code
macname@localhost Desktop % cat content fox jumps over the lazy dog. fox jumps over the lazy dog. fox jumps over the lazy dog. fox jumps over the lazy dog. macname@localhost Desktop % macname@localhost Desktop % sed 's/dog/cat/' content fox jumps over the lazy cat. fox jumps over the lazy cat. fox jumps over the lazy cat. fox jumps over the lazy cat. macname@localhost Desktop % macname@localhost Desktop % cat content fox jumps over the lazy dog. fox jumps over the lazy dog. fox jumps over the lazy dog. fox jumps over the lazy dog. macname@localhost Desktop %