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Full Discussion: Sqlplus code format
Top Forums UNIX for Beginners Questions & Answers Sqlplus code format Post 302990380 by Corona688 on Wednesday 25th of January 2017 03:24:24 PM
Old 01-25-2017
Quote:
Originally Posted by mohca2020
I don't get what the pipe to grep -p is doing and the
Code:
if [ $? -eq 0 ]
then
DB_STATUS="UP"

part. I understand that it's trying to search for "Connected to:" and then send the output to /dev/null. Then if the output of the previous command is 0, the DB_STATUS is set to UP. I just don't understand the logic.

Thank you for your time.
The logic is, If the outputted text contains "Connected do", set DB_STATUS=up. There's really no more to it than that. Presumably sqlplus won't print that when it's not connected, and DB_STATUS will be left at whatever it was before, presumably nothing.

Why are they setting that variable? I have no idea. What uses that variable?
 

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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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