ILOG CPLEX accepts commands in several different formats. You can type either the full command name, or any shortened version that uniquely identifies that name. For example, enter help after the CPLEX> prompt, as shown:

You will see a list of the ILOG CPLEX commands on the screen.

Since all commands start with a unique letter, you could also enter just the single letter h.

ILOG CPLEX does not distinguish between upper- and lower-case letters, so you could enter h, H, help, or HELP. All of these variations invoke the help command. The same rules apply to all ILOG CPLEX commands. You need only type enough letters of the command to distinguish it from all other commands, and it does not matter whether you type upper- or lower-case letters. This manual uses lower-case letters.

After you type the help command, a list of available commands with their descriptions appears on the screen, like this:

add        add constraints to problem
baropt     solve using barrier algorithm
change     change the problem
display    display problem, solution, or parameter settings
enter      enter a new problem
help       provide information on CPLEX commands
mipopt     solve a mixed integer program
netopt     solve the problem using network method
optimize   solve the problem
primopt    solve using the primal method
quit       leave CPLEX
read       read problem or basis information from a file
set        set parameters
tranopt    solve using the dual method
write      write problem or solution info. to a file
xecute     execute a command from the operating system

Enter enough characters to uniquely identify commands & options.
Commands can be entered partially (CPLEX will prompt you for 
further information) or as a whole.

To find out more about a specific command, type help followed by the name of that command. For example, to learn more about the primopt command type:

Typing the full name is unnecessary. Alternatively, you can try:

The following message appears to tell you more about the use and syntax of the primopt command:

The PRIMOPT command solves the current problem using
a primal simplex method or crosses over to a basic solution 
if a barrier solution exists.

Syntax:  PRIMOPT

A problem must exist in memory (from using either the
ENTER or READ command) in order to use the PRIMOPT
command.

Sensitivity information (dual price and reduced-cost
information) as well as other detailed information about
the solution can be viewed using the DISPLAY command,
after a solution is generated.

Summary

The syntax for the help command is: