Commands

A command is one of the following:

pipeline [ ! word ... ] [ ; ]

A simple-command or pipeline can be optionally suffixed with the ! character, indicating that the debugger should open a pipe(2) and send the standard output of the last dcmd in the MDB pipeline to an external process created by executing $SHELL -c followed by the string formed by concatenating the words after the ! character. For more details, refer to "Shell Escapes".

expression pipeline [ ! word ... ] [ ; ]

A simple-command or pipeline can be prefixed with an expression. Before execution of the pipeline, the value of dot (the variable denoted by " . ") is set to the value of the expression.

expression , expression pipeline [ ! word ... ] [ ; ]

A simple-command or pipeline can be prefixed with two expressions. The first is evaluated to determine the new value of dot, and the second is evaluated to determine a repeat count for the first dcmd in the pipeline. This dcmd will be executed count times before the next dcmd in the pipeline is executed. The repeat count applies only to the first dcmd in the pipeline.

, expression pipeline [ ! word ... ] [ ; ]

If the initial expression is omitted, dot is not modified; however, the first dcmd in the pipeline will be repeated according to the value of the expression.

expression [ ! word ... ] [ ; ]

A command can consist only of an arithmetic expression. The expression is evaluated and the dot variable is set to its value, then the previous dcmd and arguments are executed using the new value of dot.

expression , expression [ ! word ... ] [ ; ]

A command can consist only of a dot expression and repeat count expression. After dot is set to the value of the first expression, the previous dcmd and arguments are repeatedly executed the number of times specified by the value of the second expression.

, expression [ ! word ... ] [ ; ]

If the initial expression is omitted, dot is not modified but the previous dcmd and arguments are repeatedly executed the number of times specified by the value of the count expression.

! word ... [ ; ]

If the command begins with the ! character, no dcmds are executed and the debugger executes $SHELL -c followed by the string formed by concatenating the words after the ! character.