Why is it that both users below have the same umask but when they make a file they get different permissions. check it out below. Thanks in advance....
millsm@ngbva (/home/millsm)$umask 022 millsm@ngbva (/home/millsm)$umask -S u=rwx,g=rx,o=rx millsm@ngbva (/home/millsm)$> test millsm@ngbva (/home/millsm)$ll test -rw-rw-r-- 1 comp comp 0 Mar 7 14:32 test
comp@ngbva (/comp)$umask -S u=rwx,g=rx,o=rx comp@ngbva (/comp)$umask 022 comp@ngbva (/comp)$> test comp@ngbva (/comp)$ll test -rw-r--r-- 1 comp comp 0 Mar 7 14:20 test
This could easily be explained if your file already existed. The redirection simply truncates (sets the file's end-of-file pointer) to the beginning but does nothing to the permissions.
Consider:
# cd /tmp # umask 022 # touch me # ls -l me -rw-r--r-- 1 root sys 0 Mar 7 14:44 me # chmod 664 me # ls -l me -rw-rw-r-- 1 root sys 0 Mar 7 14:44 me # > me # ls -l me -rw-rw-r-- 1 root sys 0 Mar 7 14:45 me
"The difference between me and you? I will read the man page." and "Respect the hat." and "You could just do a search on ITRC, you don't need to start a thread on a topic that's been answered 100 times already." Oh, and "What. no points???"
> if you write over a file it gets differnt permissions... this is crazy... why?
The redirection operator ('>') _truncates_ and existing file. That is, the file's end-of-file pointer is set to offset-0 (as if nothing had been written). The existing file is not removed and hence no permission bits are setup as when a file is created.
