nih

早期freebsd实现

eval "exec /usr/bin/perl -Spi.bak $0 $*"
	if $running_under_some_shell;

# $Header: nih,v 4.0 91/03/20 01:11:29 lwall Locked $

# This script makes #! scripts directly executable on machines that don't
# support #!.  It edits in place any scripts mentioned on the command line.

s|^#!(.*)|#!$1\neval "exec $1 -S \$0 \$*"\n\tif \$running_under_some_shell;|
	if $. == 1;