Filling empty cells


 
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# 1  
Filling empty cells

How do you fill empty cells that do not have any data in them with "X" in a tab delimited text file? Thanks!
# 2  
Perhaps an if statement?
Can you provide a before and after example?
# 3  
Example input:
Code:
203074_at       ANXA8     0
203088_at                     0
203131_at       PDGFRA    0
203169_at                      0
203176_s_at    TFAM       0
203213_at       CDC2        0

Example output:

Code:
203074_at       ANXA8     0
203088_at       X            0
203131_at       PDGFRA    0
203169_at       X             0
203176_s_at    TFAM       0
203213_at       CDC2        0

# 4  
just thinking...

what about a sed command for double tabs?
Code:
sed 's/\t\t/\tx\t/g' <file1 >file2

# 5  
^^ This. And you can do it in situ:

sed -i 's/\t\t/\tx\t/g' file1
 

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