Copy input file based on condition

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# 1  
Old 11-09-2009
Copy input file based on condition


I am new to unix shell programming.

I want to write a shell script for a functionality existing in mainframe system.

I have one file as below as input


_ referes to blank
condition:whenever the input file is having &__ ,it should be replaced with
blanks ___. rest of the file should be copied.
Other records should be copied as it is to the output file.

The output file should be as below

Please help out with a shell script sample

# 2  
Old 11-09-2009
something like this :

sed 's/&__/___/' input_file > output_file

# 3  
Old 11-09-2009
Thanks Panyam.
It is working but

if the input record is like this it should not convert,but it is converting.

for example


should be

but it is converted

Basically it should convert only when & is occuring in first field.
# 4  
Old 11-09-2009
sed 's/^&__/___/' input_file > output_file

# 5  
Old 11-09-2009
Thanks Frans

It is working fine
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