The DEBUG=$DEBUG ensures that DEBUG exists in the environment for the awk.
But it's pure overhead if it was already in the shell's environment.
You can achieve the same with an exported variable (exported = placed in the shell's environment)
Because DEBUG is in the shell's environment, all the run commands inherit it.
The use of ENVIRON[ ] in an awk script is interesting. Thanks for sharing!
It is not used often. Reason: when awk is run from the shell there is easy passing of variables.
The Posix style:
Or the (bit dirty) Unix awk style
Either invocation sets the DEBUG variable in awk, so there is no need for pulling it from ENVIRON[ ]
These 2 Users Gave Thanks to MadeInGermany For This Post:
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LEARN ABOUT SUSE
envsubst
ENVSUBST(1) GNU ENVSUBST(1)NAME
envsubst - substitutes environment variables in shell format strings
SYNOPSIS
envsubst [OPTION] [SHELL-FORMAT]
DESCRIPTION
Substitutes the values of environment variables.
Operation mode:
-v, --variables
output the variables occurring in SHELL-FORMAT
Informative output:
-h, --help
display this help and exit
-V, --version
output version information and exit
In normal operation mode, standard input is copied to standard output, with references to environment variables of the form $VARIABLE or
${VARIABLE} being replaced with the corresponding values. If a SHELL-FORMAT is given, only those environment variables that are referenced
in SHELL-FORMAT are substituted; otherwise all environment variables references occurring in standard input are substituted.
When --variables is used, standard input is ignored, and the output consists of the environment variables that are referenced in SHELL-FOR-
MAT, one per line.
AUTHOR
Written by Bruno Haible.
REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>.
COPYRIGHT
Copyright (C) 2003-2007 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for envsubst is maintained as a Texinfo manual. If the info and envsubst programs are properly installed at your
site, the command
info envsubst
should give you access to the complete manual.
GNU gettext-runtime 0.17 November 2007 ENVSUBST(1)