0 = success
1 = (t)csh is not supported
2 = a library is missing
3 = to many grep modes given
4 = invalid option given
5 = a given option requires an argument
6 = url is missing
7 = url doesn't begin with a wget compatible scheme
101 = logfile not set
102 = dir for logfile not writable
103 = logfile already exists but is not writable 104 = a wanted binary is not installed
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