Question

In shell script, how do I iterate through each line in an ASCII file and perform an operation on its value

This is the example for an ASCII file which I have

 23      3.4e-09     55.90       5.7e-07 24        12.5      79.90       7.9e-09 25        67.9      78.9       3.4e-09 26        98.8      89.67       9.7e-09 

how cum it will take first line and the iterate…

WAT DO U MEAN BY LINE

Answer 1

One way (in bash and ksh, at least, may also work in plain sh) is by using something like:

 while read line do   ... done 

However, this will modify whitespace on each line. If you have a ‘sufficiently fixed’ format on the lines (say each line is ValA ValB ValC), you can modify read line to read vala valb valc