Fix obsolete "local" variables (might be incompatible). Fix checking for 'sed' (was actually using expr, not sed).
Fix obsolete "local" variables (might be incompatible).
Fix checking for 'sed' (was actually using expr, not sed).

hashbang/hashbang.sh,hashbang/hashbang.sh,KellerFuchs/hashbang.sh,hashbang/hashbang.sh,KellerFuchs/hashbang.sh,hashbang/hashbang.sh,KellerFuchs/hashbang.sh