Awk script to total the data returned from ps

ps-totaler.awk

#!/usr/bin/awk -f 

# Examples
#  $ ps -o pid,user,cpu,%cpu,%mem,nswap,sess,tty | ./ps_total.awk
#  Count : 58
#  USER  : 0
#  CPU   : 0
#  %CPU  : 1.8
#  %MEM  : 2.5
#  NSWAP : 0
#  SESS  : 0
#  TTY   : 0
#  PID   : 3272487
#  $ sudo ps -A -o pid,user,cpu,%cpu,%mem,nswap,sess,tty | ./ps_total.awk
#  Count : 395
#  USER  : 0
#  CPU   : 0
#  %CPU  : 47.4
#  %MEM  : 98.2
#  NSWAP : 0
#  SESS  : 0
#  TTY   : 0
#  PID   : 15177218
#  $ ps -A -o cpu,%cpu,%mem,nswap,p_ru,tsiz,vsz | ./ps_total.awk
#  Count : 395
#  %CPU  : 50.4
#  %MEM  : 98.3
#  NSWAP : 0
#  P_RU  : 0
#  TSIZ  : 0
#  VSZ   : 1062566720
#  CPU   : 0

# Todos
#   - Accept a list of columns to limit processing to - EG: ps -A | ./ps_total.awk -v cols=cpu%,mem%
#   - If the column header starts with %, then show it as a percentage
BEGIN {
  headers["count"] = 0
  totals[""]  = 0
  headerwid   = 2
}
{
  if ( NR == 1 ){
    for( i = 1; i <= NF; i++ ){
      headers[i] = $i
      totals[i]  = 0

      if ( length( i ) > headerwid )
        headerwid = length( i )
    }
    next
  }

  headers["count"]++

  for(i = 1; i <= NF; i++)
    totals[i] += $i
}
END {
  headerwid += 3
    printf("%-"headerwid"s : %s\n", "Count", headers["count"])
  for ( t in totals ) {
    if ( length(t) == 0 ) continue

    printf("%-"headerwid"s : %s\n", headers[t], totals[t])
  }
}