>   Am I missing something here ???
[...]
>       <wtenhave@berend:3> /bin/cat /tmp/P | /bin/sort -n | /usr/bin/uniq
>       5
>       1
>       4
>       2

The most likely candidate is a broken locale file.  textutils as of
version 2.0 and later user specified locale data to affect collating
sequences to handle native language differences.  When this is set
non-ASCII sorting as per local collating conventions is used.  This is
mostly likely due to you setting LC_ALL to something such as possibly
en_US.

You should set LC_ALL to POSIX and try your test again.

  export LC_ALL=POSIX  # If you use bash, ksh, sh, etc.
  setenv LC_ALL POSIX  # If you use a csh, tcsh.

If sort behaves as you expect then the problem is with the locale
data on the system.

Bob

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