- The department is a major sponsor of the school's high-performance Linux
computing cluster, which
contains more than 100 nodes (390 CPUs) as of July 2009. This resource is
the major research computing capability available to the department, and is
the appropriate tool for heavy-duty research computing. Department members
can request an account by contacting Oliver Hofmann.
The School (HSPH) runs a Sun server known as hsph. hsph can
be accessed through all PC's in the department via an X-Window emulation software
(Xmanager). All major mathematical and statistical software needed in the
coursework is installed on hsph. In the past, hsph has acted
as the mail server for the School, which has limited its usefulness for research
on it. As of fall 2006, this is ending, and the server may be useful for research.
Unix password is at the same time your e-mail password. The same rules apply
to choosing a good password as in the PC section of this document. The "passwd"
command is used to change your password.
- Disk space
Each student in biostatistics is assigned 100MB of disk space on hsph,
while postdocs are assigned 300Mb. Faculty members should discuss their needs
with Bill Mahoney in the IT department. The "quota -v" command will give you
the current usage of the disk space. The "du" program will also show you the
disk space utilization of the current directory and its subdirectories. In
order to make the most use of the disk space ``gzip'' is the recommended tool
to compress the files.
gzip file will create a compressed file
file.gz In order to recover the original file, use the command
Research students (3rd year and above),
with the permission of their advisor, can obtain additional disk space through
Bill Mahoney in IT (bill@hsph).
- File permissions
By default, files that you create on hsph are readable only by you.
You can use the "umask" command in your .cshrc file to change the default
creation mask for new files and directories, and the "chmod" command to modify
the protections on particular files or directories. A "umask 22" in your .cshrc
file will allow the access to your newly created files and directories for
everybody. "chmod 700 directoryname" will turn off all access bits for an
existing directory. "chmod 755 directoryname" will enable access for a directory,
and "chmod 644 filename" will allow access for a particular file. See "man
chmod" for details.
- Online documentation
The "man" command is the main source of online documentation. Running the
command "man date" will provide information on the "date" command, and "man
-k date" will lookup any references to commands which include the string "date"
in their terse description.
This page is maintained by
The User Assistants
Last updated: 07/28/2009