User guide

• if command_sequence

then command_sequence

[ elif command_sequence then command_sequence ]

[ else command_sequence ]

ﬁ

Conditional branching in if, while, and until loops is determined by the exit

status of the command sequence following the control structure. In general, an

exit status of zero indicates success and results in the execution of the true path.

In the following example, the eval command is used to extract an exit status

from variable junk. The variable is initialized with the console set command.

>>> set junk 0

>>> show junk

junk 0

>>> eval junk

>>> if (eval junk) then (echo true) else (echo false) fi

true

>>> set junk 1

>>> if (eval junk) then (echo true) else (echo false) fi

false

>>> set junk 2

>>> if (eval junk)

_> then (echo true)

_> else (echo false) fi

false

>>>

12.2 Getting Information About the System

The following commands are used to display information about software and

hardware resident in the system:

Command Description Example

show version Displays

version

number

of console

ﬁrmware

V1.1-0 Jul 1 1996 10:16:59

Console Primer 12–5