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Finding files with different extensions

This is the way how you can find header and cpp files in the same time.
This is sample output - yours may be different.
7

find . -regex '.*$h\|cpp$'

Vereb · 2009-09-06 11:33:19 10
Fibonacci numbers with sh
This is sample output - yours may be different.
0

prev=0;next=1;echo $prev;while(true);do echo $next;sum=$(($prev+$next));prev=$next;next=$sum;sleep 1;done

sharfah · 2009-09-06 09:38:10 4
Put the machine to sleep after the download(wget) is done

[Note: This command needs to be run as root]. If you are downloading something large at night, you can start wget as a normal user and issue the above command as root. When the download is done, the computer will automatically go to sleep. If at any time you feel the computer should not go to sleep automatically(like if you find the download still continuing in the morning), just create an empty file called nosleep in /tmp directory.
This is sample output - yours may be different.
1

while [ -n "`pgrep wget`" ]; do sleep 2 ;done; [ -e "/tmp/nosleep"] || echo mem >/sys/power/state

kamathln · 2009-09-06 05:51:20 3
Get Futurama quotations from slashdot.org servers
This is sample output - yours may be different.
0

curl -Is slashdot.org | sed -ne '/^X-[FBL]/s/^X-//p'

arcege · 2009-09-06 03:17:19 3
Fibonacci numbers with awk

Does not require input to function or complete. Number of iterations controlled by shell variable $NUM. Show Sample Output
This is sample output - yours may be different.
```
1
1
2
3
5
8
13
21
34
55
89
144
233
377
610
987
1597
2584
4181
6765
10946
17711
28657
```
0

awk 'BEGIN {a=1;b=1;for(i=0;i<'${NUM}';i++){print a;c=a+b;a=b;b=c}}'

arcege · 2009-09-06 03:05:55 4
undo tab close in firefox

This is really not cli but I think it's neat. Show Sample Output
This is sample output - yours may be different.
```
previously closed tab will reopen
```
-10

<ctrl-shift-t>

tobiasboon · 2009-09-05 18:01:32 7
alias to close terminal with :q

Put this in your ~/.bashrc file (or the equivalent) If you use vim a lot, this alias will be immediately obvious. Your brain will thank you.
This is sample output - yours may be different.
9

alias ':q'='exit'

tobiasboon · 2009-09-05 17:59:50 13
Edit your command in vim ex mode by <ctrl-f>

If you are in ex mode in vim i.e. you've pressed ':'. You can edit the current command by pressing <ctrl-f>
This is sample output - yours may be different.
4

<ctrl-f> in ex mode in vim

Vereb · 2009-09-05 14:43:15 4
Show display adapter, available drivers, and driver in use
This is sample output - yours may be different.
1

lspci -v | perl -ne '/VGA/../^$/ and /VGA|Kern/ and print'

unixmonkey5248 · 2009-09-05 11:26:26 3
Makes a Zenity select list based on entries in your wpa_supplicant.conf

If you still connect to your wireless access point manually and need to use wpa_supplicant, the above fu will grep all of the known SSID from your wpa_supplicant.conf file, present it in a Zenity list and return the SSID name you choose. I've wrapped this command in to a bash script that then up's the interface, associates and autenticates. Saves me from using NetworkManager ;)
This is sample output - yours may be different.
1

grep -oE "ssid=\".*\"" /etc/wpa_supplicant.conf | cut -c6- | sed s/\"//g | zenity --list --title="Choose Access Point" --column="SSID"

unixmonkey5449 · 2009-09-05 10:41:05 3
How to copy CD/DVD into hard disk (.iso)

A dear friend of mine asked me how do I copy a DVD to your hard drive? If you want to make a copy of the ISO image that was burned to a CD or DVD, insert that medium into your CD/DVD drive and (assuming /dev/cdrom is associated with your computer?s CD drive) type the following command
This is sample output - yours may be different.
9

dd if=/dev/cdrom of=whatever.iso

0disse0 · 2009-09-05 09:19:41 13
Clone IDE Hard Disk

This command clone the first partition of the primary master IDE drive to the second partition of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)
This is sample output - yours may be different.
5

sudo dd if=/dev/hda1 of=/dev/hdb2

0disse0 · 2009-09-05 09:16:52 4
View the octal dump of a file
This is sample output - yours may be different.
0

od -vt x1 /tmp/spaghettifile

0disse0 · 2009-09-05 09:14:48 3
Add another tty device using mknod command

When you need to add another tty device that can automatically start at boot time
This is sample output - yours may be different.
0

sudo mknod /dev/ttyS4 c 4 68

0disse0 · 2009-09-05 09:12:44 4
cycle through a 256 colour palette

Rainbow, instead of greys
This is sample output - yours may be different.
10

yes "$(seq 1 255)" | while read i; do printf "\x1b[48;5;${i}m\n"; sleep .01; done

unixmonkey4581 · 2009-09-05 04:01:23 9
Capitalize the word with dd
This is sample output - yours may be different.
-1

echo capitalize | { dd bs=1 count=1 conv=ucase 2> /dev/null; cat ;}

twfcc · 2009-09-05 01:49:53 40
Update Ping.fm status

Updates your Ping.fm status and websites supported by ping.fm (like twitter, facebook, and google talk).
This is sample output - yours may be different.
2

curl -d api_key="$api_key" -d user_app_key="$user_app_key -d body="$body" -d post_method="default" http://api.ping.fm/v1/user.post

matthewbauer · 2009-09-04 23:20:33 3
Send a signed and encrypted email from the command line

A very simple command to send a signed and encrypted message from the command line using GPG Keys
This is sample output - yours may be different.
3

echo "SECRET MESSAGE" | gpg -e --armor -s | sendmail USER@DOMAIN.COM

flip387 · 2009-09-04 20:47:12 7
display an embeded help message from bash script header

With this one liner you can easily output a standard help message using the following convention: Usage: is the start marker Stop at the last # Show Sample Output
This is sample output - yours may be different.
```
#!/bin/bash
#
# Usage: do someting really funny
#  --help      This message
#  --force     force be stronger
#  --remove    delete whatyou've done, be CAREFULL
#
# ex:  myfun  dosomething
#
# myfun --force dosomething_REALLY_DO_IT
#

[ "$1" == "--help" ] && { sed -n -e '/^# Usage:/,/^$/ s/^# \?//p' < $0; exit; }

echo really funny !
```
9

[ "$1" == "--help" ] && { sed -n -e '/^# Usage:/,/^$/ s/^# \?//p' < $0; exit; }

syladmin · 2009-09-04 20:36:06 7
Convert ogg to mp3

Converts all ogg files to mp3 files in the current directory.
This is sample output - yours may be different.
-1

for x in *.ogg; do ffmpeg -i "$x" "`basename "$x" .ogg`.mp3"; done

Superhuman · 2009-09-04 20:23:09 7
Send data securly over the net.

Using OpenSSL we can encrypt any input we wish and then use Netcat to create a socket which can be connected to from an externally source (even using a Web Browser)
This is sample output - yours may be different.
10

cat /etc/passwd | openssl aes-256-cbc -a -e -pass pass:password | netcat -l -p 8080

flip387 · 2009-09-04 20:04:24 9
get colorful side-by-side diffs of files in svn with vim

This will diff your local version of the file with the latest version in svn. I put this in a shell function like so: svd() { vimdiff <(svn cat "$1") "$1"; }
This is sample output - yours may be different.
2

vimdiff <(svn cat "$1") "$1"

plasticboy · 2009-09-04 18:41:40 4
Skip over .svn directories when using the

Put the positive clauses after the '-o' option.
This is sample output - yours may be different.
6

find . -name .svn -prune -o -print

arcege · 2009-09-04 17:41:33 3
fetch all revisions of a specific file in an SVN repository

Manages everything through one sed script instead of pipes of greps and awks. Quoting of shell variables is generally easier within a sed script.
This is sample output - yours may be different.
2

svn log fileName | sed -ne "/^r$[0-9][0-9]*$.*/{;s//\1/;s/.*/svn cat fileName@& > fileName.r&/p;}" | sh -s

arcege · 2009-09-04 17:23:45 3
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.
This is sample output - yours may be different.
1

badblocks -vfw /dev/fd0 10000 ; reboot

SuperFly · 2009-09-04 16:57:51 4
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Search inside a folder of jar/zip files

Great for finding which jar some pesky class is hiding in!

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

kde4 lock screen command

If you wish to launch the kde4 screen saver without the password prompt to exit, use this command: $ qdbus org.freedesktop.ScreenSaver /ScreenSaver org.freedesktop.ScreenSaver.SetActive True Also can be done with: $ /usr/lib/kde4/libexec/kscreenlocker --forcelock

Hold off any screensavers/timeouts

Moves the mouse 1 pixel down and to the right, then immediately back again, every 4 minutes. This keeps screensavers from turning on. I have used this extensively and I've never even noticed the mouse movement because it is so subtle.

Check if the Debian package was used since its installation/upgrade.

This script compares the modification date of /var/lib/dpkg/info/${package}.list and all the files mentioned there. It could be wrong on noatime partitions. Here is non-oneliner: #!/bin/sh package=$1; list=/var/lib/dpkg/info/${package}.list; inst=$(stat "$list" -c %X); cat $list | ( while read file; do if [ -f "$file" ]; then acc=$(stat "$file" -c %X); if [ $inst -lt $acc ]; then echo used $file exit 0 fi; fi; done exit 1 )

Create md5sum of files under the current dir excluding some directories

Useful if you want get all the md5sum of files but you want exclude some directories. If your list of files is short you can make in one command as follow: $ find . -type d $ -name DIR1 -o -name DIR2 $ -prune -o -type f -exec md5sum {} \; Alternatively you can specify a different command to be executed on the resulting files.

Generate pretty secure random passwords

These are my favourite switches on pwgen: -B Don't include ambiguous characters in the password -n Include at least one number in the password -y Include at least one special symbol in the password -c Include at least one capital letter in the password It just works! Add a number to set password length, add another to set how many password to output. Example: pwgen -Bnyc 12 20 this will output 20 password of 12 chars length.

silent/shh - shorthand to make commands really quiet

Sometimes I just want to run a command quietly but all that keyboard shifting makes my fingers hurt. This little function does the job eg.: $ if shh type less; then PAGER=less; fi

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"

Escape forward slashes in a variable

For example $ path="/etc/apt/sources.list"; echo ${path//'/'/'\/'} will print $ \/etc\/apt\/sources.list

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