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Full Discussion: Assigning evaluated expression to a variable
Top Forums UNIX for Dummies Questions & Answers Assigning evaluated expression to a variable Post 302217089 by Vi-Curious on Tuesday 22nd of July 2008 12:55:30 AM
Old 07-22-2008
Code:
 
#!/usr/bin/bash
i=test.txt
j=B10
var1=SERVER_"$j"
echo "DBSERVER = $var1"
eval var1=`grep "^DBSERVER=" "$i" | cut -d"=" -f2`
echo "DBSERVER = $var1"

With file test.txt containing:
Code:
 
line 1
 DBSERVER=SERVER_XXX
line 3
DBSERVER=SERVER_A1
line 5

Produces the following when run:
Code:
 
HOSTNAME:> test.sh
DBSERVER = SERVER_B10
DBSERVER = SERVER_A1

 

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LEARN ABOUT XFREE86

zgrep

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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