if the official one ever goes offline keyserver.ubuntu.com pool.sks-keyservers.net subkeys.pgp.net pgp.mit.edu keys.nayr.net keys.gnupg.net wwwkeys.en.pgp.net #(replace with your country code fr, en, de,etc)

list block devices

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

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"

Remove security limitations from PDF documents using ghostscript (for Windows)

#4345 also works under windows

Get a list of ssh servers on the local subnet

--open -sV is not needed if you are only looking for hosts with 22 open

Show biggest files/directories, biggest first with 'k,m,g' eyecandy

I use this on debian testing, works like the other sorted du variants, but i like small numbers and suffixes :)

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Commands using cat (514)

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