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Unix sed command to find multiple string patterns

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http://unix.stackexchange.com – I need to replace the "$$file_name=" value as discussed below in to_be format. File has the following content: AS_IS : $$a=abc.txt $$file_name=abc.ddd.aaa $$directory=/uasdua/asdsas $$a=c.txt $$file_name=ac.dd.ac $$directory=/uasdua/asdsas $$a=b.txt $$file_name=ee.d.a $$directory=/uasdua/asdsas to_be: $$a=abc.txt $$file_name=abc.ddd.aaaV1 $$directory=/uasdua/asdsas $$a=c.txt $$file_name=ac.dd.acV1 $$directory=/uasdua/asdsas $$a=b.txt $$file_name=ee.d.aV1 $$directory=/uasdua/asdsas (HowTos)