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Tools: How to Read and Set Linux Permissions

2026-03-15 0 views admin
Tools: How to Read and Set Linux Permissions

Overview

How to Read Permissions

File Types

Types of Permissions

For Files

For Directories

Example

How to Set Permissions

Specifying Numerically

Specifying Alphabetically

Target

Method

Content

References

Additional Notes This post summarizes Linux permissions. The first character represents the file type. Subsequent characters, in groups of three, represent permissions for different owners of the file. 2~4th characters: User permissions for the file owner

5~7th characters: Group permissions for the owning group8~10th characters: Other permissions There are three types of permissions: r Readw Writex Execute The meaning changes depending on whether it's a file or a directory. r Read: Can read the file contentsw Write: Can edit the file contentsx Execute: Can execute the file as a program r Read: Can display the list of files under the directoryw Write: Can create or delete files under the directory※1x Execute: Can move into the directory※2 ※1 Files under the directory can be deleted even without write permission※2 If execute permission is not granted to the directory, you cannot move into it Permissions for hoge.md File type: FileUser permissions: Read/WriteGroup permissions: ReadOther permissions: Read Permissions can be specified numerically or alphabetically. Use the chmod command to set permissions. chmod mode target_filename Use three digits to specify permissions. The hundreds place is for the user, the tens place is for the group, and the ones place is for others. 4 r Read2 w Write1 x Execute To grant multiple permissions, specify the sum of the numbers. For example, to grant read and write permissions, specify 6; to grant all permissions, specify 7. chmod target+method+content target_file Specify the target, method, and content using alphabets and symbols. u Userg Groupo Othersa All Multiple targets can be specified. For example, to target both user and group, specify ug. = Set specified permissions r Readw Write

x Execute Multiple contents can be specified. For example, to specify read and write, specify rw. The number 1 displayed next to the permissions in the output of ls -l represents the number of hard links. Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to ? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse

Code Block

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ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md chmod 766 hoge.md -rwxrw-rw- 1 bmf staff 1788 Jul 18 11:57 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md chmod 766 hoge.md -rwxrw-rw- 1 bmf staff 1788 Jul 18 11:57 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md chmod 766 hoge.md -rwxrw-rw- 1 bmf staff 1788 Jul 18 11:57 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md chmod a+rw hoge.md -rw-rw-rw- 1 k.takeuchi staff 2877 Jul 18 12:24 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md chmod a+rw hoge.md -rw-rw-rw- 1 k.takeuchi staff 2877 Jul 18 12:24 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md chmod a+rw hoge.md -rw-rw-rw- 1 k.takeuchi staff 2877 Jul 18 12:24 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md ls -l hoge.md -rw-r--r-- 1 bmf staff 652 Jul 18 11:45 hoge.md - File d Directory l Symbolic link - Add specified permissions - Remove specified permissions - Checking and Changing Linux Permissions - Linux File Management: Setting Permissions

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toolsutilitiessecurity toolslinuxpermissionsoverviewdirectoriesexample

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