root:x:0:1:Root on Lectura:/:/sbin/sh
daemon:x:1:1::/:
bin:x:2:2::/usr/bin:
sys:x:3:3::/:
adm:x:4:4:Admin:/var/adm:
lp:x:71:8:Line Printer Admin:/usr/spool/lp:
uucp:x:5:5:uucp Admin:/usr/lib/uucp:
malias:x:9:9:Alias placeholder:/var/adm/malias:/bin/csh
rootcsh:x:0:1:Csh root on lectura:/:/usr/bin/csh
smmsp:x:25:25:SendMail Message Submission Program:/:
listen:x:37:4:Network Admin:/usr/net/nls:
nobody:x:60001:60001:Nobody:/:
noaccess:x:60002:60002:No Access User:/:
nobody4:x:65534:65534:SunOS 4.x Nobody:/:
gmt:x:28:46:Gregg Townsend:/home/gmt:/bin/ksh
whm:x:3086:46:William H. Mitchell:/home/whm:/usr/local/bin/bash
#include "/home/cs352/fall04/a6/readline.c"
typedef struct node {
    char *line;
    struct node *next;
    } node;
char *repl(char c, int n);