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how to access variables in a config file inside a shell script

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Top Forums Shell Programming and Scripting how to access variables in a config file inside a shell script
# 8  
Old 06-16-2009
no need that many tools. use just awk
Code:
set -- $(awk -F"=" '$1=="a"{ram=$2}
$1=="b"{shaym=$2}
$1=="c"{hari=$2}
END{
 print ram,shaym,hari
}' file)
echo $1
echo $2
echo $3

with bash
Code:
while IFS="=" read -r a b
do
 case $a in
 "a") ram=$b;;
 "b") shyam=$b;;
 "c") hari=$b;;
 esac
done < file
echo $ram,$shyam,$hari
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LEARN ABOUT DEBIAN

pegasus-config

PEGASUS-CONFIG(1)														 PEGASUS-CONFIG(1)

NAME

       pegasus-config - The authority for where parts of the Pegasus system exists on the filesystem. pegasus-config can be used to find libraries
       such as the DAX generators.

SYNOPSIS

       pegasus-config [-h] [--help] [-V] [--version] [--noeoln]
		      [--perl-dump] [--perl-hash] [--python-dump] [--sh-dump]
		      [--bin] [--conf] [--java] [--perl] [--python]
		      [--python-externals] [--schema] [--classpath]
		      [--local-site] [--full-local]

DESCRIPTION

       pegasus-config is used to find locations of Pegasus system components. The tool is used internally in Pegasus and by users who need to find
       paths for DAX generator libraries and schemas.

OPTIONS

       -h, --help
	   Prints help and exits.

       -V, --version
	   Prints Pegasus version information

       --perl-dump
	   Dumps all settings in perl format as separate variables.

       --perl-hash
	   Dumps all settings in perl format as single perl hash.

       --python-dump
	   Dumps all settings in python format.

       --sh-dump
	   Dumps all settings in shell format.

       --bin
	   Print the directory containing Pegasus binaries.

       --conf
	   Print the directory containing configuration files.

       --java
	   Print the directory containing the jars.

       --perl
	   Print the directory to include into your PERL5LIB.

       --python
	   Print the directory to include into your PYTHONLIB.

       --python-externals
	   Print the directory to the external Python libraries.

       --schema
	   Print the directory containing schemas.

       --classpath
	   Builds a classpath containing the Pegasus jars.

       --noeoln
	   Do not produce a end-of-line after output. This is useful when being called from non-shell backticks in scripts. However, order is
	   important for this option: If you intend to use it, specify it first.

       --local-site [d]
	   Create a site catalog entry for site "local". This is only an XML snippet without root element nor XML headers. The optional argument
	   "d" points to the mount point to use. If not specified, defaults to the user's $HOME directory.

       --full-local [d]
	   Create a complete site catalog with only site "local". The an XML snippet without root element nor XML headers. The optional argument
	   "d" points to the mount point to use. If not specified, defaults to the user's $HOME directory.

EXAMPLE

       To set the PYTHONPATH variable in your shell for using the Python DAX API:

	   export PYTHONPATH=`pegasus-config --python`

       To set the same path inside Python:

	   config = subprocess.Popen("pegasus-config --python-dump", stdout=subprocess.PIPE, shell=True).communicate()[0]
	   exec config

       To set the PERL5LIB variable in your shell for using the Perl DAX API:

	   export PERL5LIB=`pegasus-config --perl`

       To set the same path inside Perl:

	   eval `pegasus-config --perl-dump`;
	   die("Unable to eval pegasus-config output: $@") if $@;

       will set variables a number of lexically local-scoped my variables with prefix "pegasus_" and expand Perl's search path for this script.

       Alternatively, you can fail early and collect all Pegasus-related variables into a single global %pegasus variable for convenience:

	   BEGIN {
	       eval `pegasus-config --perl-hash`;
	       die("Unable to eval pegasus-config output: $@") if $@;
	   }

AUTHOR

       Pegasus Team http://pegasus.isi.edu

								    05/24/2012							 PEGASUS-CONFIG(1)