ACCT=0 # accounting
BRACEPAT=0 # C-shell {...,...} expansions (note , required)
ECHOPRINT=0 # make echo equivalent to print, overrides ECHO_N
ESH=1 # emacs edit option
ESHPLUS=0 # some additional emacs features
FLOAT=0 # floating point arithmetic
FS_3D=0 # 3d file system
IODELAY=0 # tries to delay for output to drain in edit modes
JOBS=1 # job notification job control if possible
LDYNAMIC=0 # dynamic loading for builtins, requires loader lib
MULTIBYTE=0 # multibyte character handling
NEWTEST=1 # new [[...]] compound command
OLDTERMIO=0 # for systems that must support both TCGETA and TCGETS
OLDTEST=1 # old test command as built-in
POSIX=0 # on for POSIX compatibility someday
P_SUID=0 # real uid's that require -p flag for setuid/setgid
PDU=0 # Portable Distributed UNIX (Newcastle connection)
RAWONLY=0 # make viraw the only vi mode. Sometimes set automatically
RDS=0 # ~host!user expansions
SEVENBIT=0 # strip the eigth bit from characters
SUID_EXEC=1 # execute /etc/suid_exec for suid, sgid script
TIMEOUT=0 # number of seconds for shell timeout, 0 disables feature
VSH=1 # vi edit option
