The value of this parameter is expanded (see PROMPTING below) and displayed by interactive shells after reading a command and before the command is executed.
Cons: must run commands in a subshell, therefore unable to set variables. Must write in a file and then retrieve contents after execution.
Pros: not subject to debug printing.
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Cons: must run commands in a subshell, therefore unable to set variables. Must write in a file and then retrieve contents after execution.
Pros: not subject to debug printing.
Boost priority