1The **-V** option
2^^^^^^^^^^^^^^^^^
3
4**Syntax**
5
6.. _-V:
7
8**-V**\ [*level*]
9    Select verbosity level [**w**]. |Add_-V|
10
11**Description**
12
13The **-V** option controls the verbosity mode, which determines which messages are sent to standard error. Choose among
147 levels of verbosity; each level adds more messages:
15
16- **q** - Quiet, not even fatal error messages are produced.
17- **e** - Error messages only.
18- **w** - Warnings (by default, same as running without **-V**)
19- **t** - Timings (report runtimes for time-intensive algorithms).
20- **i** - Informational messages (same as **-V** only).
21- **c** - Compatibility warnings (if compiled with backward-compatibility).
22- **d** - Debugging messages.
23
24This option can also be set by specifying the default :term:`GMT_VERBOSE` as **quiet**, **error**, **warning**,
25**timing**, **compat**, **information**, or **debug**, in order of increased verbosity [default is **warning**].