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Top Forums Shell Programming and Scripting Validate long date format in If statement Post 302272575 by Batsies on Wednesday 31st of December 2008 02:38:10 AM
Old 12-31-2008
Validate long date format in If statement

Hi,

I want to validate if the given input is a valid month (written in long month format)

Jan / Feb / Mar / Apr / May / Jun etc etc

This is what I've got with || (or statements):

Code:
 
#!/usr/bin/ksh
INPUT_DATE=$1
FORMATTED_DATE=`date | cut -f2 -d' '`
#If there's no input use the sysdate otherwise use the input
if [[ -z "$INPUT_DATE" ]] ; then
   MONTH_TO_PROCESS=$FORMATTED_DATE
else
   MONTH_TO_PROCESS=$1
fi
echo $MONTH_TO_PROCESS
 
if [[ "$MONTH_TO_PROCESS" = "Feb" || "$MONTH_TO_PROCESS" = "Jan" || "$MONTH_TO_PROCESS" = "Mar"]]; then
   echo "$MONTH_TO_PROCESS is Valid"
else
   echo "$MONTH_TO_PROCESS is Invalid"
fi

But when I use this for every month (jan - dec), the list is too long and I get an error.

This is what I want (but this is too long), how can i validate the month or cut all the or statements over multiple lines, I tried // but that doesn't work:

Code:
if [[ "$MONTH_TO_PROCESS" = "Feb" || "$MONTH_TO_PROCESS" = "Jan" || "$MONTH_TO_PROCESS" = "Mar" || "$MONTH_TO_PROCESS" = "Apr" || "$MONTH_TO_PROCESS" = "May" || "$MONTH_TO_PROCESS" = "Jun" || "$MONTH_TO_PROCESS" = "Jul" || "$MONTH_TO_PROCESS" = "Aug" || "$MONTH_TO_PROCESS" = "Sep" || "$MONTH_TO_PROCESS" = "Oct" || "$MONTH_TO_PROCESS" = "Nov" || "$MONTH_TO_PROCESS" = "Dec"]]; then

 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
All times are GMT -4. The time now is 02:11 PM.
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