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Full Discussion: Exec command behaviour
Top Forums Shell Programming and Scripting Exec command behaviour Post 302772555 by PikK45 on Tuesday 26th of February 2013 04:42:47 AM
Old 02-26-2013
So RudiC,

I have this
Code:
exec >file1 2>&1
cmd1
cmd2
cmd3
exec >&- 2> &-
cmd4
cmd5

By your explanation, file1 will have the outputs of cmd1, cmd2 & cmd3.
Then exec >&- 2>&- will stop redirecting to file1. Thus outputs of cmd4 & cmd5 will be directed to stdout & stderr.

Is my understanding correct?

---------- Post updated at 03:12 PM ---------- Previous update was at 03:12 PM ----------

So RudiC,

I have this
Code:
exec >file1 2>&1
cmd1
cmd2
cmd3
exec >&- @> &-
cmd4
cmd5

By your explanation, file1 will have the outputs of cmd1, cmd2 & cmd3.
Then exec >&- 2>&- will stop redirecting to file1. Thus outputs of cmd4 & cmd5 will be directed to stdout & stderr.

Is my understanding correct?
 

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lzdiff

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)
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