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Full Discussion: Date Format Problem
Top Forums Shell Programming and Scripting Date Format Problem Post 302973085 by Don Cragun on Friday 13th of May 2016 07:15:56 PM
Old 05-13-2016
When I tried you code, it failed with a syntax error due to the missing then on the last if statement.

After fixing that, I also thought it was strange that when the script was invoked with no operands, it responded with Success at last. (The inconsistent indentation in your code probably contributed to this oversight.)

And, there are a lot of calls to the external utilities expr and cut that can be handled much more efficiently and faster using shell built-ins available in bash, ksh93, and a few other shells (although some of them are extensions to the features required to appear in a POSIX-conforming shell).

Maybe something like the following would also work for you:
Code:
#!/usr/bin/bash
#set -xv
IAm=${0##*/}
months="JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC"

dateconv='
	    #[0-9][0-9]-[ADFJMNOS][ACEOPU][BCGLNPRTVY]-[0-9][0-9][0-9][0-9] ]]
	if [[ "$in" != \
	    [0-9][0-9]-[[:upper:]][[:upper:]][[:upper:]]-[0-9][0-9][0-9][0-9] ]]
	then	printf "%s: Bad %s date format: \"%s\"\n" "$IAm" "$s_e" \
		    "$in" >&2
		usage 2
	fi
	day=${in%%-*}
	day=${day#0}
	abb_month=${in:3:3}
	year=${in##*-}
	year=${year#0}
	year=${year#0}
	year=${year#0}
	month=0
	echo "$day $abb_month $year"
		for((i = 0; i < 36; i += 3))
	do	if [ "${months:$i:3}" = "$abb_month" ]
		then	month=$(((i + 3) / 3))
			break
		fi
	done
	if [ $month  -eq 0 ]
	then	printf "%s: Invalid abbreviated %s month: \"%s\"\n" "$IAm" \
		    "$s_e" "$abb_month" >&2
		usage 3
	fi
	dt=$(($year * 10000 + $month * 100 + $day))
'

usage() {
	printf 'Usage: %s start_date end_date\n\t%s\n\t%s\n' "$IAm" \
	    'start_date & end_date format: DD-MMM-YYYY' \
	    '(where MMM is a 3 uppercase-letter abbreviation for the month)' >&2
	exit ${1:-1}
}
	
if [ $# -ne 2 ]
then	printf '%s: Incorrect number of operands (%d found, 2 required).\n' \
	    "$IAm" $# >&2
	usage
fi
in=$1
s_e=start
eval "$dateconv"
start_date=$dt
echo $start_date

in=$2
s_e=end
eval "$dateconv"
end_date=$dt
echo $end_date

if [ $start_date -le $end_date ]
then	echo "Success at last"
else 	printf '%s: start date "%s" is greater than end date "%s"\n' "$IAm" \
	    "$1" "$2"
	exit 4
fi

(Note that this uses /usr/bin/bash as it appeared in your code. On my system, there is a /bin/bash but not a /usr/bin/bash.)
 

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LEARN ABOUT SUNOS

dp

DP(8)                                                                [nmh-1.5]                                                               DP(8)

NAME

       dp - parse dates 822-style

SYNOPSIS

       /usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...

DESCRIPTION

       Dp  is  a  program that parses dates according to the ARPA Internet standard.  It also understands many non-standard formats, such as those
       produced by TOPS-20 sites and some UNIX sites using ctime(3).  It is useful for seeing how nmh will interpret a date.

       The dp program treats each argument as a single date, and prints the date out in the official 822-format.  Hence, it  is  usually  best  to
       enclose each argument in quotes for the shell.

       To  override  the  output  format  used by dp, the -format string or -format file switches are used.  This permits individual fields of the
       address to be extracted with ease.  The string is simply a format string and the file is simply a format file.  See  mh-format(5)  for  the
       details.

       Here is the default format string used by dp:

            %<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>

       which  says  that  if an error was detected, print the error, a `:', and the date in error.  Otherwise, output the 822-proper format of the
       date.

FILES

       $HOME/.mh_profile          The user profile

PROFILE COMPONENTS

       None

SEE ALSO

       ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)

DEFAULTS

       `-format' default as described above
       `-width' default to the width of the terminal

CONTEXT

       None

BUGS

       The argument to the -format switch must be interpreted as a single token by the shell that invokes dp.  Therefore, one must  usually  place
       the argument to this switch inside quotes.

MH.6.8                                                             11 June 2012                                                              DP(8)
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