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I need to copy a list of files in directory and only files with content DUMMY_B should be copy over to a new directory. How can i do that ? Thanks a lot.

Thanks a lot...
what if the file also contain chars that is not fixed as below example :
file1:
hello1
hello2
hello3_B,AAAtest1,N

or
file2:
hello1
hello2
hello3_B,AAAtest2V,N

or
...

Thanks a lot...
what if the file also contain chars that is not fixed can also be :
file1:
hello1
hello2
hello3_B,AAAtest1,N

or
file2:
hello1
hello2
hello3_B,AAAtest2V,N

or
...

My file is :

hello1
hello2
hello3_B,AAAdummy,N

How to replace the third line dummy in the file to the below

hello1
hello2
hello3_B,AAAdummyA,N

Anyone can help.Thanks.

my file is :

hello1
hello2
hello3_B,dummy,N

Need to change to :

hello1
hello2
hello3_B,dummy_01,N

Can anyone help? Thank you.

Please use code tags...

My file looks like this and i need to only extract those with PDT_AP21_B and output it to another file. Can anyone help? Thanks.


PDT_AP21_R,,, 11 ...