[cs631apue] handling multiple command options
jschauma at stevens.edu
Sun Oct 9 15:41:44 EDT 2016
mseaton <mseaton at stevens.edu> wrote:
> I am using getopt, works well for single command options which I have
> implemented. However I am having a lot of difficulty handling multiple
> options like ls -la for example. How to combine these two options
> together to produce the desired output?
getopt(3) will process them one by one and do the right thing regardless
of whether '-la' or '-l -a' was given. The manual page for getopt(3)
contains the canonical example for how to process command-line flags by
iterating over whatever getopt(3) gives you and setting internal
> another question I have in regard to getopt is how does it handle file
getopt(3) does not handle file names. It only processes flags.
> I have separately written a function which handles all
> combinations of file name operands without command options.
I'm not sure I understand. The ls(1) command you're implementing does
not have any flags that accept a filename as a specific argument for
just that flag. After all command-line options are processed, the
remaining arguments are to be treated as pathnames, which need to be
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