Lantronix SLC16, Руководство пользователя

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8: Device Ports
SLC™ Console Manager User Guide 128
Control Flow Commands
The
control flow
commands allow conditional execution of blocks of other commands. The
preprocessor treats these as Primary commands, allowing them to appear anywhere in a script
that a Primary command is appropriate.
Table 8-17 Control Flow Commands
expr
This command evaluates an arithmetic expression and returns the result. The
expr
command will only be used in combination with the
set
command to generate a
value for a variable. Syntax:
expr <value> <operation> <value>
Each <value> will be either a word or a variable reference, and <operation> an
arithmetic operation.
timestamp
This command returns the current time of day as determined by the SLC console
manager. The
timestamp
command will only be used in combination with the
set
command to produce the value for a variable. Syntax:
timestamp <format>
where
<format>
is a quoted string.
format The format command is analogous to the C language sprintf(). The format
command will only be used in combination with the set command to produce the
value for a variable. Syntax:
format <format string> <value 1> <value 2> ... <value n>
where <format string> will be a quoted string. Each of the <value x> elements will be
a word, a quoted string or a variable reference.
Command Description
while
The
while
command executes an associated block of commands as long as its
Boolean expression evaluates to TRUE. After each iteration the Boolean expression
is re-evaluated; when the Boolean expression evaluates to FALSE execution
passes to the first command following the associated block. Each command within
the block must be a Primary command. Syntax:
while {<Boolean expression>} {
command 1
command 2
...
command n
}
Command Description