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Full Discussion: binaries PATH check in a ksh script
Top Forums Shell Programming and Scripting binaries PATH check in a ksh script Post 302526390 by asanchez on Tuesday 31st of May 2011 11:08:13 AM
Old 05-31-2011
binaries PATH check in a ksh script
The situation is a data center with around 800 servers.
Each server has installed one of these unix-like OS: rhel, sunos, aix, hp-ux.

And we have to make scripts general enough to being able to be executed over all these servers.

Furthermore, sometimes the scripts will be executed as a normal user and sometimes they will be executed as root.

The problem is:

sometimes the path for the binaries used into the script are in one place, and sometimes they are in another place. So the variety of different places the binaries used into the script are placed is big.

So, to make the scripts "bomb-proof" we're using this strategy:

First line of each script is containing a:

Code:
PATH=$PATH:/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin:/var/tmp:/etc:/home/ouruser:/export/home/ouruser...

In general, we're assigning to the PATH variable the content it had ($PATH) plus the content of all the PATH variables of the user root of each type of OS plus some "usually known places for rare binaries temporary used like inqraid in /var/tmp or in /home/ouruser" on some servers.

After doing this PATH assignment, we're checking for each command used in the script if it is in the path, checking it with the
Code:
which

command. If one of the binaries used in the script is not in our "MEGAPATH" we exit with a message saying the binary X needed to executed the script is not in the PATH.

My question is:

Is this the better way to ensure the different binaries we should use in a script are in the PATH before continuing with the execution of the script? I'm open to different suggestions. Thank you!
 

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LEARN ABOUT DEBIAN

surfraw-update-path

SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME

       surfraw-update-path - updates PATH in shell config files

SYNOPSIS

       surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL]

DESCRIPTION

       surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file.

       Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es

       Don't forget to login again or source your login files for it to take effect.

OPTIONS

       -check
	   Checks to see if the surfraw config code is present.  This is the default.

       -add
	   Adds the surfraw config code.

       -remove
	   Removes the surfraw config code

       -sys
	   Updates the system-wide shell config instead of the user.  Must be done as root.

       -shell=SHELL
	   Selects the shell to configure. Defaults to the value of the $SHELL environment variable.

	   Currently supported shells are:

	   sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es.

       -all
	   Attempts to configure the startup files for all known shells

       -help
	   Gives a usage message

RETURN VALUE

       -check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error.

       All other options return 0 on success, or 2 on error.

ENVIRONMENT

       SHELL
	   Used to determine which shell to configure, if -shell is not given.

       HOME
	   Used to find users config files.

       ENV Used by posix-compliant shells to specify a startup rc file.

       ZDOTDIR
	   Used to find user config files for zsh. If not set, defaults to HOME.

SEE ALSO

       surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1)

AUTHOR

       Ian Beckwith <ianb@erislabs.net>

perl v5.12.4							    2011-07-12						    SURFRAW-UPDATE-PATH(1)
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