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add random color and external ip address to prompt (PS1)

this adds a random color to your prompt and the external ip. useful if you are using multiple mashines with the same hostname. Show Sample Output
This is sample output - yours may be different.
```
user@host^192.168.0.1:~$ 
```
0

IP=$(nslookup `hostname` | grep -i address | awk -F" " '{print $2}' | awk -F# '{print $1}' | tail -n 1 ); R=3$((RANDOM%6 + 1)); PS1="\n\[\033[1;37m\]\u@\[\033[1;$R""m\]\h^$IP:\[\033[1;37m\]\w\$\[\033[0m\] "

rubo77 · 2010-10-20 07:29:14 7
Reorder file with max 100 file per folder

Smaller Code Better Runtime
This is sample output - yours may be different.
0

find files/ -type f | while read line; do if [ $((i++%100)) -eq 0 ]; then mkdir $((++folder)); fi; cp $line $folder/; done

sraeder · 2011-02-13 00:25:48 3
xpath function

This function uses xmllint to evaluate xpaths. Usage: xpath /some/xpath XMLfile Show Sample Output
This is sample output - yours may be different.
```
$ xpath "//head/title" index.html
<title>All commands | commandlinefu.com</title>
```
0

xpath () { xmllint --format --shell "$2" <<< "cat $1" | sed '/^\/ >/d' }

sharfah · 2011-10-05 07:45:16 14
save login cookie
This is sample output - yours may be different.
0

curl -c cookie.txt -d username=hello -d password=w0r1d http://www.site.com/login

kev · 2011-11-09 02:57:39 3
Get tagged flashcards from Anki databases

Produces a CSV file containing fronts/backs of cards with specified tag ("mytag" above). This command pulls these cards from different card databases, and allows them to be merged into one (by importing the resulting CSV file). The CSV file is not directly produced; instead of commas, "||" are inserted. In your editor of choice, modify the resulting file to put quotes around the text before || and after ||, then change || to a comma (for every line).
This is sample output - yours may be different.
0

for i in `ls *.anki`; do sqlite3 $i "select (cards.question || '||' || cards.answer) from cards, facts where cards.factid=facts.id and facts.tags like '%mytag%';" >> mytag.csv; done

joshuaeckroth · 2012-03-13 19:03:20 3
don't have video stop at EOF while it is downloading

It will just start playing and will not stop at the point that it has downloaded up to when the video starts
This is sample output - yours may be different.
0

mplayer <(tail -fc +0 <filename>)

gtmanfred · 2012-04-30 07:28:42 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
List MP3 albums (e.g. on iPod etc.)
This is sample output - yours may be different.
0

MP3TAG_DECODE_UTF8=0 mp3info2 -p "%a - %l\n" -R . | sort | uniq

infojunkie · 2012-10-31 01:08:09 4
Show reason of revocation for 0xDEADBEEF with gpg.

Shows a sigclass 0x20 (Key revocation) signature packet on a key, including all subpackets. Subpacket 2 is the date of revocation, subpacket 26 the relevant policy, subpacket 29 the reason of revocation (cf. http://rfc.askapache.com/rfc4880/rfc4880.html#section-5.2.3.23 ) and subpacket 16 the issuer of the revocation certificate (usually should be the same as the revoked key). Show Sample Output
This is sample output - yours may be different.
```
:signature packet: algo 1, keyid DEADBEEFDEADBEEF
	version 4, created 1361391004, md5len 0, sigclass 0x20
	digest algo 8, begin of digest ef ce
	hashed subpkt 2 len 4 (sig created 2013-02-20)
	hashed subpkt 26 len 21 (policy: http://example.net/policy)
	hashed subpkt 29 len 23 (revocation reason 0x01 (I felt funny and wanted to revoke this key))
	subpkt 16 len 8 (issuer key ID DEADBEEFDEADBEEF)
	data: [4093 bits]
```
0

gpg --export 0xDEADBEEF | gpg --list-packets | grep -Pzao ':signature packet:.*\n\t.*sigclass 0x20(\n\t.*)*'

claudius · 2013-03-05 14:11:11 5
Encrypt/decrypt a string from the command line

Need to encrypt something from the command line? I've used this before to encrypt passwords with a master password that was shared amongst a team. To decrypt: ~$ echo -n 'jA0EAwMCPdknsznAww5gySL1/quqhXg6QgQkIz5abzGP5EZgTbXCFU+y6dP8ySWovytc' | base64 --decode | gpg --decrypt gpg: CAST5 encrypted data Enter passphrase: secret gpg: encrypted with 1 passphrase HelloWorld! Show Sample Output
This is sample output - yours may be different.
```
Enter passphrase: secret
Repeat passphrase: secret
jA0EAwMCPdknsznAww5gySL1/quqhXg6QgQkIz5abzGP5EZgTbXCFU+y6dP8ySWovytc
```
0

echo 'HelloWorld!' | gpg --symmetric | base64

ryanchapman · 2013-07-06 08:30:35 46
IBM AIX: Calculate the SHA256 hashes of a directory without sha256sum

This command is for producing GNU sha256sum-compatible hashes on UNIX systems that don't have sha256sum but do have OpenSSL, such as stock IBM AIX. 1.- Saves a wrapper script for UNIX find that does the following: A.- Feeds a file to openssl on SHA256 hash calculation mode B.- Echoes the output followed by the filename 2.- Makes the file executable 3.- Runs find on a directory, only processing files, and running on each one the wrapper script that calculates SHA256 hashes Pending is figuring out how to verify a sha256sum file on a similar environment. Show Sample Output
This is sample output - yours may be different.
```
6e94b0b7fc2805ad558f8039ed038a6272f61846eaa5f4931abd826193c78b83 cognos-installers/TM1-952-AIX/952_FP2_aix.tar.gz
c9d0f04ad6f86482bf4c41ba7a303e0d8a0e8c96c9c9492bc518d2a2bc0166c7 cognos-installers/TM1-952-AIX/952_FP2_HF6_aix.tar.gz
46ede3255abff4e356b002a9cd12df259275a15910768997bfbbae3c637b7f32 cognos-installers/TM1-952-windows/TM1_9.5.2_Windows_x64.7z
92faf20dd3ff25d2c8d94308f03fd8477d0980d6b740baa96a8e79b30b49456f cognos-installers/TM1-952-windows/TM1_Workflow_9.5.2_Windows_x64.7z
630a66a1f7cc3044f370cec730820d73d66cb284a2a09e197c00f82d6900d932 cognos-installers/cognos-BI-102/cognos-FM/fm_10.2_win_ml.tar.xz
```
0

echo '#! /usr/bin/ksh\necho `cat $1 | openssl dgst -sha256` $1' > sslsha256; chmod +x sslsha256; find directory -type f -exec ./sslsha256 \{\} \;

RAKK · 2013-09-18 17:37:50 8
postgresql : drop all sequences from the public schema

This command drops all the sequences of the 'public' schema from the database. First, it constructs a 'drop sequence' instruction for each table found in the schema, then it pipes the result to the psql interactive command. See it scripted here : https://gist.github.com/cuberri/6868774#file-postgresql-drop-create-sh
This is sample output - yours may be different.
0

psql -h <ph_host> -p <pg_port> -U <pg_user> <pg_db> -t -c "select 'drop sequence \"' || relname || '\" cascade;' from pg_class where relkind='S'" | psql -h <ph_host> -p <pg_port> -U <pg_user> <pg_db>

cuberri · 2013-12-11 15:42:34 6

xcowsay "$(cowsay smile)"

brownman · 2014-06-24 05:17:04 7

Set APM_level for HDD to prevent frequent parking
This is sample output - yours may be different.
0

sudo hdparm -B 200 /dev/sda

13_rom · 2014-10-16 13:01:13 8
Find which fibre HBA a disk is connected to

Useful for big systems with lots of cards. (Update: does not work with USB disks)
This is sample output - yours may be different.
0

udevadm info -q all -n /dev/sdc | grep ID_PATH | cut -d'-' -f 2 | xargs -n 1 lspci -s

mhs · 2015-01-27 15:34:02 9
get a random regex match from a file

seed the random number generator, find all matches in a file put all matches from the capture group into an array return a random element from the array Show Sample Output
This is sample output - yours may be different.
```
25
```
0

awk 'BEGIN{srand()} match($0, /DELTA=([0-9]+);/, a) {w[i++]=a[1]} END {print w[int(rand()*i)]}' file.name

jkirchartz · 2015-11-13 17:56:34 11
Convert audio to video [m4a 2 mp4]

http://www.labnol.org/internet/useful-ffmpeg-commands/28490/
This is sample output - yours may be different.
0

ffmpeg -loop 1 -i image.jpg -i audio.m4a -c:v libx264 -c:a aac -strict experimental -b:a 192k -vf scale=720:-1 -shortest video-output.mp4

andresaquino · 2016-01-02 18:01:17 11
Amount of physical memory in HP-UX
This is sample output - yours may be different.
0

/opt/ignite/bin/print_manifest

mezgani · 2017-07-05 06:32:32 20
Create a role on the Chef server with a description
This is sample output - yours may be different.
0

knife role create role-name --description "this is a role that does cool stuff"

niko47 · 2018-10-05 16:00:41 408
Clear Cached Memory on Ubuntu

Clear Cached Memory on Ubuntu based distributions, and also display memory status. Please do not use this on a production machine unless you really really know what you are doing. Echo 3 is a kinder way of purging the memory, you can also use 'echo 2' or 'echo 1' if #1 You know what you are doing, and #2 refer to number 1 :-)
This is sample output - yours may be different.
0

sudo free && sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

tg0000 · 2021-09-13 16:45:20 584
Install a library to a remote repository
This is sample output - yours may be different.
0

mvn deploy:deploy-file -DgroupId=groupId -DartifactId=artifactId -Dversion=1.0 -Dpackaging=jar -Dfile=pathtolib -DrepositoryId=repository -Durl=url

agasea · 2009-04-23 18:13:08 4
get the list of temps for your hard-drives

get a list of temps of your hard-drives. Show Sample Output
This is sample output - yours may be different.
```
31 31 31 29
```
0

hddtemp /dev/sda /dev/sdb /dev/hda /dev/hdb | gawk '{print $NF}' | perl -n -e '$_ =~ s/(\d+)/print "$1 "/eg }{ print "\n"'

microft · 2009-05-20 16:01:58 4
Get your public ip using dyndns
This is sample output - yours may be different.
0

curl -s 'http://www.loopware.com/ip.php'

incognitus · 2009-12-09 11:27:48 3
Ramp the system volume up 5%

Or, aumix -v -5 Map these to key combinations in your window manager and who needs special buttons?
This is sample output - yours may be different.
0

aumix -v +5

h3xx · 2011-07-24 07:41:40 3
send cookie
This is sample output - yours may be different.
0

curl -b cookie.txt http://www.site.com/download/file.txt

kev · 2011-11-09 03:00:49 4
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Chrome sucks

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Produce a pseudo random password with given length in base 64

Of course you will have to install Digest::SHA and perl before this will work :) Maximum length is 43 for SHA256. If you need more, use SHA512 or the hexadecimal form: sha256_hex()

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Print lines in a text file with numbers in first column higher or equal than a value

A text file contains thousands of numbers. This command prints lines were the number is greater or equal than a specified value (134000000).

Make a playlistfile for mpg321 or other CLI player

A short variant if you have only one directory whit only audio files in it.

Find all plain text files that do not contain STRING

shortcut to scp a file to the same location on a remote machine

This will copy a file from your current directory to the same location on another machine. Handy for configuring ha, copying your resolv.conf, .bashrc, anything in /usr/local, etc.

Recover deleted Binary files

The above command assumes the lost data is on /dev/sda and you previously issued the following command to mount _another_ disk or partition (/dev/sdb1) on /recovery $sudo mount /dev/sdb1 /recovery If you don't do this, the data could be overwrited! foremost is a very powerful carving tool. By default foremost recovers all known file types. If you want to reduce the amount of files that are recovered you can specify the file type you are looking for. Read the man page to know the available file types. i.e to recover JPEG pictures append to foremost the switch -tjpg

Generate an XKCD #936 style 4 word password

4 random words are better than one obfuscated word http://xkcd.com/936/

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

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