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This repository was archived by the owner on Dec 22, 2023. It is now read-only.

Commit 2b8893f

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Merge pull request #571 from schezfaz/chmod_simplifier
Python script to convert Chmod permission to Symbolic/Numerical notations
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## Python CHMOD Simplifier
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### What is CHMOD?
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'CHMOD' is a command used in Unix based systems that is used to change access permissions of files and directories. It is an abbreviation for 'Change Mode.'
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The CHMOD numerical format is composed of 3 digits, each ranging between 0 and 7. From left to right, each digit represents the corresponding permissions for _user_, _group_ and _other_ respectively.
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Each of these digits represents a binary value which controls the _read_, _write_ and _execute_ permissions pertaining to that group. A value of 1 indicates that the corresponding group is allowed an action, where as 0 indicates that the action is not allowed.
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Thus, each digit can be represented as r (read), w (write) and x (execute) symbolically based on the binary value of the indicating digit.
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For example, the chmod permission 755 can we interpreted as follows:
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| NUMBER | CLASS | BINARY | PERMISSION | rwx |
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|--------|--------|--------|----------------------|-----|
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| 7 | USER | 111 | read, write, execute | rwx |
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| 5 | GROUP | 101 | read, execute | r-x |
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| 5 | OTHERS | 101 | read, execute | r-x |
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Thus, 755 in the numerical format would translate to rwxr-xr-x.
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### This script converts symbolic representation of CHMOD permissions to it's numerical equivalent, and the Numerical representation of CHMOD permissions to its Symbolic equivalent as well.
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Example (numerical to symbolic representation):
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input: 777
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output: rwxrwxrwx
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![Symbolic Representation](./SymbolicNotation.PNG)
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[Symbolic Representation](./SymbolicNotation.PNG)
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Example (symbolic to numerical representation):
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input: rwxrwxrwx
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output: 777
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![Numerical Representation](./NumericalNotation.PNG)
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[Numerical Representation](./NumericalNotation.PNG)
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### How to use this script?
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1. The script has 2 options:
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- Symbolic to Numerical (N)
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- Numerical to Symbolic (S)
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Pass the desired mode of conversion while executing the script
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2. Run the following command:
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python chmod_simplifier.py <representation> <mode>
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Replace:
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- <representation> with 777 or rwxrwxrwx based on your preferred mode of conversion
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- <mode> with either 'S' or 'N' as per the desired mode
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3. View output on console
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### Author
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[Schezeen Fazulbhoy](https://github.com/schezfaz)
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import sys
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notation = {
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'---': '0',
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'--x': '1',
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'-w-': '2',
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'-wx': '3',
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'r--': '4',
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'r-x': '5',
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'rw-': '6',
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'rwx': '7'
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}
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def symb_to_num(symbolic):
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'''
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Convert symbolic permission notation to numeric notation.
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'''
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if len(symbolic) == 9:
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group = (symbolic[:-6], symbolic[3:-3], symbolic[6:])
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try:
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numeric = notation[group[0]] + notation[group[1]] + notation[group[2]]
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except:
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numeric = "Invalid Symbolic Representation!"
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else:
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numeric = "Symbolic input should be of lengh 9!"
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return numeric
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def num_to_symb(num):
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'''
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Convert number permission notation to symbolic notation.
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'''
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num = str(num)
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if len(num) == 3:
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group = (num[0], num[1], num[2])
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symbolic = ""
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for key, value in notation.items():
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for g in group:
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if int(g) > 8 or int(g) < 0:
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symbolic = "Invalid Numerical Representation!"
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elif g == value:
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symbolic = symbolic + key
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else:
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symbolic = "Number input should be of length 3!"
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return symbolic
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def main():
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representation = sys.argv[1]
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mode = sys.argv[2]
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if mode == 'S':
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print(num_to_symb(representation))
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elif mode == 'N':
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print(symb_to_num(representation))
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else:
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print("Invalid Mode Selection. Please select 'S' for numerical --> symbolic conversion or 'N' for symbolic --> numerical conversion!")
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if __name__ == "__main__":
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main()

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