📄 ch03l03.txt
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Listing 3.3 (a) A simple counter script; (b) HTML page that invokes the counter.(a) #!/usr/bin/perl print "Content-type: text/html\n\n"; open(COUNTER,"+< counter.txt"); flock(COUNTER,2); $count=<COUNTER>; seek(COUNTER,0,0); $count++; print "$count"; print COUNTER "$count"; flock(COUNTER,8); close(COUNTER);(b) <html> <h1>Welcome</h1> You are visitor #<b><!--#exec cgi="counter.cgi"--></b>. <p> </html>⌨️ 快捷键说明
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