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Full Discussion: Add command line argument
Top Forums Shell Programming and Scripting Add command line argument Post 303022256 by Don Cragun on Wednesday 29th of August 2018 12:33:53 AM
Old 08-29-2018
You might want to try something like:
Code:
case $# in
(0)	echo 'No time value given for sleep.'
	exit 1;;
(1)	time=$1
	note="Timer is counting down to $time."
	break;;
(*)	time=$1
	shift
	note=$*;;
esac
echo "time is $time"
echo "note is $note"

If you don't see what it is doing try invoking your script with:
Code:
bash -xv scriptname
bash -xv scriptname 15
bash -xv scriptname 30 Note is one or more command line operands.

 

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LEARN ABOUT REDHAT

alarm

ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME

       alarm - set an alarm clock for delivery of a signal

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);

DESCRIPTION

       alarm arranges for a SIGALRM signal to be delivered to the process in seconds seconds.

       If seconds is zero, no new alarm is scheduled.

       In any event any previously set alarm is cancelled.

RETURN VALUE

       alarm  returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no previ-
       ously scheduled alarm.

NOTES

       alarm and setitimer share the same timer; calls to one will interfere with use of the other.

       sleep() may be implemented using SIGALRM; mixing calls to alarm() and sleep() is a bad idea.

       Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.

CONFORMING TO

       SVr4, SVID, POSIX, X/OPEN, BSD 4.3

SEE ALSO

       setitimer(2), signal(2), sigaction(2), gettimeofday(2), select(2), pause(2), sleep(3)

Linux								    1993-07-21								  ALARM(2)
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