Re: [bug-grep] egrep and fgrep script assume path

[Stepan Kasal]

Hi Paul,

On Wed, Jan 26, 2005 at 11:07:41AM -0500, Paul Jarc wrote:
> Stepan Kasal <address@hidden> wrote:
> >   */*) dir=${0%/*}/ ;;
> 
> Solaris /bin/sh doesn't handle advanced expansions like that.  I'd
> suggest:

your solution requires one more process, and ${..%..} is required by
POSIX.
Autoconf manual warns that not all hosts have dirname, even though it
doesn't mention any OS.  This claim could be still true.

What does Solaris do with  ${0%/*} ?  I hope it expands to an empty string.

So I propose something like

#!/bin/sh
case $0 in
  */*) dir=${0%/*}/
        case $dir in
        / ) dir=`dirname "$0" 2>/dev/null`
            test "x$dir" != x && dir=$dir/
            ;;
        esac
  *) dir="" ;;
esac
exec "${dir}"grep -E ${1+"$@"}

Would you be so kind to debug this script on Solaris?

And I don't think we need to care about the special case when the script
is installed at the root.  Double slash shouldn't hurt.

With kind regards,
        Stepan