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Try "grep -E" which is actually the same as "egrep".

Note the use of the circumflex character to mean "line starting with" in grep.

grep -E "^BAT|^SAT" /usr/local/names.txt >filenames.txt

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I am now confused with your requirement.
If you want the results in separate line, just do the following in your script


grep ^$2 $1 #this will print the matching lines in separate lines

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