Re: using set +o posix unsets POSIXLY_CORRECT, even when POSIXLY_CORRECT is a read only variable

[Cuong Manh Le]

readonly var=value prevent shell scripter changing value of variable var, there is no restriction for the shell itself.

Try:

set -o posix

readonly | grep SHELLOPTS

and:

set +o posix

readonly | grep SHELLOPTS

to see the missing of `posix` in 2nd command, the readonly variable SHELLOPTS was changed by the shell.

On Fri, Jan 1, 2016 at 7:04 AM, nerdopolis <bluescreen_avenger@verizon.net> wrote:

I tested on
4.2.45(1)-release

basically I have tested
nerdopolis@nerdopolis:~$ readonly POSIXLY_CORRECT=1
nerdopolis@nerdopolis:~$ set +o posix
nerdopolis@nerdopolis:~$ echo $POSIXLY_CORRECT

nerdopolis@nerdopolis:~$

Although I will admit I'm not sure if it's supposed to do that or not