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Superfast portscanner

Undo
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Default value or argument
I used it for this function, which prints hashes: function liner { num_lines=${1:-42} echo printf %${num_lines}s|tr " " "#" echo } Note the colon-dash, instead of the usual colon-equals.

Discover the process start time
That is useful to discover the start time of process older than 1 day. You can also run: $ ls -ld /proc/PID That's returning the creation date of the proc files from the process. Some users reported that this way might show you a wrong date since any other process like cron, for example, could change this date.

check open ports without netstat or lsof

Follow a new friend on twitter
replace username, password, and nameofnewfriend with proper values. Remember to escape things like ! or & in your password

parrallel execution of a command on remote hosts by ssh or rsh or ...
parrallel execution of a command on remote host by ssh or rsh or ... very useful for cluster management (software update)

Grab the top 5 CLFUContest one-liners

Backup sda5 partition to ftp ( using pipes and gziped backup )

Git Global search and replace
Find all the occurrences in the git repo of 'foo' and replace with 'bar'


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