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Native Language System support (+)
The shell is eight bit clean (if so compiled; see the ver-
sion shell variable) and thus supports character sets
needing this capability. NLS support differs depending on
whether or not the shell was compiled to use the system´s
NLS (again, see version). In either case, 7-bit ASCII is
the default for character classification (e.g., which
characters are printable) and sorting, and changing the
LANG or LC_CTYPE environment variables causes a check for
possible changes in these respects.
When using the system´s NLS, the setlocale(3) function is
called to determine appropriate character classification
and sorting. This function typically examines the LANG
and LC_CTYPE environment variables; refer to the system
documentation for further details. When not using the
system´s NLS, the shell simulates it by assuming that the
ISO 8859-1 character set is used whenever either of the
LANG and LC_CTYPE variables are set, regardless of their
values. Sorting is not affected for the simulated NLS.
In addition, with both real and simulated NLS, all print-
able characters in the range 200-377, i.e., those that
have M-char bindings, are automatically rebound to self-
insert-command. The corresponding binding for the escape-
char sequence, if any, is left alone. These characters
are not rebound if the NOREBIND environment variable is
Astron 6.10.00 19 November 2000 34
TCSH(1) TCSH(1)
set. This may be useful for the simulated NLS or a primi-
tive real NLS which assumes full ISO 8859-1. Otherwise,
all M-char bindings in the range 240-377 are effectively
undone. Explicitly rebinding the relevant keys with bind-
key is of course still possible.
Unknown characters (i.e., those that are neither printable
nor control characters) are printed in the format
nn.
If the tty is not in 8 bit mode, other 8 bit characters
are printed by converting them to ASCII and using standout
mode. The shell never changes the 7/8 bit mode of the tty
and tracks user-initiated changes of 7/8 bit mode. NLS
users (or, for that matter, those who want to use a meta
key) may need to explicitly set the tty in 8 bit mode
through the appropriate stty(1) command in, e.g., the
~/.login file.
