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Full Discussion: Function into a condition ?
Top Forums Shell Programming and Scripting Function into a condition ? Post 302782717 by Corona688 on Tuesday 19th of March 2013 11:15:40 AM
Old 03-19-2013
${DATE:0:1} that's a substring operator -- the variable, the offset, and the length. An offset of 0 and length of 1 gets the first character.

To only process valid lines:
Code:
valid () { 
...
}

process() {
...
}

while read DATE HH MM
do
        [ "${DATE:0:1}" = "#" ] && continue # Ignore comments
        [ -z "$DATE" ] && continue # Ignore blank lines
        if ! valid $DATE $HH $MM # Ignore invalid lines
        then
                echo "$DATE $HH $MM is invalid"
                continue
        fi

        process $DATE $HH $MM
done < inputfile

This User Gave Thanks to Corona688 For This Post:
 

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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 02:16 AM.
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