_arg_chk                 argument check
ARGC                     command arguments
ARGI                     command arguments
ARGV                     command arguments
CYCLE_COUNT              Count of cycle statement
DEGREES                  degree flag
ENVIRON                  Environment strings
FALSE                    false
FILENAME                 file name
FNR                      Record Number
FS                       Field Separator
LONGEST_EXP              Longest Expression
MAX_CYCLE                Max count of cycle statement
NF                       Field Count
NG                       expression count
NR                       Record Count
OFMT                     Output Format
OFS                      Field Separator
ORS                      Record Separator
RETAIN_FS                Field Separator
RS                       Record Separator
TRACE                    Statement Trace
TRANS_FROM               String Translation
TRANS_TO                 String Translation
TRUE                     true
CLENGTH                  Match Length
CSTART                   Match Start
MLENGTH                  Match Length
MSTART                   Match Start
RLENGTH                  Match Length
RSTART                   Match Start
vargc                    Variable Arguments
vargv                    Variable Arguments