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get time in other timezones

prints out the time for the timezone specified in $offsetutc. So you have less to think about things like: "I'm in utc+4 and my friend in utc-7, can I call him now or will I wake him?" Note: $offsetutc should be an integer between -12 and 12. Show Sample Output
This is sample output - yours may be different.
```
utc:   Fri Aug  7 23:07:24 UTC 2009
utc+2: Sat Aug  8 01:07:24 UTC 2009
```
0

let utime=$offsetutc*3600+$(date --utc +%s)+3600; date --utc --date=@${utime}

flokra · 2009-08-07 23:12:14 3
pipe commands from a textfile to a telnet-server with netcat

sends commands specified in $commandfile to the telnet-server specified by $telnetserver. to have newlines in $commandfile interpreted as ENTER, save the file in CR+LF (aka "Windows-Textfile") format. if you want to save the output in a separate file, use: nc $telnetserver 23 < $commandfile > $resultfile
This is sample output - yours may be different.
1

nc $telnetserver 23 < $commandfile

flokra · 2009-08-07 21:32:38 4
Get your external IP address
This is sample output - yours may be different.
-2

wget http://checkip.dyndns.org && clear && echo && echo My IP && egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}' index.html && echo && rm index.html

onkelchentobi · 2009-08-07 21:21:59 4
complete extraction of a debian-package

extracts the debian-package $debfile to $extractdir, including all packaging-information. to repack the package, just type: dpkg-deb -b $extractdir
This is sample output - yours may be different.
1

dpkg-deb -x $debfile $extractdir; dpkg-deb -e $debfile $extractdir/DEBIAN;

flokra · 2009-08-07 20:33:43 4
Get the size of all the directories in current directory
This is sample output - yours may be different.
1

sudo du -sh $(ls -d */) 2> /dev/null

Code_Bleu · 2009-08-07 19:00:09 4
Get the ip registered to a domain on OpenWRT

I use this in a script on my openwrt router to check if my DynDNS needs to be updated, saves your account from being banned for blank updates. Show Sample Output
This is sample output - yours may be different.
```
208.94.116.176
```
1

nslookup commandlinefu.com|sed 's/[^0-9. ]//g'|tail -n 1|awk -F " " '{print $2}'

thundernode · 2009-08-07 17:32:55 7
Copy ssh keys to user@host to enable password-less ssh logins.

Same as original just no $ at start
This is sample output - yours may be different.
5

ssh-copy-id user@host

matthewbauer · 2009-08-07 16:36:19 20
gets the bare ip(s) of a domain

Strips the non-ip information from the dig output. Could be combined with "head -1" to ensure a single ip is returned. Useful for outputting as a variable for use in scripts. Show Sample Output
This is sample output - yours may be different.
```
208.94.117.60
208.94.116.176
208.94.117.125
```
0

dig commandlinefu.com | sed -nr 's/^[^;].*?\s([.0-9]{7,15})$/\1/ p'

birnam · 2009-08-07 16:11:31 4
Get a list of all your VirtualBox virtual machines by name and UUID from the shell

A similar command that lists only the currently running VMs is thus: VBoxManage list runningvms ...the above showing a list of VMs by name and UUID in the same format as the "$ VBoxManage list vms" command Show Sample Output
This is sample output - yours may be different.
```
VirtualBox Command Line Management Interface Version 2.2.4
(C) 2005-2009 Sun Microsystems, Inc.
All rights reserved.

"winxp-ie6" {487b8e10-e2f8-480c-a0be-a20b51d86848}
"winxp-ie7" {b5a97304-de94-4a6c-8d7c-88fa9d9054e0}
"winxp-ie8" {cb6f9885-1f27-479d-aea3-2b8b96deb628}
```
3

VBoxManage list vms

linuxrawkstar · 2009-08-07 12:43:04 4
run a VirtualBox virtual machine without a gui

you can launch a VirtualBox VM from the command line using VBoxManage, but that invokes it in a gui environment. If you want to just fire off your VM in the background, use VBoxHeadless as shown. To get the names and UUIDs of your VirtualBox VMs, type: VBoxManage list
This is sample output - yours may be different.
5

VBoxHeadless -s <name|uuid>

linuxrawkstar · 2009-08-07 12:36:32 4
Get internal and external IP addresses

Gets the internal and external IP addresses of all your interfaces, or the ones given as arguments Show Sample Output
This is sample output - yours may be different.
```
nathan@lion:~$ ips
lo   127.0.0.1      127.0.0.1
eth0 192.168.1.2    80.106.232.129
nathan@lion:~$ ips eth0
eth0 192.168.1.2    80.106.232.129
```
-3

ips(){ for if in ${1:-$(ip link list|grep '^.: '|cut -d\ -f2|cut -d: -f1)};do cur=$(ifconfig $if|grep "inet addr"|sed 's/.*inet addr:$[0-9\.]*$.*/\1/g');printf '%-5s%-15s%-15s\n' $if $cur $(nc -s $cur sine.cluenet.org 128 2>/dev/null||echo $cur);done;}

frozenfire · 2009-08-07 10:04:46 3
Sum columns from CSV column $COL
This is sample output - yours may be different.
5

perl -ne 'split /,/ ; $a+= $_[3]; END {print $a."\n";}' -f ./file.csv

ioggstream · 2009-08-07 09:35:52 3
Generate random password

Generates password consisting of alphanumeric characters, defaults to 16 characters unless argument given. Show Sample Output
This is sample output - yours may be different.
```
frozenfire@sine:~$ randpw 10
9qDVnEYNGx
frozenfire@sine:~$ randpw
6PkWNDsFVTiuKmpX
```
3

randpw(){ < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;}

frozenfire · 2009-08-07 07:30:57 7

benchmark web server with apache benchmarking tool

-n 9000 : Number of requests to perform for the benchmarking session -c 900 : Number of multiple requests to perform at a time Show Sample Output

ab -n 9000 -c 900 localhost:8080/index.php

amaymon · 2009-08-07 07:19:40 7

Go to parent directory of filename edited in last command
This is sample output - yours may be different.
5

cd `dirname $_`

amaymon · 2009-08-07 07:08:31 3
Generate Random Passwords
This is sample output - yours may be different.
0

dd if=/dev/urandom count=200 bs=1 2>/dev/null | tr "\n" " " | sed 's/[^a-zA-Z0-9]//g' | cut -c-16

amaymon · 2009-08-07 06:32:55 5
Go to parent directory of filename edited in last command

Uses the last argument of the last executed command, and gets the directory name from it. Use $!:t for the filename alone, without the dirname. Show Sample Output
This is sample output - yours may be different.
```
user@host:/home$ vim /path/to/file.txt
user@host:/home$ cd !$:h
user@host:/path/to$ 
```
25

cd !$:h

lingo · 2009-08-07 00:37:08 10
Backup all MySQL Databases to individual files
This is sample output - yours may be different.
34

for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > "$I.sql.gz"; done

lingo · 2009-08-07 00:25:23 34
Test http request every second, fancy display.

Use the command watch, which is really hard to pass nested quotes to, and insert newlines where they are supposed to go in the HTTP request. that is after 1.1 after the host and two newlines at the end before the EOF. i use this all day what? no support for HEREDOCs on commandlinefu's interface? need more fu. Show Sample Output
This is sample output - yours may be different.
```
Every 1.0s: nc localhost 80 <<EOF                                                                                   Thu Aug  6 16:14:12 2009

HTTP/1.1 200 OK
Date: Thu, 06 Aug 2009 23:14:12 GMT
Server: Apache/2.2.11 (Debian) PHP/5.2.10-2 with Suhosin-Patch mod_python/3.3.1 Python/2.5.4 mod_perl/2.0.4 Perl/v5.10.0
Last-Modified: Tue, 12 May 2009 03:37:41 GMT
ETag: "54db7-2d-469aed1260b40"
Accept-Ranges: bytes
Content-Length: 45
Vary: Accept-Encoding
Connection: close
Content-Type: text/html

<html><body><h1>It works!</h1></body></html>
```
1

watch -n 1 nc localhost 80 '<<EOF GET / HTTP/1.1 Host: tux-ninja Connection: Close EOF'

JustinHop · 2009-08-06 23:20:31 4
Copy files from list with hierarchy

If you want certain files out of a directory hierarchy, this will copy just the listed files, but will create the directory hierarchy in the new location ($DIR/)
This is sample output - yours may be different.
0

cat files.txt | xargs tar -cv | tar -x -c $DIR/

lingo · 2009-08-06 22:55:21 6
Get your internal IP address and nothing but your internal IP address

Will return your internal IP address. Show Sample Output
This is sample output - yours may be different.
```
192.168.1.6
```
4

ifconfig $devices | grep "inet addr" | sed 's/.*inet addr:$[0-9\.]*$.*/\1/g'

matthewbauer · 2009-08-06 21:43:22 3
Delete empty directories with zsh

This command uses the recursive glob and glob qualifiers from zsh. This will remove all the empty directories from the current directory down. The **/* recurses down through all the files and directories The glob qualifiers are added into the parenthesis. The / means only directories. The F means 'full' directories, and the ^ reverses that to mean non-full directories. For more info on these qualifiers see the zsh docs: http://zsh.dotsrc.org/Doc/Release/Expansion.html#SEC87
This is sample output - yours may be different.
5

rm -d **/*(/^F)

claytron · 2009-08-06 21:41:19 9
renombrar un archivo que inicia con guion

Show Sample Output
This is sample output - yours may be different.
```
$ ls 
algo.txt -help
$ mv '-help' help.txt
mv: opci?n inv?lida -- h
Pruebe `mv --help' para m?s informaci?n.
$ find . -name "-help" -exec mv {} help.txt \;
$ ls
algo.txt help.txt
```
-7

find . -name "-help" -exec mv {} help.txt \;

petrohs · 2009-08-06 20:43:30 8
Send SNMP traps
This is sample output - yours may be different.
0

sudo snmptrap -m ALL -v 2c -c public trapserver "" UCD-DEMO-MIB::ucdDemoPublic SNMPv2-MIB::sysLocation.0 s "Just here"

vutcovici · 2009-08-06 17:32:16 20
Create a backup of the file.

It will create a backup of the filename. The advantage is that if you list the folder the backups will be sorted by date. The command works on any unix in bash. Show Sample Output
This is sample output - yours may be different.
```
$ cp test.txt{,-$(date +%Y-%m-%d)}
$ ls -l test.txt*
-rw-rw-r--  1 user group 0 Aug  6 13:40 test.txt
-rw-rw-r--  1 user group 0 Aug  6 13:41 test.txt-2009-08-06
```
1

cp path/filename{,-$(date +%Y-%m-%d)}

vutcovici · 2009-08-06 13:50:00 5
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Skip banner on ssh login prompt

This allows you to skip the banner (usually /etc/issue.net) on ssh connections. Useful to avoid banners outputted to your mail by rsync cronjobs.

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)

Instantly load bash history of one shell into another running shell

By default bash history of a shell is appended (appended on Ubuntu by default: Look for 'shopt -s histappend' in ~/.bashrc) to history file only after that shell exits. Although after having written to the history file, other running shells do *not* inherit that history - only newly launched shells do. This pair of commands alleviate that.

multiline data block parse and CSV data extraction with perl

extract data in multiline blocks of data with perl pattern matching loop

list all file extensions in a directory

... plus do a sort according frequency

mix video and audio

-map 0.0:0 map the video of video.mp4 to the video of mix.mp4 -map 1.0:1 map the audio of audio.mp3 to the audio of mix.mp4 make sure that video.mp4 and audio.mp3 have the same duration

Find pages returning 404 errors in apache logs

Finds the top ten pages returning an http response code of 404 in an apache log.

Remove newlines from output

?Cat and grep? You can use only grep ("grep \. filename"). Better option is awk.

Watch the progress of 'dd'

Running this code will execute dd in the background, and you'll grab the process ID with '$!' and assign it to the 'pid' variable. Now, you can watch the progress with the following: $ while true; do kill -USR1 $pid && sleep 1 && clear; done The important thing to grasp here isn't the filename or location of your input or output, or even the block size for that matter, but the fact that you can keep an eye on 'dd' as it's running to see where you are at during its execution.

quickly backup or copy a file with bash

This inserts timestamp instead of .bak extension.

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