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awk/sed problem

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# 1  
Old 12-14-2011
awk/sed problem
I have a bunch of files I need to change a letter to another letter only in the first column of a space delimited file. The problem is that after the first column, there's comments and such that cause problems with awk.

Here's what my data looks like:
Code:
16a28.0a27.0a26.0a25.0a24.67.255.200
144a28.128a27.128a26.128a25.0a24.67.255.200
128a28.128a27.128a26.128a25.0a24.67.255.200
120a29.112a28.96a27.64a26.0a25.0a24.67.255.200
12a32.12a31.12a30.8a29.0a28.0a27.0a26.0a25.0a24.67.255.200
112a29.112a28.96a27.64a26.0a25.0a24.67.255.200
10a32.10a31.8a30.8a29.0a28.0a27.0a26.0a25.0a24.67.255.200
0a24.67.255.200
0a24.56.255.200
0a24.55.255.200
0a25.0a24.122.255.200

Again, this is a space delimited file and this is just the first column. I want to change the a to b and not affect the rest of the data.

Thanks,
Dave
# 2  
Old 12-14-2011
Try:
Code:
awk '{gsub("a","b",$1)}1' file

# 3  
Old 12-14-2011
Quote:
Originally Posted by bartus11
Try:
Code:
awk '{gsub("a","b",$1)}1' file

Using the code of Bartus, I thing that he wants is:
Code:
soy@machine: temporal > nawk -F"." '{gsub("a","b",$1)}1' uno.txt
16b28 0a27 0a26 0a25 0a24 67 255 200                                
144b28 128a27 128a26 128a25 0a24 67 255 200                         
128b28 128a27 128a26 128a25 0a24 67 255 200                         
120b29 112a28 96a27 64a26 0a25 0a24 67 255 200                      
12b32 12a31 12a30 8a29 0a28 0a27 0a26 0a25 0a24 67 255 200          
112b29 112a28 96a27 64a26 0a25 0a24 67 255 200                      
10b32 10a31 8a30 8a29 0a28 0a27 0a26 0a25 0a24 67 255 200           
0b24 67 255 200                                                     
0b24 56 255 200                                                     
0b24 55 255 200                                                     
0b25 0a24 122 255 200

# 4  
Old 12-14-2011
Code:
[root@hostname test]# cat input
16a28.0a27.0a26.0a25.0a24.67.255.200 16a28.0a27.0a26.0a25.0a24.67.255.200
144a28.128a27.128a26.128a25.0a24.67.255.200 144a28.128a27.128a26.128a25.0a24.67.255.200

Code:
[root@hostname test]# perl -lane '$F[0]=~s/a/b/g; print "@F"' input
16b28.0b27.0b26.0b25.0b24.67.255.200 16a28.0a27.0a26.0a25.0a24.67.255.200
144b28.128b27.128b26.128b25.0b24.67.255.200 144a28.128a27.128a26.128a25.0a24.67.255.200

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