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hasanghaforian
Asked: 2018-04-29 10:53:31 +0800 CST

Find all files with specific mime type

  • 772

I copied huge number of (Android SDK) files from a shared directory to my system. Now all files which their MIME types are application/x-shellscript or application/x-executable, seems that are not executable. For example when I try to run mksdcard I get this error:

$ ./mksdcard
bash: ./mksdcard: Permission denied

How I can find only files with those MIME types? And then how I can change those permissions?

Notes:

1- When I tried find <path> -type f -executable with as root user it shows all files (even .PNG files) and when I tried that with standard user, it shows nothing. I do not know how to filter files with attention to their MIME type.

2- Share directory (source) currently is not accessible.

permissions find 16.04

2 Answers

  1. Best Answer

    The find command doesn't test mimetype itself, but you can use it to execute the mimetype command and grep the result.

    For example 

    find path/to/dir/ -type f -exec sh -c '
  for f; do 
    mimetype -b "$f" | grep -Eq "application/(x-shellscript|executable)" && 
    printf "%s\n" "$f"
  done
' sh {} +

    To perform some operation on the matching files (such as a chmod or chown), replace the printf command with that e.g.

    find path/to/dir/ -type f -exec sh -c '
  for f; do 
    mimetype -b "$f" | grep -Eq "application/(x-shellscript|executable)" && 
    chmod u+x "$f"
  done
' sh {} +

    I highly recommend checking the current ownership and permissions first e.g. with ls

    find path/to/dir/ -type f -exec sh -c '
  for f; do 
    mimetype -b "$f" | grep -Eq "application/(x-shellscript|executable)" && 
    ls -l "$f"
  done
' sh {} +
    • 8

  2. Hint:

    man cp

    Then press / and enter attr (part of 'attributes') and press ENTER.
    Now, read the portions of the text that got marked.
    Hitting n or p will make the display jump to 'n'ext or 'p'revious instance.

    Attempt to explain:

    Assuming that you still have the original files available you may restore the file attributes of your copied files by use of this argument to 'cp' (copy), together with your originial arguments.

      
       --attributes-only
              don't copy the file data, just the attributes

    If I'm not entirely mistaken you will get the settings for all the mentioned files corrected by this.

    • 1