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Open Port Check
also could specify port number: lsof -ni TCP:80

Gives you what's between first string and second string included.
If the file content is : - Blah blah blah ABC hello blah blah blah bloh bloh bloh DEF Bah bah bah - You'll get: - ABC hello blah blah blah bloh bloh bloh DEF

OpenDns IP update via curl
Your IP is resolved by OpenDns Server (like a caller ID telephone, every server knows who is calling ;-) Change user:password by yours Be Happy

processes per user counter
use Linux ;)

export iPad App list to txt file
This will generate the same output without changing the current directory, and filepath will be relative to the current directory. Note: it will (still) fail if your iTunes library is in a non-standard location.

Get all IPs via ifconfig
and, a lot uglier, with sed: $ ifconfig | sed -n '/inet addr:/s/[^:]\+:\(\S\+\).*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..

Backup a file with a date-time stamp
1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }

vmstat/iostat with timestamp
Also useful with iostat, or pretty much anything else you want timestamped.

Convert diff output to HTML ins/del

Go (cd) directly into a new temp folder
This command create a new temp directory using mktemp (to avoid collisions) and change the current working directory to the created directory.


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