Add copyright
update setenv (see /usr/src/bin/csh/sh.func.c)
allow setenv with 0 and 1 arugments: setenv -> printenv setenv x -> setenv x ''
add SIGUSR1 and SIGUSR2
check in for karels, removed dependencies on standard include files
expand symbolic link before ..
4.3BSD beta release manual page
manual page distributed with 4.2BSD
manual page distributed with 4.1BSD
don't use passwd for our own home directory, just use variable "home"(from broome)
use xalloc not malloc
limit and unlimit bug fixed,plus -h to set and unset hard limits
check for set group id as well as setuid
boiler plate around killpg()
better argument cracking
null pointers; system call boiler plate
check for reference through null pointer
check for null pointer reference
load history after sourcing .login file in case .login sets history variable
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