Hello, I am reviewing some perl code and ran across this line
$> = $<;
It's older code and I wish I could have been more descriptive in the title above (sorry folks). What does this line do?
`$>` is the effective user ID; `$<` is the real user id.
Matt Ball
2009-10-26 17:19:01
So all actions will be done with privilege of user who executed the script
Ivan Nevostruev
2009-10-26 17:19:58
Awesome! I knew you guys could help me through... Nikki
Nikki
2009-10-26 17:23:10
@Ivan Yes. It's effectively ignoring the setuid bit for whatever follows.
EmFi
2009-10-26 17:24:19
@Nikki reading the excellent documentation bundled with Perl also helps.
Sinan Ünür
2009-10-26 20:55:12
@Sinan: I haven't checked, but this has to be in the docs. They are very good, and make up for some of the odd features in the language (like variables with names that are single, non-intuitive, punctuation marks).
David Thornley
2009-10-27 19:24:06
+11
A:
Spig is correct. There are a whole whack of other global variables whose name is only a symbol. You might find it useful to check perldoc perlvar for a list of them and what they mean.
EmFi
2009-10-26 17:21:48