Re: bash conditional expressions

[Michael J. Baars]

Yeeh, that's funny indeed :)

Now this: 

time ( test2Y=$(stat -c %Y test2); for (( i=0; i<1024; i++ )); do if (( $(stat 
-c %Y test1) < ${test2Y} )); then echo >> /dev/null; else echo >> /dev/null; fi;
done; );

real    0m4.503s
user    0m1.048s
sys     0m3.240s

time ( for (( i=0; i<1024; i++ )); do if [[ -N test1 ]]; then echo >> 
/dev/null; else echo >> /dev/null; fi; done; );

real    0m0.034s
user    0m0.023s
sys     0m0.009s

On Fri, 2021-11-12 at 12:16 -0500, Lawrence Velázquez wrote:
> On Fri, Nov 12, 2021, at 4:36 AM, Mischa Baars wrote:
> > Using Fedora 32 (bash 5.0.17) this returns a true, while on Fedora 35 (bash
> > 5.1.8) this returns a false:
> > touch test; if [[ -N test ]]; then echo true; else echo false; fi;
> > 
> > [...]
> > 
> > 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.
> 
>     % cat foo_test
>     test -N foo
>     echo "$?"
>     % touch foo
>     % /bin/bash -c 'echo "$BASH_VERSION"; . ./foo_test'
>     3.2.57(1)-release
>     0
>     % /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
>