Further:
[root@andromeda ~]# touch /tmp/foo
[root@andromeda ~]# chmod 0444 /tmp/foo
[root@andromeda ~]# ls -l /tmp/foo
-r--r--r--. 1 root root 0 Jan 31 00:17 /tmp/foo
[root@andromeda ~]# echo hello >/tmp/foo
[root@andromeda ~]# ls -l /tmp/foo
-r--r--r--. 1 root root 6 Jan 31 00:17 /tmp/foo
[root@andromeda ~]#
But:
[root@andromeda ~]# su - dhowells
[dhowells@andromeda ~]$ touch /tmp/bar
[dhowells@andromeda ~]$ chmod 0444 /tmp/bar
[dhowells@andromeda ~]$ ls -l /tmp/bar
-r--r--r--. 1 dhowells dhowells 0 Jan 31 00:19 /tmp/bar
[dhowells@andromeda ~]$ echo hello >/tmp/bar
-bash: /tmp/bar: Permission denied
David
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