isr.co.ro : glossary chmod The Unix command you use to set who can read, write, or execute a file, as well as several more technical parameters. If you're setting up an Internet server or installing a Unix-based client program, you'll need to use this command to make various files executable. If the program doesn't come with explicit instructions about which parameters to use, you may need to brush up on older technology: Most versions of chmod still use octal (base 8) numbers. As usual for Unix commands, you can find the details with the man command; just type man chmod at a prompt.