What are the most often linux (power) commands that you use?

shutdown

cd /home
du -s * | sort -k1 -n

16  lost+found
     84  daniel
   4284  george
   6308  alice
4413700  bob

cd /home/bob
du -s * | sort -k1 -n

100  src
4413600  p0rn

find root_dir -type d -exec chmod 555 {} ;
find root_dir -type f -exec chmod 444 {} ;

# count number of lines in all .java and .py files
wc -l **/*.{java,py}

#!/bin/sh
ps axxw | grep $1 | grep -v grep | grep -v boost
sudo renice -20 `ps axww | grep $1 | grep -v grep | grep -v boost | awk '{print $1}'`

grep -RHi "string"

perl -wnl -00 -e '/something:/ and print;'

perl -s -i.bak -wpl 's/old_string/new_string/g;' *.txt

sdiff -s file1 file2

diff file1 file2 | vim - # or mate - on my Mac

grep -ri 'string'

perl -pi -e 's!rn!n!g' << filename >>

ps -ax
kill [n]

hack [targetPC]
nuke [targetPC]
sol    <--this is solitaire
/.     <--opens up slash dot in IE
quote  <--quotes a /. meme from the following list so you can use it to post on /.
       1 Yes but does it run linux?
       2 Can you imagine a Beowulf cluster of those
       3 In Soviet Russia ...
       4 ...
       5 Profit.

ps afx | grep 'foo'

grep -r 'foo' *

chmod -R +x *

cat /dev/null > file

rm -rf /

find . -name * -print0  | xargs -0 grep -iH "String"

sed -i "regexp" $file

grep --color -Rne "regexp" file list

alias ls="/bin/ls --color"
alias ll="ls -l"

du -shc *

vim

screen
screen -DR

# umount /foo
umount: /foo busy

lsof | grep /foo

1339 /bin/bash ... ... ... cwd ... ... ...

find / -name foo.txt

egrep -rniI --color "$1" * | egrep -v ".svn" | egrep --color -iE "$1|"44