On 3/21/17 11:35 AM, Grisha Levit wrote:
> If the history is empty (or if HISTSIZE is 1) running `fc -l' produces an
> error:
>
> $ history -c
> $ fc -l
> bash: fc: history specification out of range
fc deals with the commands in the history list before the `fc' (that's
what the `previous command' in the Posix description means; it's equivalent
to -1). So saying fc -l, which is equivalent to fc -l -16 (or
fc -l -16 -1), is out of range. Even fc -l -1 is out of range.
ksh93 and mksh both print (different) errors; dash doesn't.
> I'm not sure this is necessary, since other instances of `first' and
> `last' being outside of the saved history range don't produce an
> error.
Posix says explicitly that they don't when there are commands in the
history list, but you have to specify them.
Also the `history' command doesn't have this behavior:
>
> $ history -c
> $ history
> 1 history
Because `history' doesn't skip to the previous command.
> As a special case, `fc -l -0' usually prints itself but not in the
> empty history (or HISTSIZE=1) case.
Yeah, that's a special case, but not when there are no commands in
the history list.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
