set strLst = `echo $argv[$firstArg-$lastArg] | tr ' ' '\n'  \
  | grep -ivE --   '(--check|--check-colpos)'  \
  | grep -ivE --   '(--sort|--sort-fields)'    \
  | grep -ivE --   '(--group|--group-table)'   \
  | grep -ivE --   '(--shift|--shift-table)'   \
  | grep -ivE --   '(-v|--vrb-level)'  \
  | grep -ivE --   '(-q|--quiet)'      \
  | grep -ivE --   '(-u|--usage)'      \
  | grep -ivE --   '(-e|--examples)'   \
  | grep -ivE --   '(-h|--help)'       \
  | grep -ivE --   '( (--shift=[0-9]+) | (--shift-table=[0-9]+) )'  \
  | grep -ivE --   '--((sort|group)=[0-9]+/[0-9]+(/[0-9]+)*)$' | tr '\n' ' '`

# --Read Command Line Arguments---------------------------------------------------------------------

# Set echo to recognize both the -n flag and backslashed escape sequences
set echo_style = "both"

# Perform numeric calculations using bc.
alias MATH 'set \!:1 = `echo "\!:3-$" | bc -l`'

# --Read Command Line Arguments---------------------------------------------------------------------

set ierr = 0
set iarg = 0
set opt_chkColPos = 0
set opt_sortFlds = 0
set opt_groupTbl = 0
set opt_shiftTbl = 0
set opt_verbose = 0
set opt_quiet = 0
set opt_usage = 0
set opt_examples = 0
set opt_help = 0

set vrb_usrInputFlag = 0
set Def_vrbLevel = 1
set Def_shiftLen = 3

set arg_fullNamesLst = ""
set narg = $#argv
while ($iarg < $narg)

  MATH iarg = $iarg + 1
  set arg = $argv[$iarg]
  set usrInputFlag = `echo $arg | awk '/=/ {print 1}; ! /=/ {print 0}'`
  set opt = `echo $arg | awk 'BEGIN {FS="="} {print $1}' | tr '[:lower:]' '[:upper:]'`
  set par = `echo $arg | awk 'BEGIN {FS="="} {print $2}'`

  switch ($opt)

    # -- Optional Arguments ------------------------------------------------------------------------

    case "--CHECK":                         # Separates numbers from characters.
    case "--CHECK-COLPOS":
      set opt_chkColPos = 1
      breaksw

    case "--SORT":
    case "--SORT-FIELDS":
      set arg_sortPtn = $par
      set opt_sortFlds = 1
      breaksw

    case "--GROUP":
    case "--GROUP-TABLE":
      set arg_groupPtn = $par
      set opt_groupTbl = 1
      breaksw

    case "--SHIFT":
    case "--SHIFT-TABLE":
      set arg_shiftLen = $par
      set opt_shiftTbl = 1
      breaksw

    case "-V":
    case "--VRB-LEVEL":
      set arg_vrbLevel = $par
      set opt_verbose = 1
      set vrb_usrInputFlag = $usrInputFlag
      breaksw

    case "-Q":
    case "--QUIET":
      set opt_quiet = 1
      breaksw

    case "-U":
    case "--USAGE":
      set opt_usage = 1
      breaksw

    case "-E":
    case "--EXAMPLES":
      set opt_examples = 1
      breaksw

    case "-H":
    case "--HELP":
      set opt_help = 1
      breaksw

    default:
      set arg_fullNamesLst = "$arg_fullNamesLst $arg"
      breaksw

  endsw

end   # while