Your OS doesn't know about
You didn't mention a specific platform, but I can reproduce your problem:
% uname -a OSF1 hunter2 V5.1 2650 alpha % perl -e exit perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C").
My guess is you used ssh to connect to this older host from a newer desktop machine. It's common for
/etc/ssh/sshd_config to contain
AcceptEnv LANG LC_*
which allows clients to propagate into new sessions the values of those environment variables.
The warning gives you a hint about how to squelch it if you don't require the full-up locale:
% env LANG=C perl -e exit %
or with bash:
$ LANG=C perl -e exit $
For a permanent fix, choose one of
- On the older host, set the
LANGenvironment variable in your shell's initialization file.
- Modify your environment on the client side, e.g., rather than
ssh hunter2, use the command
LANG=C ssh hunter2.
- If you have admin rights, stop ssh from sending the environment variables by commenting out the
SendEnv LANG LC_*line in the local
/etc/ssh/ssh_configfile. (Thanks to this answer. See Bug 1285 for OpenSSH for more.)