A short companion for chmod Calculator: when it is useful, what it expects, and what to check before using the result.
What it does
Convert between octal permissions and symbolic ones, toggling read, write and execute for owner, group and others. It shows the resulting chmod command and the rwxr-xr-x string side by side, so you can check one against the other before running anything.
Use the tool
Open chmod Calculator, add the input the tool asks for, run it, and check the output before using it elsewhere.
Input and output
- Input: text.
- Output: text.
- Category: Workflow.
Privacy and processing
Processing happens locally in your browser. This tool does not upload the input to ilham.dev.
Questions
What is the difference between 644 and 755?
644 gives the owner read and write and everyone else read, which is the normal choice for files. 755 adds execute for everyone, which is what directories and scripts need.
What does a leading digit mean?
It carries the setuid, setgid and sticky bits — 1777 for a shared directory like /tmp, for example.
Related guide
For broader background, see Linux Command Line Tasks Without Surprises.