perl中heredoc
在成块打印文本的时候特别有用。格式
print <<EOF
you text go here
EOF
sub usage{
print <<EOF;
Usage: test.pl -c config, -f file -l lines
-c config file
-f file name
-l number of lines
EOF
}
NOTE: the last EOF must start at the beginning of the line!!!
you can use other words instead of EOF
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