please explain to me, it is too complex

[robertchen117]

Why the following is excuting the setup_env.sh, I am confused, grep?
grep is finding something?

grep (do { chop; s/^([^=]+)=(.*)$/$ENV{$1}=$2/e},`. /etc/software/
setup_env.sh; env`);

 

[J¨¹rgen Exner]

Why the following is excuting the setup_env.sh, I am confused, grep?
grep is finding something?

grep (do { chop; s/^([^=]+)=(.*)$/$ENV{$1}=$2/e},`. /etc/software/
setup_env.sh; env`);

Newline and white space is usually not a scarce resource. Use it liberally
to improve readability:

grep (do { chop; s/^([^=]+)=(.*)$/$ENV{$1}=$2/e
},
`. /etc/software/setup_env.sh; env`
);

So, in other words the second argument of grep is the qx command, here
written as backticks. Of course this command is executed, how else would
grep() be able to filter the list for those items indicated by the first
argument. What did you expect to happen?

jue