How can I check with the Perl independently from the operation system whether the specified local dial-up interface is up or down?
Perl: how to check dialup interface is up or down?
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Just use something like
$result1=
ifconfig -a; # (or ipconfig /all in windows),then perform a regexp match on the result to look for that particular interface name and its status (or the presence of an ip addresss).
In linux, the interface name should be ppp0 .
Test the ifconfig/ipconfig outputs first with that interface up/down/absent to make sure you take all cases into account.