Deck 3 - PERMISSIONS & OWNERSHIP
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Last updated 12:53 PM on 4/8/26
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19 Terms
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Permissions
Rules that define who can read, write, or execute a file
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Owner
The user who created the file and controls permissions
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Group
A collection of users who share access to files
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Others
All users who are not the owner or group
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Read (r)
Permission to view file contents
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Write (w)
Permission to modify a file
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Execute (x)
Permission to run a file or access a directory
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chmod
Command used to change file permissions
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chown
Command used to change file ownership
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chgrp
Command used to change group ownership
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Numeric Permissions
A system where permissions are represented using numbers (4=read, 2=write, 1=execute)
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umask
A value that removes permissions to determine default permissions
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Default Permissions
Permissions automatically assigned to new files and directories
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SUID
A permission that allows a file to run with the owner's privileges
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SGID
A permission that makes files inherit the directory's group
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Sticky Bit
A permission that allows only the owner to delete files
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Immutable Flag
An attribute that prevents a file from being modified or deleted