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Full Discussion: i need diff understanding :)
Top Forums Shell Programming and Scripting i need diff understanding :) Post 302357952 by Scott on Thursday 1st of October 2009 03:55:56 AM
Old 10-01-2009
For line 62 it might be that one of the files does not exist, or that one of the variables $file1 or $file2 are not declared (I can't see where $file1 is declared in your script).

Use
Code:
outPut = $(diff $file1 $file2 2>/dev/null | wc -l)
if [ $outPut == 0 ]; then
...

or better
Code:
diff $file1 $file2 > /dev/null 2>&1
if [ $? -eq 0 ]; then
...

And it pointless to say
Code:
for file2 in *
do
 if [ ! -f $file2 ]; then
   continue
 fi
...

because if * expands nothing the for-loop is not executed, so you can assume that file2 does exist.

And use "set -n" in your script (ksh - or the equivalent for your shell) to check the syntax without running it to see where the errors are.

(oh, and what is the \< all about?)
 

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LEARN ABOUT FREEBSD

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

BUGS

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

Tukaani                                                             2011-03-19                                                           XZDIFF(1)
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