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Full Discussion: (probably stupidly simple) if [ $var1 = $var2 ] problem...
Top Forums Shell Programming and Scripting (probably stupidly simple) if [ $var1 = $var2 ] problem... Post 302206734 by woodgie on Wednesday 18th of June 2008 09:56:38 AM
Old 06-18-2008
(probably stupidly simple) if [ $var1 = $var2 ] problem...
OK, while I'm not new to the Mac or some of the the inner workings of Mac OS X I am quite new to scripting. And while I have "Learning the Bash Shell" by those lovely people at O'Reilly (Cameron Newham et. al.) I'm missing something, I just know I am.

Here's the problem:

At the beginning of my script I declare 2 variables:

Code:
#Uncomment the next line for log lines to be timestamped with the server's local time (BST, GMT, etc.)
timestamp=$(date)

#Uncomment the next line for log lines to be timestamped with UTC (Universal Coordinated Time)
#timestamp=$(date -u)

Then, later I want to log which type of timestamp is being used, so I tried every variation I could think of on:

Code:
if [ $timestamp=date ]
	then
		echo -e $timestamp "\tLogging using Server's Local Time" >> /path/to/logfile.log
	else
		if [ $timestamp=date -u ]
			then
				echo -e $timestamp "\tLogging using UTC" >> /path/to/logfile.log
			else
				echo -e $timestamp "\tI don't know what timestamp I'm logging with, but I'll carry on" >> /path/to/logfile.log
		fi
fi

My problem occurs at the [ $timestamp=date ] and [ $timestamp=date -u ] bits. It fails numerous ways and the best I've got is where it logs both "Logging using Server's Local Time" AND "Logging using UTC".

I've tried various combinations of:
Code:
[ $timestamp=date ] #btw, single brackets invariably end up in a 'too many arguments' complaint from the shell
[ $timestamp='date' ]
[[ $timestamp=$(date) ]]

etc...

I also tried this
Code:
fndate()
{
date
return $fndatevar
}

(and one for date -u)

and then using them like:
Code:
if [ $timestamp=$fndatevar ]

etc.

Still no joy

... I could go on. But at 03:00 this morning I decided to go to bed and ask. So here I am, asking.

Is it clear what I'm trying to do? Test which version of $timestamp the script is using an log the fact (even though it'll be obvious from the timestamps themselves which version is being used. It's more an exercise in what's possible and to learn how to do it than to do any rocket science).

Many thanks to those about to help me.
 

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LEARN ABOUT PHP

time_sleep_until

TIME_SLEEP_UNTIL(3)							 1						       TIME_SLEEP_UNTIL(3)

time_sleep_until - Make the script sleep until the specified time

SYNOPSIS

       bool time_sleep_until (float  $timestamp)

DESCRIPTION

	Makes the script sleep until the specified $timestamp.

PARAMETERS

	      o $timestamp
		- The timestamp when the script should wake.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  This  function is now available on Windows plat- |
       |	| forms.					    |
       |	|						    |
       +--------+---------------------------------------------------+
ERRORS
/EXCEPTIONS
	If the specified $timestamp is in the past, this function will generate a E_WARNING.

EXAMPLES

       Example #1

	      A time_sleep_until(3) example

	      <?php

	      //returns false and generates a warning
	      var_dump(time_sleep_until(time()-1));

	      // may only work on faster computers, will sleep up to 0.2 seconds
	      var_dump(time_sleep_until(microtime(true)+0.2));

	      ?>

NOTES

       Note

	       All signals will be delivered after the script wakes up.

SEE ALSO

       sleep(3), usleep(3), time_nanosleep(3), set_time_limit(3).

PHP Documentation Group 												       TIME_SLEEP_UNTIL(3)
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