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nilreml/defensive bashisms

Last active March 22, 2024 14:44
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defensive bashisms
check for bash version 4+ (POSIX-compliant) :
[ -z "${BASH_VERSINFO}" ] || [ -z "${BASH_VERSINFO[0]}" ] || [ ${BASH_VERSINFO[0]} -lt 4 ]
path to script even if symlinked:
SCRIPT_DIR="$( cd -P "$( dirname "$(readlink -f "${BASH_SOURCE[0]}")" )" >/dev/null 2>&1 && pwd )"
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