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POHow to handle "--" in the shell script arguments?
 

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  1. POHow to handle "--" in the shell script arguments?
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    <p>This question has 3 parts, and each alone is easy, but combined together is not trivial (at least for me) :)</p> <p>Need write a script what should take as its arguments:</p> <ol> <li>one name of another command</li> <li>several arguments for the command</li> <li>list of files</li> </ol> <p>Examples:</p> <pre><code>./my_script head -100 a.txt b.txt ./xxx/*.txt ./my_script sed -n 's/xxx/aaa/' *.txt </code></pre> <p>and so on.</p> <p>Inside my script for some reason I need distinguish</p> <ul> <li>what is the command</li> <li>what are the arguments for the command</li> <li>what are the files</li> </ul> <p>so probably the most standard way write the above examples is:</p> <pre><code>./my_script head -100 -- a.txt b.txt ./xxx/*.txt ./my_script sed -n 's/xxx/aaa/' -- *.txt </code></pre> <p><strong>Question1:</strong> Is here any better solution?</p> <p>Processing in ./my_script (first attempt):</p> <pre><code>command="$1";shift args=`echo $* | sed 's/--.*//'` filenames=`echo $* | sed 's/.*--//'` #... some additional processing ... "$command" "$args" $filenames #execute the command with args and files </code></pre> <p>This solution will fail when the <code>filenames</code> will contain <code>spaces</code> and/or '--', e.g.<br> /some--path/to/more/idiotic file name.txt</p> <p><strong>Question2:</strong> How properly get <code>$command</code> its <code>$args</code> and <code>$filenames</code> for the later execution?</p> <p><strong>Question3:</strong> - how to achieve the following style of execution?</p> <pre><code>echo $filenames | $command $args #but want one filename = one line (like ls -1) </code></pre> <p>Is here nice shell solution, or need to use for example perl?</p>
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      1. POHow to handle "--" in the shell script arguments?
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    1. COThis would take a while to answer properly. 1. why use back-tics? They are way deprecated and unless you expect to be doing a lot of work on Solaris or AIX as root, not necessary. Use $(cmd)! 2. (more to your question), read up on getopt and getopts (for shell). I have seen numerous examples here, at least one that is quite detailed. Coupled with something like `while (( $# > 0 )) do processArgs ; shift ; done` will help. 3. consider using case statements. For `--` you might have to escape them or quote them or convert it to a charclass like `[-][-].
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