Tim Maher wrote:
> On Tue, Nov 14, 2006 at 02:37:12PM -0800, John W. Krahn wrote:
>>
>>> $x=getgrgid $gid;
>>> defined $x and $x =~ /[a-zA-Z]/ and $gid_name=$x;
>>Is there some Unix or Posix specification that requires the /[a-zA-
>>Z]/ test?
>>
>>Or to put it another way, if the test failed would that be proof
>>that the name was invalid?
>
> Not testing the filename there,
I never said "filename".
> but rather whether getgrgid
> returned a numeric GID (meaning it failed to find the associated user-
> name) or a verbal GID. Probably should be simply: $x =~ /\D/
$ perl -le'
for my $uid ( 1000 .. 1003 ) {
$name = getpwuid $uid;
print qq[$uid: "$name"] if defined $name
}
'
1000: "john"
1001: "june"
1002: "123"
$ perl -le'
for my $gid ( 1000 .. 1003 ) {
$name = getgrgid $gid;
print qq[$gid: "$name"] if defined $name
}
'
1001: "234"
If the value returned from getpwuid/getgrgid is undef then that UID/GID was
not in the file[1] but if it is defined then it is in the file[1] and it has
returned a valid name.
1) file being either /etc/passwd or /etc/group
John
--
Perl isn't a toolbox, but a small machine shop where you can special-order
certain sorts of tools at low cost and in short order. -- Larry Wall
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