lawrence@epps.kodak.com (Scott Lawrence) (01/03/91)
The perl man page says "Undef will pobably not do what you expect on ... dbm
array values".
What exactly _does_ it do?
Given
dbmopen( %Control, "dbmfilename", 0660 );
will
undef $Control{ "foo" };
remove the key (and associated value) "foo" from the file "dbmfilename"?
If not, is there a way to do so?
Please reply by mail - I will summarize to the net.
--
Scott Lawrence <lawrence@epps.kodak.com> <s.lawrence@ieee.org>
Atex Advanced Publishing Systems, Voice: 508-670-4023 Fax: 508-670-4033
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--
---
Scott Lawrence <lawrence@epps.kodak.com> <s.lawrence@ieee.org>
Atex Advanced Publishing Systems, Voice: 508-670-4023 Fax: 508-670-4033
Electronic Pre-Press Systems; 165 Lexington St. 400/165L; Billerica MA 01821merlyn@iwarp.intel.com (Randal L. Schwartz) (01/03/91)
In article <5073@atexnet.UUCP>, lawrence@epps (Scott Lawrence) writes: | | The perl man page says "Undef will pobably not do what you expect on ... dbm | array values". | | What exactly _does_ it do? | | Given | | dbmopen( %Control, "dbmfilename", 0660 ); | | will | | undef $Control{ "foo" }; | | remove the key (and associated value) "foo" from the file "dbmfilename"? I dunno. It might give the "undef" value to $Control{"foo"}. But I don't know how that would be stored on disk. | If not, is there a way to do so? delete $Control{"foo"} is the proper way. Removes "foo" from keys(%Control), and on disk too. ObJAPH: print "Just another Perl hacker," -- /=Randal L. Schwartz, Stonehenge Consulting Services (503)777-0095 ==========\ | on contract to Intel's iWarp project, Beaverton, Oregon, USA, Sol III | | merlyn@iwarp.intel.com ...!any-MX-mailer-like-uunet!iwarp.intel.com!merlyn | \=Cute Quote: "Intel: putting the 'backward' in 'backward compatible'..."====/
tchrist@convex.COM (Tom Christiansen) (01/03/91)
From the keyboard of lawrence@epps.kodak.com:
:The perl man page says "Undef will pobably not do what you expect on ... dbm
:array values".
:What exactly _does_ it do?
:Given
: dbmopen( %Control, "dbmfilename", 0660 );
:will
: undef $Control{ "foo" };
:remove the key (and associated value) "foo" from the file "dbmfilename"?
:If not, is there a way to do so?
:Please reply by mail - I will summarize to the net.
I tried to reply but the mail bounced. You want to use delete, not undef,
to get rid of it entirely. Otherwise you'll have a key whose value is
undef, as opposed to not having the key at all.
--tom
--
Tom Christiansen tchrist@convex.com convex!tchrist
"With a kernel dive, all things are possible, but it sure makes it hard
to look at yourself in the mirror the next morning." -me