Re: bash conditional expressions

[Chet Ramey]

On 11/12/21 12:16 PM, Lawrence Velázquez wrote:

> > As I understand it, -N stands for NEW and therefore should return a true
> > when either a 'touch -a test' or a 'touch -am test' is given.
>
> FWIW, there's some disagreement on this.

Not very much.

>      % cat foo_test
>      test -N foo
>      echo "$?"
>      % touch foo
>      % /bin/bash -c 'echo "$BASH_VERSION"; . ./foo_test'
>      3.2.57(1)-release
>      0

Yes, this is the substance of the bug report. That version of the bash
builtin `test', which is around 15 years old, did it wrong. It was
finally fixed in bash-5.1.


>      % /opt/local/bin/bash -c 'echo "$BASH_VERSION"; . ./foo_test'
>      5.1.8(1)-release
>      1
>      % ksh -c 'echo "${.sh.version}"; . ./foo_test'
>      Version AJM 93u+ 2012-08-01
>      1
>      % yash -c 'echo "$YASH_VERSION"; . ./foo_test'
>      2.51
>      1
>      % zsh -c 'echo "$ZSH_VERSION"; . ./foo_test'
>      5.8
>      0

So zsh is the outlier.

--
``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/