Since I’m seldom in control of all the devices between myself and whatever system I am trying to reach, I often like to verify whether I will be able to connect to a particular port on the particular ...

A lot of information is available about individual files on a Unix system. For example, the ls -l command will display the permissions matrix and ls -i will display a file’s inode. But, if we want to ...

I write Perl programs that use the Windows shell command dir. The dir command is built into cmd.exe and there is no dir.exe in the System folder. My colleagues use my Perl programs and some of them ...