Re: How do we get state of a flag in set -o ...

[Chet Ramey]

On 7/11/23 3:54 PM, Budi wrote:
> EDIT:
>
> How do we get state of a flag in set -o ... that has no directly alias
> set [-+] , e.g.
> set -o posix
> or
> set -o vi
> ?
>
> not, e.g. set -o errexit , as it can be retrieved by echo $-

Two ways:

test -o optname

or

shopt -q -o optname

In each case, the return status is 0 if the option is enabled, 1 if it is not.

For example,

set -o posix
test -o posix && echo enabled
shopt -q -o posix && echo enabled

will echo `enabled' twice.

You can also check $SHELLOPTS, but the above two are easier.

--
``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/