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Full Discussion: Code optimization
Top Forums Shell Programming and Scripting Code optimization Post 303018763 by MadeInGermany on Thursday 14th of June 2018 12:44:59 PM
Old 06-14-2018
Simply break the loop if ORACLE_SID got a value!
(You do not need to check the boundaries. Imagine you have 10+ items...)
Code:
#!/bin/bash
R=$'\e[0;31m'
N=$'\e[0m'

OPTIONS=(
 db_a db_b db_c db_g
 db_o db_e db_k db_t
)
PS3=$'\n'"${R}Choose database ${N}"

select ORACLE_SID in "${OPTIONS[@]}"
do
  [[ -n $ORACLE_SID ]] && break
  printf "${R}Invalid number!${N}\n"
done

#^D pressed?
[[ -n $ORACLE_SID ]] || exit

export ORACLE_SID HOST=${ORACLE_SID}_qa
echo "HOST=$HOST"

These 2 Users Gave Thanks to MadeInGermany For This Post:
primo102 Scrutinizer
 

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LEARN ABOUT CENTOS

virt-host-validate

VIRT-HOST-VALIDATE(1)					      Virtualization Support					     VIRT-HOST-VALIDATE(1)

NAME

	 virt-host-validate - validate host virtualization setup

SYNOPSIS

	 virt-host-validate [OPTIONS...] [HV-TYPE]

DESCRIPTION

       This tool validates that the host is configured in a suitable way to run libvirt hypervisor drivers. If invoked without any arguments it
       will check support for all hypervisor drivers it is aware of. Optionally it can be given a particular hypervisor type ('qemu' or 'lxc') to
       restrict the checks to those relevant for that virtualization technology

OPTIONS

       "-v", "--version"
	   Display the command version

       "-h", "--help"
	   Display the command line help

       "-q", "--quiet"
	   Don't display details of individual checks being performed.	Only display output if a check does not pass.

EXIT STATUS

       Upon successful validation, an exit status of 0 will be set. Upon failure a non-zero status will be set.

AUTHOR

       Daniel P. Berrange

BUGS

       Report any bugs discovered to the libvirt community via the mailing list "http://libvirt.org/contact.html" or bug tracker
       "http://libvirt.org/bugs.html".	Alternatively report bugs to your software distributor / vendor.

COPYRIGHT

       Copyright (C) 2012 by Red Hat, Inc.

LICENSE

       virt-host-validate is distributed under the terms of the GNU GPL v2+.  This is free software; see the source for copying conditions. There
       is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE

SEE ALSO

       virsh(1), "virt-pki-validate", "virt-xml-validate"

libvirt-1.1.1							    2012-09-21						     VIRT-HOST-VALIDATE(1)
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