Shell
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Shell

Number of opened files

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Bash

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Perl

Perl: List of files in DIR

Perl: File date test

Perl: Bash variable in Perl

Perl: Convert uppercase string to lowercase

Perl: Loging into file

Perl: STAT module

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Utilities

AWK

Grep

GZip

Find

Screen

Sending mails from command line

Vi(m)

Patch

Sed

Tail

Tar

ulimit

Test '[]'

Wget

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WEBs

http://wiki.bash-hackers.org/commands/classictest

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