What does chmod 640 do? Using Binary References to Set permissions
A sample permission string would be chmod 640 file1, which means that the owner has read and write permissions, the group has read permissions, and all other user have no rights to the file.
What does chmod 664 do? chmod 664 is equivalent to only owner and his group members can write, others are only allowed to read. chmod 644 means only the owner are allowed to write/modify, read-only for others (group) included. There is no number 7 or 5 in the chmod number, which means no one are allowed to execute the file.
What does chmod 744 mean in Unix? chmod 744 file1. sets read, write and execute for the owner and read only for the group and all others. chmod 777 file1. sets read, write and execute for everyone.
What does chmod 740 mean? Using this table, we can see that chmod 740 means the resulting permissions are going to be rwx, then r–, then —, or rwxr—–, meaning full permissions for the owner, read-only for the group, and nothing for the other users.