> In bash (as can be seen with "help :" without the quotes at the bash
> prompt) : is a do-nothing command. So it can be regarded as
> legitimate to treat it as a comment.
While it is true that the : command does nothing, its arguments are
still expanded, redirections are performed, and it sets the exit
code to 0, so it is not true that it can be regarded as a comment
line.
As a practical example, this command tests USER and if it is unset
or empty, sets it to the output of whoami.
: ${USER:=`whoami`}
Regards,
Gary
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