I am looking to use long options in some of my code instead of single value
switches. I read the getopt shouldn't be used, instead getopts (with an 's')
which is built in to ksh93. Looking at the example in appendix B of a the
book _Learning the Korn Shell_, I made the following test case.
I see that I can't use two long options that start with the same letter (e.g.
--date and --delay), since both would be reduced to "-d" for getopts.
* Should I just give up on getopts and roll my own? (.e.g -d would not be
allowed, but --date and --delay would be)
* I do like how this makes a nice man page (e.g ./test.ksh --man). But is it
possible to have only long options without short options?
* Is there a way to make some of these options required and some optional,
without checking after getopts? i.e.,within the usage definitions. I see
where I can make an OPTARG optional (e.g. USAGE+="[r:read?reader
mode.]:?[reader]"
Thanks for any insight and assistance
Eric
============ start of test.ksh ============
#! /bin/ksh
#usage: test [options]
# -d, --date <date> delivery date (YYYYMMDD or YYYYMMDDHH)
# -f, --flag <flag> [ aaa | bbb ]
# --user retrieve data
# --media retrieve media
USAGE=$'[-?@(#)$Id: '$(basename $0 )$']'
USAGE+="[-author?Eric Peterson <email address>]"
USAGE+="[+NAME?$(basename $0 ) --- test command line arguments]"
USAGE+="[+DESCRIPTION?A test verify long options work "
USAGE+="on the command line.]"
USAGE+="[d:date?Delivery date (YYYYMMDD or YYYYMMDDHH)]:[date value]"
USAGE+="[f:flag?[ aaa | bbb ]]]:[type] "
USAGE+="[u:user?Retrieve user data]"
USAGE+="[m:media?Retrieve media content]"
dt_date=
fl_flag=
integer fl_user=0
integer fl_media=0
while getopts "${USAGE}" optchar
do
case ${optchar} in
d) dt_date=${OPTARG} ;;
f) fl_flag=${OPTARG} ;;
u) fl_user=1 ;;
m) fl_media=1 ;;
esac
done
if [[ -z ${dt_date} ]]
then
print -u2 '***> ERR: Missing date value'
$0 --long
exit 1
fi
if [[ ${fl_flag} != "aaa" ]] && [[ ${fl_flag} != "bbb" ]]
then
print -u2 '***> ERR: Invalid flag, expecting [ aaa | bbb ]'
$0 --long
exit 1
fi
if (( fl_user == 0 )) && (( fl_media == 0 ))
then
print -u2 '***> ERR: one or both retrieval flags must be on command line'
$0 --long
exit 1
fi
print "dt_date : [${dt_date}]"
print "fl_flag : [${fl_flag}]"
print "fl_user : [${fl_user}]"
print "fl_media : [${fl_media}]"
============ end of test.ksh ============
>./test.ksh --man
NAME
test.ksh --- test command line arguments
SYNOPSIS
./test.ksh [ options ]
DESCRIPTION
A test verify long options work on the command line.
OPTIONS
-d, --date=date value
Delivery date (YYYYMMDD or YYYYMMDDHH)
-f, --flag=type [ aaa | bbb ]
-u, --user Retrieve user data
-m, --media Retrieve media content
IMPLEMENTATION
version test.ksh
author Eric Peterson <email address>
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