Portable Shell Script - Determine Which Version of Binary is Installed? Post: 302710789

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Top Forums Shell Programming and Scripting Portable Shell Script - Determine Which Version of Binary is Installed? Post 302710789 by colinjohnson on Friday 5th of October 2012 01:00:49 AM

10-05-2012

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Portable Shell Script - Determine Which Version of Binary is Installed?

I currently have a shell script that utilizes the "Date" binary - this application is slightly different on OS X (BSD General Commmand) and Linux systems (gnu date). In particular, the version on OS X requires the following to get a date 14 days in the future "date -v+14d -u +%Y-%m-%d" where gnu date requires "date -d "+ 14 days" -u +%Y-%m-%d".

I desire to make my script portable - so I believe that I'll need to utilize a test to determine which version of the date application is installed and thus, what command to run. I've come up with the following two methods, but am looking for advice:

Use "File" tool:

Code:

date_binary_full_path=`which date`
date_binary=`file -b $date_binary_full_path`
if [[ $date_binary ~= "Mach-O 64-bit executable x86_64" ]]
    then date_command="date -v+14d -u +%Y-%m-%d"
elif  [[ $date_binary == "ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped" ]]
	date_command="date -d \"+ 14 days\" -u +%Y-%m-%d"
else
	date_command="date -d \"+ 14 days\" -u +%Y-%m-%d"
fi
echo $date_command

Use "date" --version switches:

Code:

if [[ `date --version 2>&1 | grep -c "date (GNU coreutils)"` > 1 ]]
	then date_command="date -d \"+ 14 days\" -u +%Y-%m-%d"
else
	$="date -v+14d -u +%Y-%m-%d"
fi
echo $date_command

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LEARN ABOUT SUSE

tcal

TCAL(1) 						      General Commands Manual							   TCAL(1)

NAME

       Tcal - runs the Gcal program with the date of tomorrow's day.

SYNOPSIS

       tcal [--help | --version] | [--shift=[+|-]number] [Argument...]

DESCRIPTION

       Tcal  is  a program which runs gcal with a date set one day ahead (equivalent the --shift=1 option). All given arguments are passed unmodi-
       fied to the Gcal program. If the Gcal program shall be called with another date than tomorrow's date, this desired date can be selected	by
       using  the --shift=[+|-]number option, in which [+|-]number is the distance of days the desired date is distant from the actual date (works
       only for Gregorian years). The --shift option must be given before all other arguments which are passed to the Gcal program. An exit status
       of 0 means all processing is successfully done, any other value means an error has occured.

OPTIONS

       --help Print a usage message listing all available options, then exit successfully.

       --version
	      Print the version number, then exit successfully.

       --shift=[+|-]number
	      Define the displacement in [+|-]number days the desired date is distant from the actual date.

ENVIRONMENT

       GCALPROG
	      The  GCALPROG  environment  variable contains the file name of the executable Gcal program, which is used by Tcal to call Gcal. This
	      takes precedence over the file name `gcal', which is burned-in during the compilation step of tcal.

COPYRIGHT

Tcal Copyright (c) 1995, 96, 1997, 2000 Thomas Esken

       This software doesn't claim completeness, correctness or usability.  On principle I will not be liable for any damages or losses  (implicit
       or  explicit),  which  result from using or handling my software.  If you use this software, you agree without any exception to this agree-
       ment, which binds you LEGALLY !!

       Tcal is free software and distributed under the terms of the `GNU General Public License'; published by	the  `Free  Software  Foundation';
       version 2 or (at your option) any later version.

       Any suggestions, improvements, extensions, bug reports, donations, proposals for contract work, and so forth are welcome!  If you like this
       tool, I'd appreciate a postcard from you!

       Enjoy it   =8^)

AUTHOR

  ------------------------oOO	   \\_''/	OOo---------------------------
  Thomas Esken		     O	   (/o-o)     O  eMail: esken@gmx.net
  Im Hagenfeld 84		  ((  ^  ))	  Phone: +49 251 232585
  D-48147 Muenster; Germany    \____) ~ (____/	  MotD : 2old2live, 2young2die

SEE ALSO

       gcal(1), txt2gcal(1), gcal2txt(1).

								   June 14, 2000							   TCAL(1)