Mention that trying to set
'columns'
Type: Numeric.
Default: Detected at startup by querying the terminal device. If
this fails, the value of environment variable 'COLUMNS' is used.
This variable contains the number of columns on terminal screen.
is useless, it is always overridden by at least $COLUMNS.
e.g., in
$ COLUMNS=1111 mail -E set\ columns=188 -H
here 188 is ignored, 1111 is respected.
mail (GNU Mailutils) 2.99.98
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