Hi,

I'm assuming this post is OT.
I expect that the problem is explained in terms of the Linux operating system.
I run: 
$ which perl
/home/sisyphus-sis/blead-5.33.1-m64-ld/bin/perl

[download]
and I therefore assume that perl and /home/sisyphus-sis/blead-5.33.1-m64-ld/bin/perl will be one and the same ... but they're not. 
$ /home/sisyphus-sis/blead-5.33.1-m64-ld/bin/perl -le 'print $];'
5.033001
$ perl -le 'print $];'
5.014002

[download]
How is this explained ?
It seems to happen when, having specified a $PATH that contains perl-5.014002 as the first perl in $PATH, I then position a different perl (5.33.1) ahead of perl-5.014002 in $PATH (without actually altering $PATH).
So, I'm thinking it's some sort of caching bug in my Debian wheezy system. (I haven't yet checked to see whether Ubuntu-18.04 does the same thing.)

Is it buggy behaviour ? ... or is there some clever legalese that justifies it ?

Cheers,
Rob

PS
To elaborate, I built 5.33.1 into the above-specified location, and prepended that above-specified location (ie /home/sisyphus-sis/blead-5.33.1-m64-ld/bin) to $PATH, but both perl -V and which perl reported the system perl (5.014002), which is further along in $PATH.

This happened because I forgot to build perl-5.33.1 with the -Uversiononly configure option, and the perl executable was in fact named perl5.33.1
So I created a copy of perl5.33.1 named perl and, while which perl now specifies this copy of perl5.33.1, if I invoke perl it's still the system perl that is executed.
Seems insane to me.

In reply to [OT] 'perl' is not the 'perl' reported by 'which perl' by syphilis

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