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Full Discussion: Inputs from a file
Top Forums Shell Programming and Scripting Inputs from a file Post 97619 by matrixmadhan on Wednesday 1st of February 2006 04:38:41 AM
Old 02-01-2006
this is a round-abt way, better dont use it i thought of giving it a try thats it

Code:
# !/usr/bin/ksh
#1

#The above line indicates the run

num=`sed 2q $0 | tail -1 | sed 's/#//'`
cnt=1
counter=0
sum=0

while read line
do
if [ $cnt -eq $num ]
then
  if [ $counter -le 1 ]
  then
     sum=$(($sum + $line))
     counter=$(($counter + 1))
  else
     break
  fi
else
  cnt=$(($cnt + 1))
fi
done < data

echo "sum is $sum"
cnt=$(($cnt + 2))

sed 1q $0 > tmp
echo "#$cnt" >> tmp
awk 'NR>2' $0 >> tmp

mv tmp $0
chmod 744 $0
exit 0

Code:
>cat data
2
3
4
5
6
7
8
9

Code:
>sum.ksh
sum is 5

>sum.ksh 
sum is 9

>sum.ksh 
sum is 13

the above three are consecutive runs
 

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LEARN ABOUT SUNOS

sum

sum(1)								   User Commands							    sum(1)

NAME

       sum - print checksum and block count for a file

SYNOPSIS

       sum [-r] [file...]

DESCRIPTION

       The   sum utility calculates and prints a 16-bit checksum for the named file and the number of 512-byte blocks in the file. It is typically
       used to look for bad spots, or to validate a file communicated over some transmission line.

OPTIONS

       The following options are supported:

       -r	Use an alternate (machine-dependent) algorithm in computing the checksum.

OPERANDS

       The following operands are supported:

       file	A path name of a file.	If no files are named, the standard input is used.

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).

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect  the	execution  of	sum:  LC_CTYPE,  LC_MESSAGES,  and
       NLSPATH.

EXIT STATUS

       The following exit values are returned.

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Availability		     |SUNWesu			   |
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cksum(1), sum(1B), wc(1), attributes(5), environ(5), largefile(5)

DIAGNOSTICS

       "Read error" is indistinguishable from end of file on most devices; check the block count.

NOTES

       Portable applications should use cksum(1).

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

SunOS 5.10							    7 Nov 1995								    sum(1)
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