Test command

[phcoder]

Hello. Here is an implementation of bash-like "test" command. Many file 
tests are omitted because they are useless in grub (e.g. -c test). I 
also added 3 extension: lexicographical comparing, prefixed -gt and -lt 
(it skips common prefix. Useful for comparing versions. e.g. [ vmlinuz-3 
-plt vmlinuz-11 ] is true) and biased -nt/-ot which adds s specified 
amount of seconds to mtime.
Regards
Vladimir 'phcoder' Serbinenko

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