Jeff Newmiller wrote:
>
> On Tue, 11 Dec 2001, David Douthitt wrote:
>
> [...]
>
> > grep -v '^'$PKGNAME'$' $PKGD/pkg.old > $PKGD/packages
>
> why the rigamarole with the single quotes?
>
> grep -v "^$PKGNAME$" $PKGD/pkg.old > $PKGD/packages
I was playing chicken :)
The first breaks down this way:
string (not scanned by shell): '^'
variable: $PKGNAME
string (not scanned by shell): '$'
The second is a little more dicey - how does one know that the shell
won't get confused or upset by the final '$'? With the double-quotes,
the shell scans the string. Given your example, I think I'd prefer
using:
"^${PKGNAME}$"
because it forces the name upon the shell - prevents even more
confusion...
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