Know How to Use the chmod Command on Linux in Two Minutes

1. Understand permissions
1. how to check ($ls -l)
2. file (-)
3. dir (d)
4. read (r)
5. write (w)
6. execute (x)
2. User types
1. user (u)/group (g)/other (o)
3. Understand operations
1. + (add)
2. - (remove)
3. = (set equal)
4. Numerical shorthand
• The digits you can use and what they represent are listed here:
• 0: (000) No permission.
1: (001) Execute permission.
2: (010) Write permission.
3: (011) Write and execute permissions.
4: (100) Read permission.
5: (101) Read and execute permissions.
6: (110) Read and write permissions.
7: (111) Read, write, and execute permissions.
5. Recursive (-R)
• If we had wanted to include files in subdirectories, we could have used the -R (recursive) option.
6. Examples
• $ls -l
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• $chmod 777 chmod_test.txt
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• $chmod u-x chmod_test.txt
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