(coreutils.info)sleep invocation

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25.1 `sleep': Delay for a specified time
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`sleep' pauses for an amount of time specified by the sum of the values
of the command line arguments.  Synopsis:

     sleep NUMBER[smhd]...

   Each argument is a number followed by an optional unit; the default
is seconds.  The units are:

`s'
     seconds

`m'
     minutes

`h'
     hours

`d'
     days

   Historical implementations of `sleep' have required that NUMBER be
an integer, and only accepted a single argument without a suffix.
However, GNU `sleep' accepts arbitrary floating point numbers (using a
period before any fractional digits).

   The only options are `--help' and `--version'.  Note: Common
options.

   Due to shell aliases and built-in `sleep' command, using an
unadorned `sleep' interactively or in a script may get you different
functionality than that described here.  Invoke it via `env' (i.e.,
`env sleep ...') to avoid interference from the shell.

   An exit status of zero indicates success, and a nonzero value
indicates failure.