i have been pondering perl's ancestry and for curiosity's sake i have been thinking about which languages (if any) influenced various perl feature. some are borrowed from one language which borrowed from an earlier one. some are pure perl from the head of larry and his cohorts.
some are very obvious (or not). here is a starting list. feel free to add, comment or flame.
math infix ops (+, *, /, etc) C exponentiation (**) PL/I (others too) math comparison ops (==, >, ) C (others used = for ==) assignment ops (+=) C short circuit ops (||, &&) C (text versions are perl) bit ops ( |, &, ^, <<, >> ) C auto-increment/decrement C (magic ++ is perl) dereference (->) C (from PL/I) scalar range (..) awk (list .. is perl) bind (=~) awk scalars as string or number sh arrays of scalars csh? (the $a syntax is similar)
tr/// tr, sed y (does anyone use y?) s/// sed m// many unix programs (awk,sed,more,etc.)
-p option sed -n option awk
varying lenghth strings (no \0 needed) sh, PL/I substr PL/I