cschu

1. Use ANSI-escaped string (last answer in https://stackoverflow.com/questions/25608503/using-single-quotes-with-echo-in-bash)

```
echo $'\''
```

2. via awk: use octal escape sequences (' = 39, https://unix.stackexchange.com/questions/593212/awk-print-apostrophe-single-quote)

```
awk '{print "\047" $0 "\047"}' input

cschu

def rotate(L, n_rotations):

    """
    rotates list L in place by n_rotations
    [a,b,c,d] -> [b,c,d,a] (n_rotations = 1)
    [a,b,c,d] -> [c,d,a,b] (n_rotations = 2)

    assumption:
    n_rotations can be at most |L| - 1, i.e. |L| rotations
    will result in L itself, |L| + 1 in L rotated once, etc.