The Korn shell (ksh) is a shell with advanced scripting features, commonly found on commercial unices and some BSD systems but rarely used on Linux.

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Reason for ksh obsoleting -eq

The latest version of ksh obsoletes using -eq within [[ ]] blocks, prefering (( )) instead. Why is this? I can't find any documentation on the advantages of (( )) over [[ ]] anywhere, and I find that ...
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bash get file name and extension [duplicate]

Possible Duplicate: bash : get file extension I have file names like below filename.jar filename.tar.gz filename with no extension ...
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How to have separate command history for different sessions for the same user?

I face this issue on some of Unix servers. When I open different session for same user, command history is shared by all the session. This creates issues if by mistake I press Ctrl-P or up arrow and ...