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I am having 4 field in a file
name age date status
i want to update or rewrite a value of status with another value
how it can be done
i used awk & sed but it shows result but not updating in...

Thanks friend

sed -n '57p' filename

My file contains 57 lines ,the above command prints the 57 th line,but i want to assign the result of this to a variable, to compare with another line in a different file ...