Awk - Append the output file and rename the input and output file -


I am trying to keep files updated in lines with file lines starting from 99 to 99. Do I need to create a new file4 every time what any way to attach to the file all the time is awk?

I also see file 3 to rename file 3.orig, after the file is processed and file4 to file3.txt (original name input file). Then File4 will become File3 after processing and File3 file will become 3.orig.

Any help is appreciated. I am using the following script.

Script 

  awk -F '\ t', '/ ^ 99 /' File3.txt & gt; File4.txt

to add & gt; & Gt; Use in an existing file:

# ve-- Here's azak / / 99 / 'File3.txt & gt; & Gt; File4.txt

If the file does not exist, and if so, it will be added. File shuffle is best done later: 

  mv file3.txt file3.orig mv file4.txt file3.txt

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