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Write a message to the trace file, if tracing is enabled. If tracing is not enabled, trace output is not generated. The trace message can be an XPath expression or string, or it can be generated by the contents of a trace statement block.

Enabling of tracing is typically a feature of the environment in which a SLAX script is called. When executing a script using the slaxproc command, include the --trace or -t option to enable tracing. For more information about slaxproc, see Understanding the SLAX Processor (slaxproc).


trace expression

XPath expression or string written to the trace file.

SLAX Example

The following examples demonstrate the trace statement syntax. The first example writes a concatenated string to the trace file. The second example uses a code block to output a <max> element and a <min> element and the values of the max and min variables. The third example uses a conditional statement to specify when to output trace data. If the expression evaluates to true, the code block writes the string and the <options> element hierarchy to the trace file.

Release Information

Statement introduced in version 1.1 of the SLAX language, which is supported in Junos OS Release 12.2 and later releases.