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Hi dsravan,
sed can work the entire file (it may take the test_jan2 as an input). So I don't see the need for it to be fed line by line (for loop). Also if using a loop, you would need to redirect...

At least in SUSE, the sort command is like this:

sort [OPTIONS] ... [FILE]

you had the file before the options.

Try this instead (it worked for me):

sort -k 21 -o file_2 -r file_1
...