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Rename files in batch

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

Maximum PNG compression with optipng, advpng, and advdef
optipng and advancecomp (for the the advpng and advdef tools) are the best FOSS tools for losslessly compressing PNGs. With the above tool chain, you can cut off as much as 20% off a PNG's file size.

Add all unversioned files to svn
No need for grep, let awk do the match. This will not behave properly if the filenames contains whitespace, which is awk's default field separator.

get all Amazon cloud (amazonws etc) ipv6 subnets

Rename files in batch

How to know the total number of packages available

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

disable history for current shell session

Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.


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