2755 permission

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The first digit of a 4-character permission (in this case, the "2") specifies the setuid mode (=4), the setgid mode (=2), and the sticky mode (=1). These values are added together in a manner identical to the read/write/executable permissions above. More information is here.

It should be noted that the setgid mode and the sticky mode have special meanings for directories.

Thus a permission of "2755" for a directory means that everyone has read and execute permission, while the file owner and members of the file's group additionally have write permission. And any files or subdirectories created in that directory will inherit the parent directory's group id.

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