The synopsis for the help builtin is missing the -m option:
help: help [-ds] [pattern ...]
Also, the PATTERN is not a pattern in the usual sense, it the
beginning of a command:
$ help -d c
caller - Return the context of the current subroutine call.
case - Execute commands based on pattern matching.
cd - Change the shell working directory.
command - Execute a simple command or display information about commands.
compgen - Display possible completions depending on the options.
complete - Specify how arguments are to be completed by Readline.
compopt - Modify or display completion options.
continue - Resume for, while, or until loops.
coproc - Create a coprocess named NAME.
As a result, it is not possible to have help print just the help
for time or read, for example, they always include times,
readarray, and readonly:
$ help -d time read
time - Report time consumed by pipeline's execution.
times - Display process times.
read - Read a line from the standard input and split it into fields.
readarray - Read lines from a file into an array variable.
readonly - Mark shell variables as unchangeable.
--
Chris F.A. Johnson, webmaster <http://woodbine-gerrard.com>
===================================================================
Author:
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
