Parameter parsing Post: 302999547

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Top Forums Shell Programming and Scripting Parameter parsing Post 302999547 by user052009 on Thursday 22nd of June 2017 11:01:23 AM

06-22-2017

Registered User

Parameter parsing

Hi. I need to parse a string with several optional parameters such as the following:

Code:

PARAMS="-server testserver -type standby -host testhost1"

How can I parse this to place any values after the -parameter into a new variable? E.g I want to place testserver into a variable called SERVER. But importantly, sometimes the parameters may have no values and sometimes the actual -param itself may not be in the string and also there will be an optional (preceding) DEBUG value.

I've tried a while loop with a case statement but it doesn't handle the situation when the -param is not included.

Code:

arg="DEBUG -dbversion 11.2.0.4.0 -type standby -host "
 typeset flags_args=''
for arg; do
if [[ $arg == -* ]]; then
    case $arg in
        -dbversion )  flags_args="${flags_args} -d" ;;
        -type )  flags_args="${flags_args} -t" ;;
        -host ) flags_args="${flags_args} -h" ;;
        * )       flags_args="${flags_args} $arg" ;;
    esac
fi
done
# push the args back on input stack
set -- ${flags_args}
print "New Parameters: $*"
 
# now use getops
while getopts :d:t:h: args; do
    case $args in
        d) typeset _VER="$OPTARG" ; [[ -z ${_VER} ]] && _VER=NONE ;;
        t) typeset _TYPE="$OPTARG" ; [[ -z ${_TYPE} ]] && _TYPE=NONE ;;
        h) typeset _HOST="$OPTARG" ; [[ -z ${_HOST} ]] && _HOST=NONE ;;
        *) usage ;;
    esac
done
shift $((OPTIND-1));
print "VER: $_VER"
print "TYPE: $_TYPE"
print "HOST: $_HOST"

Any help greatly appreciated.

Last edited by user052009; 06-22-2017 at 05:27 PM..

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LEARN ABOUT CENTOS

nsd-checkconf

nsd-checkconf(8)						    nsd 3.2.12							  nsd-checkconf(8)

NAME

       nsd-checkconf - NSD configuration file checker.

SYNOPSIS

       nsd-checkconf [-v] [-h] [-o option] [-z zonename] [-s keyname] configfile

DESCRIPTION

       nsd-checkconf  reads  a	configuration  file. It prints parse errors to standard error, and performs additional checks on the contents. The
       configfile format is described in nsd.conf(5).

       The utility of this program is to check a config file for errors before using it in nsd(8) or zonec(8). This program can also be  used  for
       shell scripts to access the nsd config file, using the -o and -z options.

OPTIONS

       -v     After  reading  print  the  options  to  standard output in configfile format. Without this option, only success or parse errors are
	      reported.

       -h     Print usage help information and exit.

       -o option
	      Return only this option from the config file. This option can to be used in conjunction with the -z option.  The special value zones
	      prints out a list of configured zones.

	      This  option  is primarily used by nsdc to parse the config file from the shell. If the -z option is given, but the -o option is not
	      given, nothing is printed.

       -s keyname
	      Prints the key secret (base64 blob) configured for this key in the config file. Used to help shell scripts parse the config file.

       -z zonename
	      Return the option specified with -o for zone 'zonename'.

	      If this option is not given, the server section of the config file is used.  This option is primarily used by nsdc to parse the con-
	      fig file from the shell.

	      The -o, -s and -z option print configfile options to standard output.

FILES

       /etc/nsd3/nsd.conf
	      default NSD configuration file

SEE ALSO

       nsd(8), nsdc(8), nsd.conf(5), nsd-notify(8), nsd-patch(8), nsd-xfer(8), zonec(8)

AUTHORS

       NSD was written by NLnet Labs and RIPE NCC joint team. Please see CREDITS file in the distribution for further details.

NLnet Labs							   jul 19, 2012 						  nsd-checkconf(8)

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