* string commands: strcmp / strstr / strslice set a $variable
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.control
  strcmp  c "abc" "abc"
  strcmp  d "abc" "abd"
  strstr  p "hello world" "world"
  strslice s "abcdef" 2 3
  echo "strcmp equal=" $c "  differ=" $d
  echo "strstr pos=" $p
  echo "strslice=" $s
.endc
.end