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Top 30 linux shell tricks Cheat Sheet by

The top 30 Linux shell tricks from

Top 30

Run the last command as root
sudo !!
Serve current directory tree at http://$HOSTNAME:8000/
python -m Simple­HTT­PServer
Runs previous command but replacing
echo "­Hello Morld"
echo "­Hello World"
Rapidly invoke an editor to write a long command
[ctrl+x e]
Place the argument of the most recent command on the shell
'ALT+.' or '<E­SC> .'
Salvage a borked terminal
List currently mounted filesystems in nice layout
mount | column -t
Get your external IP address
curl ifconf­
Execute a command at a given time
 echo "ls -l" | at midnight
Output your microphone to a remote computer's speaker
dd if=/de­v/dsp | ssh -c arcfour -C userna­me@host dd of=/de­v/dsp
Type partial command, check something, resume typing
vi /etc/ssh/ [ctrl+u]
ls -lisa /etc/ssh/
[ctrl+y] vi /etc/s­sh/­ssh­_config
Mount folder/filesystem through SSH
sshfs name@s­erv­er:­/pa­th/­to/­folder /path/­to/­mou­nt/­point
Mount a temporary ram partition
mount -t tmpfs tmpfs /mnt -o size=1024m
Download an entire website
wget --rand­om-wait -r -p -e robots=off -U mozilla http:/­/ww­w.e­xam­
Clear the terminal screen
Compare a remote file with a local file
ssh user@host cat /path/­to/­rem­otefile | diff /path/­to/­loc­alfile -
Update twitter via curl
curl -u user:pass -d status­="Tw­eeting from the shell" http:/­/tw­itt­er.c­om­/st­atu­ses­/up­dat­e.xml`
SSH connection through host in the middle
ssh -t reacha­ble­_host ssh unreac­hab­le_host
Close shell keeping all subprocess running
disown -a && exit
Make 'less' behave like 'tail -f'
less +F somelo­gfile
Put a console clock in top right corner
while sleep 1;do tput sc;tput cup 0 $(($(tput cols)-­29)­);d­ate­;tput rc;done &
Shutdown a Windows machine from Linux
net rpc shutdown -I ipAddr­ess­OfW­ind­owsPC -U userna­me%­pas­sword
List of commands you use most often
history | awk '{a[$2­]++­}EN­D{for(i in a){print a[i] " " i}}' | sort -rn | head
32 bits or 64 bits?
getconf LONG_BIT
Set audible alarm when an IP address comes online
ping -i 60 -a IP_address
Reboot machine when everything is hanging
<al­t> + <print screen/sys rq> + <R> - <S> - <E> - <I> - <U> - <B>
Simulate typing
 echo "You can simulate on-screen typing just like in the movies­" | pv -qL 10
Quickly rename a file
mv filena­me.{­ol­d,new}
Escape any command aliases
Delete all files in a folder that don't match a certain file extension
rm !(.foo|.bar|*.baz)

Bonus: Tricks of the ancient UNIX masters

Reuse all parameter of the previous command line
Sharing file through http 80 port
nc -v -l 80 < file.ext
Display a block of text with AWK
awk '/star­t_p­att­ern­/,/­sto­p_p­att­ern/' file.txt
Kills a process that is locking a file
fuser -k filename
Display all current terminal settings
stty -a
Type a string, hit [ctrl+d] and see the ASCII codes
od -cx


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