A utility to append content into a file, if this content isn't already in the file (even in part)

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Is there a *Nix utility by which I could append content to a file (say, append the content of a template file into the end of a second file), only if the content isn't already available in the second file, partially or fully?



One could use this grep solution but I find the code there a bit complicated at the moment and would prefer a dedicated utility if there is one.







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    Is there a *Nix utility by which I could append content to a file (say, append the content of a template file into the end of a second file), only if the content isn't already available in the second file, partially or fully?



    One could use this grep solution but I find the code there a bit complicated at the moment and would prefer a dedicated utility if there is one.







    share|improve this question























      up vote
      1
      down vote

      favorite
      1









      up vote
      1
      down vote

      favorite
      1






      1





      Is there a *Nix utility by which I could append content to a file (say, append the content of a template file into the end of a second file), only if the content isn't already available in the second file, partially or fully?



      One could use this grep solution but I find the code there a bit complicated at the moment and would prefer a dedicated utility if there is one.







      share|improve this question













      Is there a *Nix utility by which I could append content to a file (say, append the content of a template file into the end of a second file), only if the content isn't already available in the second file, partially or fully?



      One could use this grep solution but I find the code there a bit complicated at the moment and would prefer a dedicated utility if there is one.









      share|improve this question












      share|improve this question




      share|improve this question








      edited Jun 14 at 9:17
























      asked Jun 14 at 4:57









      user9303970

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