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Need help on find and replacement on specific line and position

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# 1  
Old 01-15-2014
Need help on find and replacement on specific line and position
I have a file with 100 lines. On 50 th line , from position 5 to rest of the data , I need to change the occurrence of A to B and Occurrence of M to N.

Input file :

Code:
Line1 
Line2
Line3
--
--
12345ABCDEFM   

---
--
Line 100

Output


Code:
Line1 
Line2
Line3
--
--
12345BBCDEFN   

---
--
Line 100

Last edited by Don Cragun; 01-15-2014 at 05:22 PM.. Reason: Add CODE tags.
# 2  
Old 01-15-2014
Code:
awk 'NR==50{gsub("A","B");gsub("M","N")}1' file

# 3  
Old 01-15-2014
Quote:
Originally Posted by Yoda
Code:
awk 'NR==50{gsub("A","B");gsub("M","N")}1' file

I may have A or M from 1 to 6 but it should remain


Input file :

Code:
Line1 
Line2
Line3
--
--
1A345ABCDEFM 

---
--
Line 100

Output


Code:
Line1 
Line2
Line3
--
--
1A345BBCDEFN 

---
--
Line 100

Last edited by Don Cragun; 01-15-2014 at 05:30 PM.. Reason: Add CODE tags again.
# 4  
Old 01-15-2014
Code:
sed '50s/A/B/;50s/M/N/' myFile

---------- Post updated at 04:25 PM ---------- Previous update was at 04:23 PM ----------

Quote:
Originally Posted by Rajesh_us
I may have A or M from 1 to 6 but it should remain


Input file :

Line1
Line2
Line3
--
--
1A345ABCDEFM

---
--
Line 100

Output


Line1
Line2
Line3
--
--
1A345BBCDEFN

---
--
Line 100
Please provide a representative sample of input and the desired output using code tags
# 5  
Old 01-15-2014
Quote:
Originally Posted by vgersh99
Code:
sed '50s/A/B/;50s/M/N/' myFile

A to B or M to N conversion should happen from position 6 to rest of the data in the line
# 6  
Old 01-15-2014
Quote:
Originally Posted by Rajesh_us
A to B or M to N conversion should happen from position 6 to rest of the data in the line
Code:
awk '
        NR == 50 {
                i = sprintf ( "%s", substr ( $0, 1, 5 ) )
                j = sprintf ( "%s", substr ( $0, 6 ) )
                gsub ( "A", "B", j )
                gsub ( "M", "N", j )
                $0 = i j
        }
        1
' file

This User Gave Thanks to Yoda For This Post:
Rajesh_us
# 7  
Old 01-15-2014
Quote:
Originally Posted by Yoda
Code:
awk '
        NR == 50 {
                i = sprintf ( "%s", substr ( $0, 1, 5 ) )
                j = sprintf ( "%s", substr ( $0, 6 ) )
                gsub ( "A", "B", j )
                gsub ( "M", "N", j )
                $0 = i j
        }
        1
' file

Thanks a lot .. let me try and get back to u
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