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Full Discussion: How to add a particular column alone in a file
Top Forums Shell Programming and Scripting How to add a particular column alone in a file Post 302327130 by vgersh99 on Friday 19th of June 2009 06:43:09 PM
Old 06-19-2009
Quote:
Originally Posted by cutechaps
Thanks a lot

It worked, but a bit confused can you explain how this script performs?

Thanks once again.

---------- Post updated at 06:22 PM ---------- Previous update was at 06:05 PM ----------

And one more thing i want to print only the new lines in which the sum is stored. How to print it.
Code:
# if the number of fields is 6
NF == 6 { 
   # add to running tally of sum the value of the last (NF) field
   sum+=$NF
   # concatenate the current line to the running record of the previously encountered lines of 6 fields
   rec=(rec)?rec ORS $0 :$0
   # go to the NEXT line
   next
}
{
   # if the running record (rec) is NOT empty
   if (rec) {
   # print the 'summary line' (the line with 5 fields) followed by the sum
   # (sum) and followed by ORS (new line by default)
     print sumLine OFS sum ORS

    # reset the sum to 0 and rec to empty string
     sum=0; rec=""
    # assign the current line ($0) to a variable sumLine
     sumLine=$0
   }
}
END {

# take of the trailing record - same logic as before
  if (rec)
    print sumLine OFS sum ORS
}

 

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LEARN ABOUT SUNOS

sum

sum(1B) 					     SunOS/BSD Compatibility Package Commands						   sum(1B)

NAME

       sum - calculate a checksum for a file

SYNOPSIS

       /usr/ucb/sum file...

DESCRIPTION

       sum  calculates	and  displays a 16-bit checksum for the named file and displays the size of the file in kilobytes. It is typically used to
       look for bad spots, or to validate a file communicated over some transmission line. The checksum is calculated by an  algorithm	which  may
       yield different results on machines with 16-bit ints and machines with 32-bit ints, so it cannot always be used to validate that a file has
       been transferred between machines with different-sized ints.

USAGE

       See largefile(5) for the description of the behavior of sum when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sum(1), wc(1), attributes(5), largefile(5)

DIAGNOSTICS

       Read error is indistinguishable from EOF on most devices; check the block count.

NOTES

       sum and /usr/bin/sum (see sum(1)) return different checksums.

       This utility is obsolete.

SunOS 5.10							    8 Nov 1995								   sum(1B)
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