[michael@freebsd ~]$ cat crypt.c
#include <unistd.h>
#include <stdio.h>

int main(int argc, char **argv) {
  printf("Output: %s\n", crypt("michael", "a$"));
}
[michael@freebsd ~]$ gcc -lcrypt crypt.c -o crypt
[michael@freebsd ~]$ ./crypt
Output: a$pY7ql40tspk
[michael@freebsd ~]$ uname -r
9.0-RELEASE

FreeBSD:
Output of 'michael', 'ae': ae6RDTK/1mQ.A
Output of 'michael', 'a.': a.pY7ql40tspk
Output of 'michael', 'a$': a$pY7ql40tspk
Output of 'michael', 'a ': a pY7ql40tspk
Output of 'michael', 'a:': a:pY7ql40tspk

Linux:
Output of 'michael', 'ae': ae6RDTK/1mQ.A
Output of 'michael', 'a.': a.pY7ql40tspk
Output of 'michael', 'a$': a$OO6Gf8iYdaU
Output of 'michael', 'a ': a 8w8/DSxWjzQ
Output of 'michael', 'a:': a:Pss8me0ctYE

:5697903 in that test case, yes, but:

Output:12345678+$2 :
Output:12345678+.2 .26Y1GW.Ks5mY
Output:12345678+2$ 2$l1tWQFkUcLU
Output:12345678+$. $.EXlUiP8mHCU
Output:12345678+22 22UK7H4zUN8ro
Output:12345678+a$ a$15yiPJnbs/U
Output:12345678+$a $aDzAqF440xDE

>>> crypt.crypt('michael', '$8$abcdefgh$')
'$8N/UM.leLmH6'
>>> crypt.crypt('michael', '$2$abcdefgh$')
':'
>>> crypt.crypt('michael', '$5$abcdefgh$')
'$5$abcdefgh$dheqqYfUsoZmM4yARhDaIN66Yq9x2IH7OopHpFBCrBD'