پاسخ : set echo

verbose
    If set, causes the words of each command to be printed, after history substitution (if any). Set by the -v command line option.

echo
    If set, each command with its arguments is echoed just before it is executed. For non-builtin commands all expansions occur before echoing. Builtin commands are echoed before command and filename substitution, because these substitutions are then done selectively. Set by the -x command line option.

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