EECS 1012 Lecture Notes - Lecture 28: Operand
EECS 1012 Lecture 28 Notes
Introduction
Listing data
• The name of a particular file to be used with the command, a particular format for
listing data, or a detail about how the command is to be performed.
• Many times, some or all of the operands are optional
• This simply means that a default condition is to be used if the operand is not specified.
• In some circumstances, the command itself may be preceded by a logical path name
that specifies the particular device or file location where the command is to be found.
• However, most operating systems maintain an internal list where most commands can
be found.
• This list is often referred to as path variable.
• As an example, the Linux command ls -lF path part a/path part b consists of the
command ls and the two operands -lF and path part a/path part b.
• This command requests a directory listing from the subdirectory with path name path
part a/ path part b.
• Without the optional operand path part a/path part b, the command lists the current
directory (or file folder, if you prefer), wherever that happens to be.
• An additional operand might redirect the output to a file or printer, for example, instead
of to the screen.
• The Linux command to store the directory list in put file a (presumably for later printing)
would look like this:
• ls -lF path part a/path part b >put file a
• The equivalent command at a Windows command prompt would look like this: DIR
PATHPARTA\PATHPARTB>PUTFILEA
• In each of these cases, many other optional operands are possible
• These operands would be used to modify the facts listed and the format of the directory
listing.
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