Commands by wgzhao (1)

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Display the output of a command from the first line until the first instance of a regular expression.
If BREs can be used, this sed version will also get the job done.

Find and delete oldest file of specific types in directory tree
This works on my ubuntu/debian machines. I suspect other distros need some tweaking of sort and cut. I am sure someone could provide a shorter/faster version.

RELINK a lot of broken symlinks - FIX broken symlinks after rsync site to new server
After you run this script, you can check status for broken symlink with this command: find -L . -type l

Generate a quick, lengthy password

Create a file of a given size in linux
if the fs support sparse file,using truncate can create sparse file. http://en.wikipedia.org/wiki/Sparse_file

Mirror the NASA Astronomy Picture of the Day Archive
Mirror the entire NASA Astronomy Picture of the Day archive, all the way from 1995. The archive is close to 2.5 GB, with lots of files, so give it some time. The logs can be redirected to a file using '-o somefile'. You might also want to try '-nH' and the '--cut-dirs' options

Calculates the number of physical cores considering HyperThreading in AWK
Check whether hyperthreading is enabled or not. a better solution as nproc should work on all OS with awk

Filter IP's in apache access logs based on use
The first sort is necessary for ips in a list to be actually unique.

Just convert your all books DJVU format to PDF, with one line

Install pip with Proxy
Installs pip packages defining a proxy


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