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Get a range on line with sed (first two)
Get the two first lines of a file and quit.

tail: watch a filelog
-f file(s) to be monitorized -n number of last line to be printed on the screen in this example, the content of two files are displayed

Delete All Objects From An S3 Bucket Using S3cmd

Use AWS CLI and JQ to get a list of instances sorted by launch time
Use the AWS CLI tools to generate a list instances, then pipe them to JQ to show only their launch time and instance id. Finally use sort to bring them out in runtime order. Find all those instances you launched months ago and have forgotten about.

Rename files in batch

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Create a QR code image in MECARD format
Add the QR code image on your webpage, business card ., etc, so people can scan it and quick add to their Contact Address Book. Tested on iPhone with QRreader.

Set all CPU cores' CPU frequency scaling governor to maximum performance

strips the first field of each line where the delimiter is the first ascii character

search google on os x
Searches Google, but requires no "", and will also search all terms input in the CL, eg: > google foo bar returns search URL "http://www.google.com/search?q=foo%20bar" You could also use awk to replace all spaces with a +, which is how the Google search handles spaces, but that makes it more than one line.


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