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 DEBIAN

svscanboot

svscanboot(8)						      System Manager's Manual						     svscanboot(8)

NAME

       svscanboot - starts svscan(8) in the /service directory, with output and error messages logged through readproctitle(8).

       svscanboot is available in daemontools 0.75 and above.

SYNOPSIS

       svscanboot

DESCRIPTION

       svscanboot runs the pipeline

       svscan /service 2>&1 | readproctitle service errors: .....

       with 400 dots. The last 400 bytes of error messages from svscan(8) will be visible to ps(1) through readproctitle(8).

       svscanboot sets $PATH to

	/command:/usr/local/bin:/usr/local/sbin:
	/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11R6/bin

       (all in one line, no space)

       and clears all other environment variables. Program writers are encouraged to use globally allocated names in /command.

SEE ALSO

       supervise(8),  svc(8),  svok(8),  svstat(8),  svscan(8),  readproctitle(8), fghack(8), pgrphack(8), multilog(8), tai64n(8), tai64nlocal(8),
       setuidgid(8), envuidgid(8), envdir(8), softlimit(8), setlock(8), ps(1)

	http://cr.yp.to/daemontools.html
	http://cr.yp.to/slashcommand.html

																     svscanboot(8)