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Shell Programming and Scripting
Script to adjust system time
Post 302499956 by xaiu on Friday 25th of February 2011 09:20:21 PM
02-25-2011
Script to adjust system time
Hello everyone,
I am trying to write a script that will accomplish the following:
- query current system time and store result into a variable
- wait for some amount of time, say 300 seconds
- reset system time to earlier queried time + 1 second
I did some basic shell scripting (CSH mainly) and took an intro to perl class in 2000 but have not touched either since, and as a result I really have no idea how to accomplish this task. I'm also not really sure how to do the math on the time since the systemsetup -settime requires hh:mm:ss, so at 59 seconds I'll run into a problem
I'm currently using OS X 10.6.6 and /bin says I have access to bash, csh, ksh, tcsh, and zsh. I have no preference for which shell the script runs in, although echo $SHELL says my current default is bash, if that makes any difference.
I would also like to use argv (or something similar) to define how many cycles I'd like to process to repeat and possibly to define the wait time as well instead of hard coding these into the script.
Thanks in advance!
Xaiu
I am trying to write a script that will accomplish the following:
- query current system time and store result into a variable
- wait for some amount of time, say 300 seconds
- reset system time to earlier queried time + 1 second
I did some basic shell scripting (CSH mainly) and took an intro to perl class in 2000 but have not touched either since, and as a result I really have no idea how to accomplish this task. I'm also not really sure how to do the math on the time since the systemsetup -settime requires hh:mm:ss, so at 59 seconds I'll run into a problem
I'm currently using OS X 10.6.6 and /bin says I have access to bash, csh, ksh, tcsh, and zsh. I have no preference for which shell the script runs in, although echo $SHELL says my current default is bash, if that makes any difference.
I would also like to use argv (or something similar) to define how many cycles I'd like to process to repeat and possibly to define the wait time as well instead of hard coding these into the script.
Thanks in advance!
Xaiu
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LEARN ABOUT PHP
set_time_limit
SET_TIME_LIMIT(3) 1 SET_TIME_LIMIT(3) set_time_limit - Limits the maximum execution time SYNOPSIS
bool set_time_limit (int $seconds) DESCRIPTION
Set the number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 sec- onds or, if it exists, the max_execution_time value defined in the php.ini. When called, set_time_limit(3) restarts the timeout counter from zero. In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out. PARAMETERS
o $seconds - The maximum execution time, in seconds. If set to zero, no time limit is imposed. RETURN VALUES
Returns TRUE on success, or FALSE on failure. NOTES
Warning This function has no effect when PHP is running in safe mode. There is no workaround other than turning off safe mode or changing the time limit in the php.ini. Note The set_time_limit(3) function and the configuration directive max_execution_time only affect the execution time of the script itself. Any time spent on activity that happens outside the execution of the script such as system calls using system(3), stream operations, database queries, etc. is not included when determining the maximum time that the script has been running. This is not true on Windows where the measured time is real. SEE ALSO
max_execution_time, max_input_time. PHP Documentation Group SET_TIME_LIMIT(3)