Calculate File Permissions with Ease using chmod
Productivity Sauce
I don't know about you, but I often have problems calculating file permissions (probably because I don't do this very often). That's why I find the chmod app for Android rather handy.
This app does only one thing: it calculates the correct number combination for specific file permissions. You can use it for the exact opposite, too: enter the desired combination and you should see the corresponding file permissions. The app is free and it weighs only 45Kb.
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chmod app