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Display / view the contents of the manifest within a Java jar file

Displays the manifest within a jar file. Can use it to confirm version number, etc.
This is sample output - yours may be different.
1

$ unzip -p some-jar-file.jar META-INF/MANIFEST.MF

unixmonkey7399 · 2009-12-10 05:54:16 5
Optimal way of deleting huge numbers of files
This is sample output - yours may be different.
3

find /path/to/dir/ -type f -exec rm {} +

cfajohnson · 2009-12-10 04:44:44 22
Get your public ip
This is sample output - yours may be different.
-3

wget -qO - http://cfaj.freeshell.org/ipaddr.cgi

cfajohnson · 2009-12-10 04:34:57 3
Extract all urls from the last firefox sessionstore.js file used.
This is sample output - yours may be different.
-1

sed -e 's/{"url":/\n&/g' ~/.mozilla/firefox/*/sessionstore.js | cut -d\" -f4

cfajohnson · 2009-12-10 04:31:31 4
Extract all urls from the last firefox sessionstore.js file used.

Require "grep -P" ( pcre ). If you don't have grep -P, use that : grep -Eo '"url":"[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q) | cut -d'"' -f4
This is sample output - yours may be different.
0

grep -oP '"url":"\K[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q)

sputnick · 2009-12-09 20:34:32 4
Collect a lot of icons from /usr/share/icons (may overwrite some, and complain a bit)

In other way of xargs, only with find -exec
This is sample output - yours may be different.
2

mkdir myicons; find /usr/share/icons/ -type f -exec cp {} ./myicons/ \;

glaudiston · 2009-12-09 17:52:23 4

Collect a lot of icons from /usr/share/icons (may overwrite some, and complain a bit)

Today I needed to choose an icon for an app. My simpler way: put all of /usr/share/icons in myicons folder and brows'em with nautilus. Then rm -r 'ed the entire dir. Show Sample Output

mkdir myicons && find /usr/share/icons/ -type f | xargs cp -t myicons

rodolfoap · 2009-12-09 17:43:28 7

list all opened ports on host

in loop, until the last port (65535), list all opened ports on host. in the sample I used localhost, but you can replace with any host to test. Show Sample Output
This is sample output - yours may be different.
```
port 22 opened
port 80 opened
port 631 opened
port 3306 opened
port 3690 opened
port 6665 opened
port 6666 opened
port 6667 opened
port 6668 opened
port 6669 opened
port 7048 opened
port 8079 opened
port 8280 opened
port 8885 opened
port 8888 opened
port 9127 opened
port 23791 opened
port 23943 opened
port 33556 opened
port 34482 opened
port 39447 opened
port 48030 opened
port 51687 opened

real    4m33.201s
user    1m16.657s
sys     2m42.194s
```
1

time { i=0; while [ $(( i < 65535 )) -eq 1 ] ; do nc -zw2 localhost $((++i)) && echo port $i opened ; done; }

glaudiston · 2009-12-09 17:33:47 7
Get your public ip
This is sample output - yours may be different.
1

curl -s http://sputnick-area.net/ip

sputnick · 2009-12-09 16:10:54 3
Joke : prints line numbers in a longest way

This is a joke for @putnamhill and @glaudiston I'm pretty sure we can write longer if we want ;)
This is sample output - yours may be different.
0

perl -e 'use strict; use warnings; my $c; my $file = $ARGV[0]; open my $handle, "<", $file or die "$0: $file: $!\n"; while (<$handle>) { print $c++, " " x 5, $_; } close($handle);' <FILE>

sputnick · 2009-12-09 16:07:14 7
prints line numbers

Hi glaudiston, you can save a few chars by leaving out cat and pipe and still enjoy the added flexibility.
This is sample output - yours may be different.
-1

while read str; do echo "$((++i)) - $str"; done < infile

putnamhill · 2009-12-09 15:11:25 3
random xkcd comic as xml
This is sample output - yours may be different.
1

curl -sL 'dynamic.xkcd.com/comic/random/' | awk -F\" '/^<img/{printf("<?xml version=\"1.0\"?>\n<xkcd>\n<item>\n <title>%s</title>\n <comment>%s</comment>\n <image>%s</image>\n</item>\n</xkcd>\n", $6, $4, $2)}'

putnamhill · 2009-12-09 15:02:32 4
prints line numbers

Yep, is hard, but is a way more flexible using pipe.
This is sample output - yours may be different.
-1

cat infile | while read str; do echo "$((++i)) - $str" ; done;

glaudiston · 2009-12-09 14:05:09 3
View a random xkcd comic

Only need to install Image Magick package. Display a xkcd comic with its title and save it in /tmp directory If you prefer to view the newest xkcd, use this command: wget -q http://xkcd.com/ -O-| sed -n '/<img src="http:\/\/imgs.xkcd.com\/comics/{s/.*$http:.*$" t.*/\1/;p}' | awk '{system ("wget -q " $1 " -O- | display -title $(basename " $1") -write /tmp/$(basename " $1")");}'
This is sample output - yours may be different.
0

wget -q http://dynamic.xkcd.com/comic/random/ -O-| sed -n '/<img src="http:\/\/imgs.xkcd.com\/comics/{s/.*$http:.*$" t.*/\1/;p}' | awk '{system ("wget -q " $1 " -O- | display -title $(basename " $1") -write /tmp/$(basename " $1")");}'

laugg · 2009-12-09 13:41:25 7
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
recursive search and replace old with new string, inside files

If you can install rpl it's simpler to use and faster than combinations of find, grep and sed. See man rpl for various options. time on above operation: real 0m0.862s, user 0m0.548s, sys 0m0.180s using find + sed: real 0m3.546s, user 0m1.752s, sys 0m1.580s Show Sample Output
This is sample output - yours may be different.
```
john@raffles2:~/Desktop$rpl -R LOCALE LOC**E copy\ of\ ies4linux-2.99.0.1/ 
Replacing "LOCALE" with "LOC**E" (case sensitive) (partial words matched)
..............................................................
A Total of 189 matches replaced in 62 files searched.
```
3

$rpl -R oldstring newstring folder

johnraff · 2009-12-09 03:15:31 9
Optimal way of deleting huge numbers of files

Optimal way of deleting huge numbers of files Using -delete is faster than: find /path/to/dir -type f -print0 | xargs -0 rm find /path/to/dir -type f -exec rm {} + find /path/to/dir -type f -exec rm \-f {} \;
This is sample output - yours may be different.
11

find /path/to/dir -type f -delete

SlimG · 2009-12-09 01:30:52 13
recursive search and replace old with new string, inside files

This command find all files in the current dir and subdirs, and replace all occurances of "oldstring" in every file with "newstring".
This is sample output - yours may be different.
16

find . -type f -exec sed -i s/oldstring/newstring/g {} +

SlimG · 2009-12-09 00:46:13 15
Find and copy scattered mp3 files into one directory

This command copies all filenames in the current dir and subdirs that end in .mp3 regardless of case (also matches .MP3 .mP3 and .Mp3) It copies all the files to the "mp3" folder in your home directory. If you want to see the files that are beeing copied, replace "cp {}" with "cp -v {}"
This is sample output - yours may be different.
1

find . -type f -iname '*.mp3' -exec cp {} ~/mp3/ \;

SlimG · 2009-12-09 00:19:14 5

copy ACL of one file to another using getfacl and setfacl

If you copy windows file in e.g. cygwin the ACL might miss on the copied file. With this command you can copy the ACL of an existing file to another. WARNING: Existing ACL will get lost. Show Sample Output

getfacl <file-with-acl> | setfacl -f - <file-with-no-acl>

tcfusion · 2009-12-08 22:56:35 258

Router discovery
This is sample output - yours may be different.
1

traceroute 2>/dev/null -n google.com | awk '/^ *1/{print $2;exit}'

sputnick · 2009-12-08 21:44:45 24
Find and copy scattered mp3 files into one directory

No problem with word splitting. That should works on many Unix likes. Show Sample Output
This is sample output - yours may be different.
```
@mariusz : find shorter alternative
```
5

find . -iname '*.mp3' -type f -print0 | xargs -I{} -0 cp {} </path>

sputnick · 2009-12-08 20:50:48 6
determine if tcp port is open

for udp nmap -sU -p 80 hostname
This is sample output - yours may be different.
4

nmap -p 80 hostname

solarislackware · 2009-12-08 20:25:28 3
Convert wmv into avi
This is sample output - yours may be different.
4

mencoder infile.wmv -ofps 23.976 -ovc lavc -oac copy -o outfile.avi

eastwind · 2009-12-08 19:50:50 3
Check your hard drive for bad blocks (destructive)

WARNING!!! ALL DATA WILL BE LOST!!! This command should ONLY be run on drives that are meant to be wiped. Data destruction will result from running this command with the '-w' switch. You may run this command with the '-n' switch in place of '-w' if you want to retain all data on the drive, however, the test won't be as detailed, since the '-n' switch provides a non-destructive read-write mode only, whereas '-w' switch actually writes patterns while scanning for bad blocks.
This is sample output - yours may be different.
2

badblocks -c 65536 -o /tmp/badblocks.out -p 2 -s -v -w /dev/hdX > /tmp/badblocks.stdout 2> /tmp/badblocks.stderr

mariusz · 2009-12-08 19:48:25 3
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List programs with open ports and connections

I prefer to use this and not the -n variety, so I get DNS-resolved hostnames. Nice when I'm trying to figure out who's got that port open.

run php code inline from the command line

Most people know that you can run a PHP script from the command line like so: $php ./my_script.php But sometimes I just want to run a quick bit of code, the PHP Command Line Interface allows me to do so with the -r option. Requires package php5-cli

Show a line when a "column" matchs

Show line numbers in a text file

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()

copy audio file from playlist to a floder

copy some file from xx.m3u to target folder

Using commandoutput as a file descriptor

Description is moved to "Sample output" because the html sanitizer for commandlinefu breaks the examples..

Mouse Tracking

Will track your mouse and save it to a file. You can use gnuplot to graph it: $ gnuplot -persist

Use a decoy while scanning ports to avoid getting caught by the sys admin :9

Scan for open ports on the target device/computer (192.168.0.10) while setting up a decoy address (192.168.0.2). This will show the decoy ip address instead of your ip in targets security logs. Decoy address needs to be alive. Check the targets security log at /var/log/secure to make sure it worked.

using tee to echo to a system file with sudo privileges

We sometimes need to change kernel parameters by echoing the file . This needs root privilege and if we do it using sudo like this , it fails $ sudo echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor -bash: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: Permission denied We can achieve this with the tee command by just doing sudo without logging as root user http://www.zaman4linux.in/2010/09/using-tee-to-echo-to-system-file-with.html

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