Without this additional quoting, the command usage string is incorrect
in case the template contains square brackets. For example, the usage
of the lsblob commands was printed as
Usage: lspl [-i] [-l] [-r] t
rather than the desired
Usage: lspl [-i] [-l] [-r] [pattern]
because the command "echo [pattern]" prints "t" since there is a
subdirectory called "t" in the source tree.