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Full Discussion: Unix redirection to '&-'
Top Forums UNIX for Dummies Questions & Answers Unix redirection to '&-' Post 302134498 by ranj@chn on Friday 31st of August 2007 07:26:44 AM
Old 08-31-2007
Closing the error stream

I think the line
Code:
. $HOME/.profile 2>&-

closes the error stream. So, If your shell script writes to the error stream or any command produces errors, it doesnt get displayed on to the terminal. For example,
Code:
exec 2>&-
echo "Does this get printed??"
grep junk filename ##filename doesnot exist

gives,
Code:
rkumar@bdc4reteaix1w: /home/rkumar/unix_forum >./teststream
Does this get printed??

if i change the lines to
Code:
exec 1>&-
echo "Does this get printed??"
grep junk filename

then,
Code:
rkumar@bdc4reteaix1w: /home/rkumar/unix_forum >./teststream
grep: 0652-033 Cannot open filename

 

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ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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