2. What am I supposed to know?

It is assumed that you:

If you feel that the above does not apply to you, let your instructor know now. Otherwise, you may want to start a separate shell window right away. In this window, you can then run plotdata and try different commands as we go along.

Briefly about the notation used in this document: this font is used to indicate a ``computer word'', i.e. a prompt or a message from a program, while something you need to type in shows up like this. In the latter case, a carriage return is implied at the end of every line of input.

One note of caution: Unix is fussy and distinguishes between lower and UPPER case letters, while plotdata often uses all capitals to name its special files. For example, PLOTDATA.JOURNAL is a log file of your session with a record of every plotdata command you typed in. If you want to examine or print that file, you need to refer to it in all uppercase, as in vi PLOTDATA.JOURNAL; trying to vi plotdata.journal will not work.

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