linux shell tricks Cheat Sheet

The top 30 Linux shell tricks

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”
	^Morld^World
	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 ‘ .’
Salvage a borked terminal	reset
List currently mounted filesystems in nice layout	mount \| column -t
Get your external IP address	curl ifconfig.me
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.example.com
Clear the terminal screen	[ctrl+l]
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 reachablehost ssh unreachablehost
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	[command]
Delete all files in a folder that don’t match a certain file extension	rm !(.foo\|.bar\|*.baz)
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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