Tip: template for a safe and portable script Post: 303032522

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Top Forums Shell Programming and Scripting Tip: template for a safe and portable script Post 303032522 by MadeInGermany on Tuesday 19th of March 2019 02:47:02 PM

03-19-2019

Registered User

Tip: template for a safe and portable script

In an attempt to finally end this article I start this new thread.
Here is a template for a safe and portable script.

Code:

#!/bin/bash
# /bin/bash exists on most still supported Unixes
#
# tr and date behave better with
if [ -n "$LC_ALL" ]; then export LC_ALL=C; else export LANG=C; fi
#
# Unix optional packages install in
opt_path=/usr/local/bin
solaris_opt_path=/usr/sfw/bin:/opt/csw/bin
#
# set PATH so no PATH is inherited, export it to all children
# Solaris is Posix-compliant in /usr/xpg4/bin and BSD-compliant in /usr/ucb
export PATH=/usr/xpg4/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/ucb:${opt_path}:${solaris_opt_path}
#
# HP-UX is Posix-compliant with
export UNIX95=
#
# GREP_OPTIONS can obscure GNU grep
unset GREP_OPTIONS
#
# LD_* can obscure external commands
unset LD_LIBRARY_PATH LD_PRELOAD
#
# no glob file-matching in command args and word lists (for loop)
set -f
#
# prefer builtin commands and use Posix-compliant options
# check with "shellcheck"

Ok this is my wisdom. Perhaps you want to add something from your wisdom?

MadeInGermany

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LEARN ABOUT OPENSOLARIS

whereis

whereis(1B)					     SunOS/BSD Compatibility Package Commands					       whereis(1B)

NAME

       whereis - locate the binary, source, and manual page files for a command

SYNOPSIS

       /usr/ucb/whereis [-bmsu] [-BMS directory... -f] filename...

DESCRIPTION

       The  whereis utility locates source/binary and manuals sections for specified files. The supplied names are first stripped of leading path-
       name components and any (single) trailing extension of the form .ext, for example, .c. Prefixes of s. resulting from  use  of  source  code
       control are also dealt with. whereis then attempts to locate the desired program in a list of standard places:

	 etc
	 /sbin
	 /usr/bin
	 /usr/ccs/bin
	 /usr/ccs/lib
	 /usr/lang
	 /usr/lbin
	 /usr/lib
	 /usr/sbin
	 /usr/ucb
	 /usr/ucblib
	 /usr/ucbinclude
	 /usr/games
	 /usr/local
	 /usr/local/bin
	 /usr/new
	 /usr/old
	 /usr/hosts
	 /usr/include
	 /usr/etc

OPTIONS

       The following options are supported:

       -b    Searches only for binaries.

       -B    Changes or otherwise limits the places where whereis searches for binaries.

       -f    Terminates  the  last  directory list and signals the start of file names, and must be used when any of the -B, -M, or -S options are
	     used.

       -m    Searches only for manual sections.

       -M    Changes or otherwise limits the places where whereis searches for manual sections.

       -s    Searches only for sources.

       -S    Changes or otherwise limit the places where whereis searches for sources.

       -u    Searches for unusual entries. A file is said to be unusual if it does not have one entry of each requested type. Thus `whereis -m	-u
	     *' asks for those files in the current directory which have no documentation.

EXAMPLES

       Example 1 Finding files

       Find all files in /usr/bin which are not documented in /usr/share/man/man1 with source in /usr/src/cmd:

	 example% cd /usr/ucb
	 example% whereis -u -M /usr/share/man/man1 -S /usr/src/cmd -f *

FILES

	   o	  /usr/src/*

	   o	  /usr/{doc,man}/*

	   o	  /etc, /usr/{lib,bin,ucb,old,new,local}

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       chdir(2), attributes(5)

BUGS

       Since whereis uses chdir(2) to run faster, pathnames given with the -M, -S, or -B must be full; that is, they must begin with a `/'.

SunOS 5.11							    10 Jan 2000 						       whereis(1B)