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

[Peng Yu]

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?

$ cat main.sh
#!/usr/bin/env bash
# vim: set noexpandtab tabstop=2:

set -v
readonly x
x=abc ./script.sh

$ cat script.sh
#!/usr/bin/env bash
# vim: set noexpandtab tabstop=2:

echo "$x"
$ ./main.sh
readonly x
x=abc ./script.sh
./main.sh: line 6: x: readonly variable

-- 
Regards,
Peng