Under Construction

UNIX and Linux come with a wide variety of commands you can type in a terminal window or put together in a shell script file.
E.g. ed, sort, grep (global regular expression parser - i.e. search), diff...
See:
Basic UNIX Tools
50 Most Frequently Used UNIX / Linux Commands (With Examples)


Some of my tools: Remove hex codes e.g. %40=@
I use this to remove these codes from javascript bookmarklets so they will work in the dolphin browser on android.
past the following into a file e.g. ed-hex
s/%20/ /g
s/%21/!/g
s/%22/"/g
s/%23/#/g
s/%24/$/g
s/%25/%/g
s/%26/\&/g
s/%27/'/g
s/%28/(/g
s/%29/)/g
s/%2A/*/g
s/%2B/+/g
s/%2C/,/g
s/%2D/-/g
s/%2E/./g
s:%2F:/:g
s/%3A/:/g
s/%3B/;/g
s/%3C//g
s/%3F/?/g
s/%40/@/g
s/%5B/[/g
s/%5C/\\/g
s/%5D/]/g
s/%5E/^/g
s/%5F/_/g
s/%60/`/g
s/%7B/{/g
s/%7C/|/g
s/%7D/}/g
s/%7E/~/g
s/%0D/\
/g
s/&/\&/g

then enter sed -f ed-hex YOURjavascript

Links:
Unix Shell Scripting Tutorial
UNIX commands on android
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last updated 30 Oct 2013