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Top Forums Shell Programming and Scripting How to do simple date (time) calculation in shell script? Post 302854061 by nbsparks on Monday 16th of September 2013 05:08:53 PM
Old 09-16-2013
How to do simple date (time) calculation in shell script?

Hi,

I'm looking for a way to do a simple math calc during a shell script as a means of logging how long a particular task takes.

For example...
Code:
STARTTIME=whenever this script starts
./path/to/command.sh >>logfile.log
TOTALTIME=<time at this stage of the script after above command finished> - $STARTTIME
ECHO This command took $TOTALTIME to complete. >>logfile.log

I know that's a crude representation, but hopefully enough to communicate what I'm looking to accomplish.

Thank you!!
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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