in reply to -E behavior with stdin script

Note -E doesn't turn on strict, AFAICT its equivalent is -Mfeature=:all.

Update: Sorry, that's not quite right - :all also enables experimental features and features that were removed from feature bundles of later versions, like array_base. I showed a slightly hackish workaround here.

Update 2: Here's an improved version that gives exactly the same result as the -E switch:

use Config; use feature ":$Config{PERL_REVISION}.$Config{PERL_VERSION}";

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Re^2: -E behavior with stdin script
by almr (Acolyte) on Sep 05, 2021 at 09:28 UTC

    Ah. I was getting confused. So the least-verbose choices become, I think,

    • [-Mstrict] -Mfeature=:all -- - <<EOF to run a stdin script
    • [-Mstrict] -E script to run a stringified script
    • -Mv5.28 {-e script | -- -} (as of now) to require a recent perl with all security & unicode fixes, turn on strict, and run either a stdin or a stringified script.
      The least verbose option would be -MMyDefaults, where you write a module named MyDefaults that sets all the bits as you prefer and then you install that on each system you use :-)

      Sorry, I made a mistake, that's actually not exactly equivalent to -E, please see the updates in my node above.