13. Permissions for files (example) To see the permissions on a file, do a ‘ ls –l ’ attu4:/u15/awong$ ls –l -r--r--r-- 1 awong ugrad_ce 17375 Apr 26 2000 rgb.txt -rw-r--r-- 1 awong ugrad_ce 17375 Apr 5 02:57 set10.csv drwxr-xr-- 1 awong ugrad_ce 1024 Jan 19 19:39 tests Changing Permissions chmod [ugo]+[rxw] <filename> e.g. chmod u+w rgb.txt  gives me permission to change rgb.txt Changing Ownership chown <user>.<group> <filename> e.g. chmod awong.iuns rgb.txt  iuns group now owns rgb.txt Note: You cannot change which user owns file, unless you are an administrator, for security reasons.