What are some examples of using chmod in Linux?

What are some examples of using chmod in Linux?

The chmod command in Linux is used to change the file permissions. Here are a few examples:

1. chmod 755 filename - This sets the permissions to read, write, and execute for the owner, and read and execute for the group and others.
2. chmod 644 filename - This allows the owner to read and write, while the group and others can only read.
3. chmod +x script.sh - This adds execute permission to the script for all users.

Can you explain what the numbers mean in chmod?

Sure! The numbers in chmod represent different permissions:

• 4 = read (r)
• 2 = write (w)
• 1 = execute (x) You add these numbers together for each user category: owner, group, and others. For example, 755 means:
• Owner: 7 (4+2+1) - read, write, execute
• Group: 5 (4+1) - read, execute
• Others: 5 (4+1) - read, execute.

What if I want to remove permissions?

You can remove permissions using the - sign. For example:

• chmod 644 filename removes execute permission for the owner, group, and others.
• chmod -x script.sh removes execute permission from the script for all users.

Are there any symbolic ways to use chmod?

Yes! You can use symbolic notation with chmod. For example:

• chmod u+x filename adds execute permission for the user (owner).
• chmod g-w filename removes write permission from the group.
• chmod o=r filename sets the permissions for others to read only.