luisuribe/shell shortcuts

## shell shortcuts
// Empty a file from the command line
$ cat /dev/null > t

// Use last parameter
$ ls /home/acme/norad
$ rm !$

#Send a file as an attachment (ssmtp previously configured)
mpack -s "Un subject" un_fichero mailto:direccion@de.correo direccion@de.correo

# To extract a range of lines, say lines 2 to 4, you can execute either of the following (From http://linuxcommando.blogspot.com/2008/03/using-sed-to-extract-lines-in-text-file.html):
sed -n 2,4p somefile.txt
	// Empty a file from the command line
	$ cat /dev/null > t

	// Use last parameter
	$ ls /home/acme/norad
	$ rm !$

	#Send a file as an attachment (ssmtp previously configured)
	mpack -s "Un subject" un_fichero mailto:direccion@de.correo direccion@de.correo

	# To extract a range of lines, say lines 2 to 4, you can execute either of the following (From http://linuxcommando.blogspot.com/2008/03/using-sed-to-extract-lines-in-text-file.html):
	sed -n 2,4p somefile.txt