Re: History -r breaks on FIFOs

[Chet Ramey]

On 1/21/21 11:18 AM, Merijn Verstraaten wrote:
> The history command doesn't seem to work when given a FIFO instead of a file. I was trying to load 
> history from FIFO using either 'history -r <(echo "$hist")' or 'echo "$hist" | 
> history -r /dev/stdin', but neither of these seem to work, due to the command being unable to handle 
> FIFOs.

Correct. The history file reading code requires the history file be a
regular file. This is because the technique it uses to read and process
the file (mmap or read the file in one read into a large buffer, then
move around in the buffer) doesn't work with non-regular files.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/