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Reading line1 with line2 and line 2 with line 3 in unix

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# 1  
Old 12-17-2011
Reading line1 with line2 and line 2 with line 3 in unix
Hi,

I have a requirement where i have to read a file line by line and see if the string(fixed postion 10 to 15 in the file) in line 2 is greater than string in line 1.
I have used following code

Code:
while read LINE1 
       do
       current_inv_no=$(echo "$LINE1" | cut -c 10-15)
       read LINE2 
       next_inv_no=$(echo "$LINE2" | cut -c 10-15)
//i will compare the nos here
       done <$file

The problem with the above code is line1 is compared with line 2 and line 3 is compared with line 4.
But my requirement is i want to compare line 1 with line 2 and line 2 with line 3 and so on

can some one help me on this.

Thanks!
Last edited by zxmaus; 12-17-2011 at 02:01 PM..
# 2  
Old 12-17-2011
Code:
prev=""
while read LINE
do
     curr=${LINE:9:6} # 1st = ind is 0
     # 1st line special case
     [ "$prev" = ""  ] && prev="$curr"  && continue  # next line 

     [ "$prev" != "$curr"  ] && echo "not equal"  || echo "equal"
      
     prev="$curr"
done <$file

Last edited by kshji; 12-17-2011 at 01:39 PM..
# 3  
Old 12-17-2011
Hi,

Thanks a lot it is working...
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