-v (On systems supporting the User Portability Utilities option.) Write a string to standard output
that indicates the pathname or command that will be used by the shell, in the current shell
execution environment (see Shell Execution Environment ), to invoke command_name, but do not
invoke command_name.
* Utilities, regular built-in utilities, command_names including a slash character, and any
implementation-defined functions that are found using the PATH variable (as described in
Command Search and Execution ), shall be written as absolute pathnames.
* Shell functions, special built-in utilities, regular built-in utilities not associated with a
PATH search, and shell reserved words shall be written as just their names.
* An alias shall be written as a command line that represents its alias definition.
* Otherwise, no output shall be written and the exit status shall reflect that the name was not
found.
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