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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minute“Never execute bit” is not the name of one special Unix permission. It usually means that execute permission is absent, but the permission is set separately for the owner, group, and other users. On a regular file, x allows execution; on a directory, it allows searching or traversing the directory.
What the execute permission means
GNU Coreutils defines x as permission “to execute the file, or search it if it is a directory.” See Setting Permissions (GNU Coreutils 9.11).
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On a regular file
The execute permission allows a user in the relevant permission class to run the file as a program. A file can be executable for one class and not another.
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On a directory
The execute permission allows searching or traversing the directory—for example, accessing names within it. It does not run the directory as a program, and it does not grant execute permission on files inside it. Each contained file has its own permissions. Directory read permission and search permission are distinct: being able to list names does not by itself mean a user can access those names.
There is no single execute bit for everyone
Ordinary Unix permissions provide separate read, write, and execute/search permissions for three classes: owner, group, and other. A mode display shows these nine permission positions after the leading file-type character. For example, -rw-r--r-- has no execute permission in any class; -rwxr-xr-x has it for all three. The leading character identifies the object type, not an additional permission position. The Linux chmod(1) manual describes the conventional permission representation.
In octal notation, read, write, and execute have values 4, 2, and 1 within each class digit. Thus 644 means owner read/write, group read, and other read, with no execute permission in any class. 755 includes execute permission for owner, group, and other.
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How to remove execute permission
On GNU/Linux, these commands illustrate two different ways to change a regular file’s mode:
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The first command makes a relative change; the second sets the ordinary permission mode explicitly. Use the first when the aim is only to remove execute permission without altering existing read or write bits. The GNU Coreutils chmod documentation explains symbolic and numeric modes.
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Changing a mode requires owning the file or having appropriate privilege. Symlinks have special handling: GNU documentation says that changing a named symlink generally affects its referent, while recursive traversal ignores encountered symlinks by default. The cited documentation describes GNU behavior; it does not establish a universal rule for every Unix-like system or configuration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What “no execute” does—and does not—establish
If someone says a file has “never execute bit,” the precise interpretation depends on scope. They may mean execute permission is disabled for owner, group, and other, or that it is disabled only for a particular class. A clearer description names the object and classes—for example, “this regular file has no execute permission for any class.”
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Mode bits are only one part of access control. The references here explain conventional permissions and chmod; they do not establish how every filesystem, access-control list (ACL), mount option, or security policy affects access on every Unix-like system. For a standards-oriented reference to chmod, see the POSIX Programmer’s Manual.
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