fastjar is an implementation of Sun's jar utility that comes with
the JDK, written entirely in C, and runs in a fraction of the time while
being feature compatible.
If any file is a directory then it is processed recursively. The
manifest file name and the archive file name needs to be specified in
the same order the -m and -f flags are specified.
Exactly one of the following actions must be specified:
-c
-t
-x
-u
The following parameters are optional:
-@
-c or -u.
Non standard option added in the GCC version.
-C directory
-E
-M
-0
-V
--version
-f archive
-m manifest
-v
All remaining options are considered to be names of files.