I also like to point out that in the input file the keyword will be declared as below 
Input.txt(input file) 
OPT: SEL_BLOCK [ 
 some text to be copied to output file
 if SEL_BLOCK = 1
]

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SEL_BLOCK will be defined in a config file which can be included in the perl script. The script will have visibilty of the value of SEL_BLOCK and take appropriate actions(copying contents from input to output file).

In reply to Re^3: Checking value of an extracted variable by r.biswas
in thread Checking value of an extracted variable by r.biswas

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