Can't find the bug in my code - bombing with rename Post: 302986911

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Top Forums UNIX for Beginners Questions & Answers Can't find the bug in my code - bombing with rename Post 302986911 by pilnet101 on Thursday 1st of December 2016 01:47:35 PM

12-01-2016

Registered User

Quote:

Originally Posted by SIMMS7400

Thank you Corona688, I will give this a shot!

What is the purpose of Set -- * in this instance though?

set is a shell built in. It can be used to define environmental variables however in this instance it is being used to evaluate positional parameters based upon what * expands to. For example, if * expands to: file1 file2 file3 file4 file5 , then set will resolve file1 as positional parameter 1 (i.e. $1=file1), file2 as positional parameter 2 (i.e. $2=file2) etc...

The -- is used to denote the end of the options. Meaning that set will consider everything after -- as parameters, not options (as set can take numerous options such as -x). This is particularly useful if any of the parameters start with a -

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xzdiff

XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME

       xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files

SYNOPSIS

       xzcmp [cmp_options] file1 [file2]
       xzdiff [diff_options] file1 [file2]
       lzcmp [cmp_options] file1 [file2]
       lzdiff [diff_options] file1 [file2]

DESCRIPTION

       xzcmp  and  xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options specified are passed
       directly to cmp or diff.  If only one file is specified, then the files compared are file1 (which must have a suffix of	a  supported  com-
       pression  format)  and  file1 from which the compression format suffix has been stripped.  If two files are specified, then they are uncom-
       pressed if necessary and fed to cmp(1) or diff(1).  The exit status from cmp or diff is preserved.

       The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils.

SEE ALSO

       cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1)

BUGS

       Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified.

Tukaani 							    2009-07-05								 XZDIFF(1)