VT-IS-UTF8(1) Linux Users Manual VT-IS-UTF8(1)
vt-is-UTF8 - check whether current VT is in UTF8- or byte-mode.
vt-is-UTF8 [-h|--help] [-V|--version] [-q|--quiet]
vt-is-UTF8 checks whether the current VT is in UTF8 mode, by writing
(and erasing afterwards) a 3-byte-long UTF8 sequence, and looking how
much chars where displayed by the console driver.
A message telling in which mode the console is is then written to std
out (except if the --quiet option was given).
If the --quiet option is not given, the value returned is 1 if an error
occurs, else 0.
display version number, a short help message and exit.
display version number and exit.
do not print on stdout in with mode we are, but return the state
as exit-status 1 if in UTF8-mode, 0 if in byte-mode. In case of
error, 0 is returned and a message is displayed on stderr.
The check should be done by directly asking the kernel, which is not
possible as of kernels 2.0.x.
As of kernel 2.0.35, the byte-mode is sometimes erroneously detected as
UTF8-mode, after switching from a 512-chars font to a 256-chars font.
This is probably a console-driver bug.
Console tools 10 Aug 1998 VT-IS-UTF8(1)