If you see no response, the command ran successfully and the permissions have been changed chmod ux versus chmod x comparison A huge number of tutorials on the internet use chmod ux in their tutorials for demonstration purpose If you actually run chmod ux and compare with chmod x, you should see no difference in most cases The man page of chmod u=rwx,g=rwx,o=rwx chmod u=rwx,g=rx,o=rx chmod u=rw,g=r,o=r When two fields are the same, you can combine them The last chmod would be the same as chmod u=rw,go=r And you can use a (all) to assign to u,g and o at once, so the first is equivalent to chmod a=rwx Now, there are a few special permission bits s (setuid/setgid) and tImagine you've got a bunch of boxes, each box indicating a different sort of permission, and you want to set certain ones on, and others off You can use a number as a pattern The numbers in chmod tell the computer which ones to check off Let's Unix Permissions Linux chmod numbers
