shellcheck reported issue in this script: SC2155:warning:7:8: Declare and assign separately to avoid masking return values [shellcheck]

shellcheck reported issue in this script: SC2155:warning:4:8: Declare and assign separately to avoid masking return values [shellcheck]

shellcheck reported issue in this script: SC2155:warning:5:8: Declare and assign separately to avoid masking return values [shellcheck]

shellcheck reported issue in this script: SC2086:info:6:59: Double quote to prevent globbing and word splitting [shellcheck]

shellcheck reported issue in this script: SC2086:info:8:124: Double quote to prevent globbing and word splitting [shellcheck]

shellcheck reported issue in this script: SC2006:style:9:44: Use $(...) notation instead of legacy backticks `...` [shellcheck]