Re: [Help-bash] Is `readonly` too strict?

[Chet Ramey]

On 2/22/18 1:58 AM, Peng Yu wrote:
> Hi,
> 
> Running `main.sh` shows an error. But `x` is set for `script.sh` not
> `main.sh`. So I think that there should not be an error message. Is
> `readonly` interpreted too strictly in bash?

No. Posix has this to say when discussing variable assignments that precede
a simple command:

"If any of the variable assignments attempt to assign a value to a variable
for which the readonly attribute is set in the current shell environment
(regardless of whether the assignment is made in that environment), a
variable assignment error shall occur."

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_01

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