support script to convert /bin/bash to /usr/bin/env

examples/bash2env.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+# file: bash2env.sh
+# simole helper script to convert bash shebang from
+# ! /bin/bash TO ! /usr/bin/env bash
+
+# This file is public domain in the USA and all free countries.
+# Elsewhere, consider it to be WTFPLv2. (wtfpl.net/txt/copying)
+
+#### $$VERSION$$ v0.94-3-g96fda44
+
+# adjust your language setting here
+# https://github.com/topkecleon/telegram-bot-bash#setting-up-your-environment
+export 'LC_ALL=C.UTF-8'
+export 'LANG=C.UTF-8'
+export 'LANGUAGE=C.UTF-8'
+
+unset IFS
+
+################
+# uncomment thenfollowing line to make the conversion
+# DOIT="yes"
+
+if [ "$1" = "" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
+	echo "$0: convert bash shebang to /usr/bin/env bash"
+	echo "usage: $0 script [script ...]"
+	exit
+fi
+
+# loop tomprocess files
+if [ "${DOIT}" = "yes" ]; then
+	echo "Warning, changes will be done!"
+else
+	echo "Dry run, output changes only!"
+	echo "Uncomment DOIT=\"yes\" in script to make the changes permanent."
+
+fi
+
+echo "Press enter  to continue ..."
+#shellcheck disable=SC2034
+read -r CONTINUE
+
+
+for file in "$@"
+do
+	file "${file}"
+	if [[ "$(file -b "${file}")" =~  Bourne.*script.*text ]]; then
+	    echo "Processing ${file} ..."
+	    if head -n 1 "${file}" | grep -q '^#!/bin/bash'; then
+		if [ "${DOIT}" = "yes" ]; then
+		    sed -i -e '1 s|^#!/bin/bash|#!/usr/bin/env bash|' "${file}"
+		    head -n 1 "${file}"
+		else
+		    sed -n -e '1 s|^#!/bin/bash|#!/usr/bin/env bash (dry run)|p' "${file}"
+		fi
+	    else
+		echo "No #!/bin/bash shebang, nothing to convert."
+	    fi
+	    echo -e "... done.\n"
+	else
+		echo -e "Not a bash script, skipping ${file} ...\n"
+	fi
+done