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$ perl -e '@words = ("one\n","two\n","three\n","four\n","five\n","six\
+n",); chomp @words; print join";", @words;'
one;two;three;four;five;six

$ perl -e '@words = ("one\n","two\n","three\n","four\n","five\n","six\
+n",); @words = map {split /\n/, $_ } @words; print join";", @words;'
one;two;three;four;five;six

$ perl -e '@words = ("one\n","two\n","three\n","four\n","five\n","six\
+n",); @words = map {s/\n//; $_} @words; print join";", @words;'
one;two;three;four;five;six

$ perl -e '@words = ("one\n","two\n","three\n","four\n","five\n","six\
+n",); $_ = (split /\n/)[0] for @words; print join";", @words;'
one;two;three;four;five;six

$ perl -E '@words = ("one\n","two\n","three\n","four\n","five\n","six\
+n",); local $" = ";"; $_ = (split /\n/)[0] for @words; say "@words";'
one;two;three;four;five;six