diff options
Diffstat (limited to 'editor/pnmflip')
-rwxr-xr-x | editor/pnmflip | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/editor/pnmflip b/editor/pnmflip index 44d95b45..07d4ddb9 100755 --- a/editor/pnmflip +++ b/editor/pnmflip @@ -1,5 +1,28 @@ -#!/usr/bin/perl -w +#!/bin/sh +############################################################################## +# This is essentially a Perl program. We exec the Perl interpreter specifying +# this same file as the Perl program and use the -x option to cause the Perl +# interpreter to skip down to the Perl code. The reason we do this instead of +# just making /usr/bin/perl the script interpreter (instead of /bin/sh) is +# that the user may have multiple Perl interpreters and the one he wants to +# use is properly located in the PATH. The user's choice of Perl interpreter +# may be crucial, such as when the user also has a PERL5LIB environment +# variable and it selects modules that work with only a certain main +# interpreter program. +# +# An alternative some people use is to have /usr/bin/env as the script +# interpreter. We don't do that because we think the existence and +# compatibility of /bin/sh is more reliable. +# +# Note that we aren't concerned about efficiency because the user who needs +# high efficiency can use directly the programs that this program invokes. +# +############################################################################## + +exec perl -w -x -S -- "$0" "$@" + +#!/usr/bin/perl #============================================================================ # This is a compatibility interface to Pamflip. # |