利用Perl检测系统中与系统用户相关的进程
# cat check.pl#!/bin/perl
unless($#ARGV == 0){die "Usage: $0 : $!";}
open(PASSWD,"/etc/passwd")or die "cant open:$!";
$username=shift(@ARGV);
print "$username.\n";（---改行可以不要，当时是为了测试用的！）
while($pwline=){
if($pwline =~/$username:/){print "$username is a system user here\n";last;}
else {die "$username is not a system user here\n";}
}
close PASSWD;
open(LOGGEDON,"who|")or die "cant open:$!";
while($logged=){
if($logged =~ /$username/){$logged_on=1;last;}
}
close LOGGEDON;
die "$username is not logged on.\n" if !$logged_on;
print "$username is logged on and running these processed.\n";
open(PROC,"ps aux|") or die "cant open: $!";
while($line=){
print "$line" if("$line" =~/^$username/);
}
close PROC;
print "*"x 10,"\n";
print "so long.\n";
#
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