copy cpp files from diresctory to destination maintaining directory structure

find . -iname *.cpp | cpio -pudvm /destination

Change bash appearance

BLUE=`tput setf 1`
GREEN=`tput setf 2`
CYAN=`tput setf 3`
RED=`tput setf 4`
MAGENTA=`tput setf 5`
YELLOW=`tput setf 6`
WHITE=`tput setf 7`


PS1='\[\[$RED\]\u@:\w # \[$CYAN\]'



\a an ASCII bell character (07)
\d the date in "Weekday Month Date" format (e.g., "Tue May 26")
\D{format} the format is passed to strftime(3) and the result
is inserted into the prompt string an empty format
results in a locale-specific time representation.
The braces are required
\e an ASCII escape character (033)
\h the hostname up to the first `.'
\H the hostname
\j the number of jobs currently managed by the shell
\l the basename of the shell's terminal device name
\n newline
\r carriage return
\s the name of the shell, the basename of $0 (the portion following
the final slash)
\t the current time in 24-hour HH:MM:SS format
\T the current time in 12-hour HH:MM:SS format
\@ the current time in 12-hour am/pm format
\A the current time in 24-hour HH:MM format
\u the username of the current user
\v the version of bash (e.g., 2.00)
\V the release of bash, version + patch level (e.g., 2.00.0)
\w the current working directory, with $HOME abbreviated with a tilde
\W the basename of the current working directory, with $HOME
abbreviated with a tilde
\! the history number of this command
\# the command number of this command
\$ if the effective UID is 0, a #, otherwise a $
\nnn the character corresponding to the octal number nnn
\\ a backslash
\[ begin a sequence of non-printing characters, which could be used
to embed a terminal control sequence into the prompt
\] end a sequence of non-printing characters

Clears Firefox` cache without clicking around

rm_cache() { rm -f $HOME/.mozilla/firefox//Cache/* }; alias rmcache='rm_cache'

Encrypted Tarballs

tar -cf - folder/ | gpg -c > folder.tpg

gpg < folder.tpg | tar -xf -

change mac address

ifconfig eth0 hw ether 00:11:22:33:44:55


changes are valid until system is rebooted.

change file extension of all files in a dir of a certain type to another type

for f in *.jpg; do mv "$f" "${f%.jpg}.bmp"; done

Make a directory named with the current date

mkdir `date --iso`

yank argument from previous command

alt + 3 .
yank 3rd argument from previous command

write function for bash

function anyfunction() { ls && cd /home; }

List all system users

$~

List top ten files/directories sorted by size

du -sb *|sort -nr|head|awk '{print $2}'|xargs du -sh

for full list

du -s *|sort -nr|cut -f2|xargs du -sh