#!/bin/bash

# "column totaler" ½ºÅ©¸³Æ®ÀÇ ´Ù¸¥ ¹öÀüÀ¸·Î
# °£Á¢ ÂüÁ¶¸¦ »ç¿ëÇؼ­,
# ´ë»ó ÆÄÀÏ¿¡¼­ ÁöÁ¤µÈ Ä÷³À» ¸ðµÎ ´õÇØ ÁÝ´Ï´Ù.

ARGS=2
E_WRONGARGS=65

if [ $# -ne "$ARGS" ] # ¸í·É¾îÁÙ ÀÎÀÚ °¹¼ö üũ.
then
   echo "»ç¿ë¹ý: `basename $0` filename column-number"
   exit $E_WRONGARGS
fi

filename=$1
column_number=$2

#===== ¿©±â±îÁö´Â ¿ø·¡ ½ºÅ©¸³Æ®¿Í ¶È°°³×¿ä. =====#


# ¿©·¯ÁÙÂ¥¸® awk ½ºÅ©¸³Æ®´Â awk ' ..... '  ¶ó°í ÇÏ¸é µË´Ï´Ù.


# awk ½ºÅ©¸³Æ® ½ÃÀÛ.
# ------------------------------------------------
awk "

{ total += \$${column_number} # °£Á¢ ÂüÁ¶
}
END {
     print total
     }

     " "$filename"
# ------------------------------------------------
# awk ½ºÅ©¸³Æ® ³¡.

# º¯¼ö °£Á¢ ÂüÁ¶´Â ½© ½ºÅ©¸³Æ® ¾È¿¡¼­ awk ½ºÅ©¸³Æ®¸¦ ¾µ ¶§ 
# ½© º¯¼ö ÂüÁ¶½Ã ±î´Ù·Î¿î ¿©·¯°¡Áö¸¦ ÇÇÇÏ°Ô ÇØ ÁÝ´Ï´Ù.
# Thanks, Stephane Chazelas.


exit 0