printf "Hello %s, welcome to %s.\n" "$USER"
printf "Hello %s, welcome to %s.\n" "$USER" "$HOSTNAME"
ShellCheck has noticed that you're using a
printf format string with more
%s variables than arguments to fill them.
In the problematic example case, the last
%s will just become an empty string every time.
Either remove the unused variables from the format string, or add enough arguments to fill them.
When using the Ksh/Bash
%T timestamp extension, such as
printf 'The time is %(%H:%M)T\n', an argument of
-1 and no argument are both taken to mean the current time. In these cases, consider specifying
ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.