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Re: export loses error


From: Chet Ramey
Subject: Re: export loses error
Date: Tue, 9 Feb 2021 10:23:51 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.7.0

On 2/8/21 5:29 PM, gregrwm wrote:
   $ export vim=$HOME/.GVim-v8.2.2451.glibc2.15-x86_64.AppImage
   $
   $ vimV=$($vim --version)||echo handle error here              #without
export, error is captured
fuse: failed to exec fusermount: No such file or directory
open dir error: No such file or directory
handle error here
   $
   $ export vimV=$($vim --version)||echo handle error here       #with
export, error is lost
fuse: failed to exec fusermount: No such file or directory
open dir error: No such file or directory
   $

It's the assignment statement that's the oddball here; it's the only place
where the exit status from a command substitution has any effect. This is a
POSIX (maybe ksh) invention to provide assignment statements with a useful
exit status.

The `export' builtin completed successfully: it assigned the correct value
to `vimV' and marked it for export.

--
``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/



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