kkew3 · December 19, 2018 21:56
diff --git a/_check_shebang_bash.sed b/_check_shebang_bash.sed
 /^ *$/d
 /^#[^!]/d
 1,/^#!\(\/bin\/\|\/usr\/bin\/env \)\(ba\)\?sh$/p
 /^#!\(\/bin\/\|\/usr\/bin\/env \)\(ba\)\?sh$/q
diff --git a/ensure_bash_shebang.sh b/ensure_bash_shebang.sh
 # returns none-zero when there's no shebang in file "$1"
 test -f "$1"
 # the `awk '{print $1}' is used to be compatible with BSD wc, which prepend a TAB character
 test "$$(sed -n -f _check_shebang_shell.sed "$1" | wc -l | awk '{print $1}')" = 1
 sed 'sed -n -f _check_shebang_shell.sed "$1" | tail -n1 | grep -q '^#!\(\/bin\/\|\/usr\/bin\/env \)\(ba\)\?sh$$'
	# returns none-zero when there's no shebang in file "$1"
	test -f "$1"
	# the `awk '{print $1}' is used to be compatible with BSD wc, which prepend a TAB character
	test "$$(sed -n -f _check_shebang_shell.sed "$1" \| wc -l \| awk '{print $1}')" = 1
	sed 'sed -n -f _check_shebang_shell.sed "$1" \| tail -n1 \| grep -q '^#!\(\/bin\/\\|\/usr\/bin\/env \)\(ba\)\?sh$$'