How can I check if a file can be created in bash?

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The user calls my script with a file path that will be created at some point in the script, like foo.sh file.txt or foo.sh dir/file.txt.



Before I get into the guts of the script, I want to make a reasonable check if the file can be created, but not actually create it. This check doesn't have to be perfect, and yes I realize that the situation can change between the check and the point where the file is actually written - but here I'm OK with a best effort type solution so I can bail out early in the case that the file path is invalid.



Examples of reasons the file couldn't created:



  • the file contains a directory component, like dir/file.txt but the directory dir doesn't exist

  • the user doens't have write permissions in the specified directory (or the CWD if no directory was specified





bash files error-handling






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    The user calls my script with a file path that will be created at some point in the script, like foo.sh file.txt or foo.sh dir/file.txt.



    Before I get into the guts of the script, I want to make a reasonable check if the file can be created, but not actually create it. This check doesn't have to be perfect, and yes I realize that the situation can change between the check and the point where the file is actually written - but here I'm OK with a best effort type solution so I can bail out early in the case that the file path is invalid.



    Examples of reasons the file couldn't created:



    • the file contains a directory component, like dir/file.txt but the directory dir doesn't exist

    • the user doens't have write permissions in the specified directory (or the CWD if no directory was specified





    bash files error-handling






    share























      up vote
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      down vote

      favorite









      up vote
      0
      down vote

      favorite











      The user calls my script with a file path that will be created at some point in the script, like foo.sh file.txt or foo.sh dir/file.txt.



      Before I get into the guts of the script, I want to make a reasonable check if the file can be created, but not actually create it. This check doesn't have to be perfect, and yes I realize that the situation can change between the check and the point where the file is actually written - but here I'm OK with a best effort type solution so I can bail out early in the case that the file path is invalid.



      Examples of reasons the file couldn't created:



      • the file contains a directory component, like dir/file.txt but the directory dir doesn't exist

      • the user doens't have write permissions in the specified directory (or the CWD if no directory was specified





      bash files error-handling






      share













      The user calls my script with a file path that will be created at some point in the script, like foo.sh file.txt or foo.sh dir/file.txt.



      Before I get into the guts of the script, I want to make a reasonable check if the file can be created, but not actually create it. This check doesn't have to be perfect, and yes I realize that the situation can change between the check and the point where the file is actually written - but here I'm OK with a best effort type solution so I can bail out early in the case that the file path is invalid.



      Examples of reasons the file couldn't created:



      • the file contains a directory component, like dir/file.txt but the directory dir doesn't exist

      • the user doens't have write permissions in the specified directory (or the CWD if no directory was specified





      bash files error-handling




      bash files error-handling





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