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Full Discussion: Uppercase variable
Top Forums Shell Programming and Scripting Uppercase variable Post 303033959 by wisecracker on Monday 15th of April 2019 10:18:24 AM
Old 04-15-2019
Hi all...

Bizarrely, I have switched from lowercase to uppercase for variables as they are easier to see straight away. The vast majority of tools/commands/utilities are lowercase and can _mingle_ with the variables visually whereas uppercase tend to stand out. I do pick names that are very literal and unlikely to coincide with those of the/any environment.

Examples: VERTICAL_GAIN and AUDIO_SAMPLE ...

On AudioScope I was _briefed_ about using back-ticks but they have long since gone, along with this, which is still valid on OSX 10.14.3's bash version, 3.2.57:
x=1; x=$[ ( x + 4 ) ]; echo "$x"<CR> ...
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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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