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Add a character C in a column if that column is blank

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# 1  
Old 08-26-2013
Add a character C in a column if that column is blank
I have some files that look as follows. I need to add a character 'C' in the fifth column if that column is blank. I prefer in-place editing.
Code:
    1    1 B M              0   0  203      0, 0.0     0, 0.0     0, 0.0     0, 0.0   0.000 360.0 360.0 360.0 141.9   15.4   28.8   66.1
    2    2 B A        +     0   0   96      2,-0.0     2,-0.1     0, 0.0     0, 0.0   0.211 360.0 128.7-112.4   7.4   18.7   30.7   66.2
    3    3 B K        -     0   0  170      1,-0.0     2,-0.3     0, 0.0     0, 0.0  -0.311  37.4-173.9 -67.6 143.5   20.5   27.4   65.6
    4   44 B M  G <  S+     0   0  159     -3,-2.3    -1,-0.2    -4,-0.3    -2,-0.2   0.445  80.4 133.6 -94.8   0.2   11.7   15.9   -0.7
    5   45 B L    <   -     0   0   46     -3,-1.4    -3,-0.0    -4,-0.2     5,-0.0  -0.218  64.1-113.7 -57.2 131.3   15.2   17.0    0.3
    7  541 A E  S    S-     0   0  135     -3,-0.1    -1,-0.1     0, 0.0    -2,-0.0   0.150  74.0  -8.3-107.3-139.1   42.1   66.5   41.6
    8  542 A E  S    S-     0   0  170      1,-0.1     4,-0.1    -2,-0.1    -2,-0.1   0.348  84.9-132.3 -44.0  -5.3   41.2   70.2   42.2
    9  543 A E        +     0   0   38      1,-0.2     3,-0.2     2,-0.1    -1,-0.1   0.934  39.1 177.3  45.2  63.8   39.8   69.0   45.6

Desired Output

Code:
    1    1 B M  C           0   0  203      0, 0.0     0, 0.0     0, 0.0     0, 0.0   0.000 360.0 360.0 360.0 141.9   15.4   28.8   66.1
    2    2 B A  C      +    0   0   96      2,-0.0     2,-0.1     0, 0.0     0, 0.0   0.211 360.0 128.7-112.4   7.4   18.7   30.7   66.2
    3    3 B K  C      -    0   0  170      1,-0.0     2,-0.3     0, 0.0     0, 0.0  -0.311  37.4-173.9 -67.6 143.5   20.5   27.4   65.6
    4   44 B M  G <  S+     0   0  159     -3,-2.3    -1,-0.2    -4,-0.3    -2,-0.2   0.445  80.4 133.6 -94.8   0.2   11.7   15.9   -0.7
    5   45 B L  C <   -     0   0   46     -3,-1.4    -3,-0.0    -4,-0.2     5,-0.0  -0.218  64.1-113.7 -57.2 131.3   15.2   17.0    0.3
    7  541 A E  S    S-     0   0  135     -3,-0.1    -1,-0.1     0, 0.0    -2,-0.0   0.150  74.0  -8.3-107.3-139.1   42.1   66.5   41.6
    8  542 A E  S    S-     0   0  170      1,-0.1     4,-0.1    -2,-0.1    -2,-0.1   0.348  84.9-132.3 -44.0  -5.3   41.2   70.2   42.2
    9  543 A E  C      +    0   0   38      1,-0.2     3,-0.2     2,-0.1    -1,-0.1   0.934  39.1 177.3  45.2  63.8   39.8   69.0   45.6

# 2  
Old 08-26-2013
Code:
 awk '{a=substr($0, 17, 1);a=(a~/[a-z]/)?a:"C";print substr($0,1, 16) a substr($0,18)}' file
    1    1 B M  C           0   0  203      0, 0.0     0, 0.0     0, 0.0     0, 0.0   0.000 360.0 360.0 360.0 141.9   15.4   28.8   66.1
    2    2 B A  C     +     0   0   96      2,-0.0     2,-0.1     0, 0.0     0, 0.0   0.211 360.0 128.7-112.4   7.4   18.7   30.7   66.2
    3    3 B K  C     -     0   0  170      1,-0.0     2,-0.3     0, 0.0     0, 0.0  -0.311  37.4-173.9 -67.6 143.5   20.5   27.4   65.6
    4   44 B M  G <  S+     0   0  159     -3,-2.3    -1,-0.2    -4,-0.3    -2,-0.2   0.445  80.4 133.6 -94.8   0.2   11.7   15.9   -0.7
    5   45 B L  C <   -     0   0   46     -3,-1.4    -3,-0.0    -4,-0.2     5,-0.0  -0.218  64.1-113.7 -57.2 131.3   15.2   17.0    0.3
    7  541 A E  S    S-     0   0  135     -3,-0.1    -1,-0.1     0, 0.0    -2,-0.0   0.150  74.0  -8.3-107.3-139.1   42.1   66.5   41.6
    8  542 A E  S    S-     0   0  170      1,-0.1     4,-0.1    -2,-0.1    -2,-0.1   0.348  84.9-132.3 -44.0  -5.3   41.2   70.2   42.2
    9  543 A E  C     +     0   0   38      1,-0.2     3,-0.2     2,-0.1    -1,-0.1   0.934  39.1 177.3  45.2  63.8   39.8   69.0   45.6

# 3  
Old 08-26-2013
Hi Jotne,

I tried your code . I don't get the output like you. I got the following output. All the characters in the 5th column are changing in to C.

Code:
    1    1 B M  C           0   0  203      0, 0.0     0, 0.0     0, 0.0     0, 0.0   0.000 360.0 360.0 360.0 141.9   15.4   28.8   66.1
    2    2 B A  C     +     0   0   96      2,-0.0     2,-0.1     0, 0.0     0, 0.0   0.211 360.0 128.7-112.4   7.4   18.7   30.7   66.2
    3    3 B K  C     -     0   0  170      1,-0.0     2,-0.3     0, 0.0     0, 0.0  -0.311  37.4-173.9 -67.6 143.5   20.5   27.4   65.6
    4   44 B M  C <  S+     0   0  159     -3,-2.3    -1,-0.2    -4,-0.3    -2,-0.2   0.445  80.4 133.6 -94.8   0.2   11.7   15.9   -0.7
    5   45 B L  C <   -     0   0   46     -3,-1.4    -3,-0.0    -4,-0.2     5,-0.0  -0.218  64.1-113.7 -57.2 131.3   15.2   17.0    0.3
    7  541 A E  C    S-     0   0  135     -3,-0.1    -1,-0.1     0, 0.0    -2,-0.0   0.150  74.0  -8.3-107.3-139.1   42.1   66.5   41.6
    8  542 A E  C    S-     0   0  170      1,-0.1     4,-0.1    -2,-0.1    -2,-0.1   0.348  84.9-132.3 -44.0  -5.3   41.2   70.2   42.2
    9  543 A E  C     +     0   0   38      1,-0.2     3,-0.2     2,-0.1    -1,-0.1   0.934  39.1 177.3  45.2  63.8   39.8   69.0   45.6

# 4  
Old 08-26-2013
Then your data on your PC is not the same as in example above.
Try copy data in post #1 to a file and then run the code.
Its important that all data are at same position.

Your data is at position #17 in your example.

This should give same as I have here, if not try to change 17 to some other.
Code:
awk '{print substr($0, 17, 1)}' file



G

S
S

# 5  
Old 08-26-2013
Thank you for your reply. I did with the example which I gave. But I get the same result.
# 6  
Old 08-26-2013
And the output of line in post 4 is what?
What os are you running?

And do you get the same output as I do here:
Code:
awk '{print substr($0, 14, 4)}' file
M
A
K
M  G
L
E  S
E  S
E

# 7  
Old 08-26-2013
My OS is ubuntu 12.04.

Code:
thejitha@ubuntu:~/Desktop$ awk '{print substr($0, 14, 4)}' thejitha
M   
A   
K   
M  G
L   
E  S
E  S
E   
thejitha@ubuntu:~/Desktop$ awk '{print substr($0, 17, 1)}' thejitha


G
 
S
S

Last edited by thejitha; 08-26-2013 at 05:59 AM..
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