Those are commands to run from inside perl, not directly at shell level. $^X is the name of the current perl executable, for example, as mentioned in perlvar. Don't run them at the shell prompt as they will make no sense there.

HTH

In reply to Re^3: convert iso8601 to epoch time without using additional module by hippo
in thread convert iso8601 to epoch time without using additional module by swissknife

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