This page describes the filesystem structure on the SCC as well as commands for basic navigation and file manipulation on the system. We also have a Getting Started Reference Sheet (PDF) which we recommend you print out, look over, and keep available as a reference. This has a variety of information that will likely be useful to all new SCC users, whether experienced with Linux or not. More detailed information about the cluster is available on our System Usage page.
The Linux filesystem starts at the “root” (/) and extends forward into directories that can contain both subdirectories and files. A series of decending directories can be strung together separated by slash characters (“/”) to indicate a location on the filesystem. This string of folders is called a “path” and will look like
/project/projectname/subfolder/file. This structure is much like that on other common operating systems. More detailed information about the filesystem on the SCC can be found here, but an overview of the most common locations is detailed below.
||Each user has a “home directory,” this is the directory you are put in when you first log in each session.|
||Backed up Project Disk Space is backed up to another location each night.|
||Not backed up (“nb”) Project Disk Space.|
/projectnb/shares are located in
Working with Files/Directories
Below are some simple examples of basic Linux commands for accessing and changing your files and directories. For all of these commands, you can run
man command_name to see the manual page (system documentation) on the command, including explanation of available command line options.
- Show the current “full path”, the directory you are in with its parent and all levels of grandparents up to the root directory (/):
scc1% pwd /usr2/collab/adftest2
- Create a file:
scc1% touch myfileThis command will create a blank file named
myfile. You will also want to be able to use an editor to create or modify an existing text file. A simple graphical editor to use is
gedit, but more complex editors like
viare also available.
- Create a new directory:
scc1% mkdir newdir
- List the files, including other directories, in the current directory:
scc1% ls newdir newdir
There are many options to the
lscommand such as
ls -lto list the files in the current directory in “long” (verbose) format such as:
scc1% ls -l newdir total 0 drwxr-xr-x 3 adftest2 adftest 512 Oct 28 16:03 newdir
The letters on the left (“drwxr-xr-x”) indicate the “permissions” of this file/directory. The “d” indicates that it is a directory. The next 9 characters indicate that is is “readable”, “writable”, and “executable” by you and “readable” and “executable” by both the members of your project group and the world. The commands you can use to change these “permissions” are chmod and umask.
- Move and/or rename a File
scc1% mv myfile newdir/newfilename
This command will move the file
myfileinto the directory
newdirand simultaneously rename it to be called
- Move to a different directory:
scc1% cd newdir
Move to the newly created
newdirdirectory. You can also specify a “full path” (a path that starts with a /) such as
cd /usr/local/bin. Typing just
cd .) by itself will always take you to your home directory.
- Copy a file
scc1% cp newfilename filecopy
This command will make a copy of
newfilenamein the file
filecopy. You can copy entire directories by using the
- Delete a file
scc1% rm filecopy rm: remove regular empty file `filecopy'? y
By default you will be asked to confirm that you want to remove a file by typing y when asked. You could avoid this by using the command line option
-fbut then you must be much more careful. Empty directories are removed using the command
rmdir directory_name. Full directories can be removed by again using the
-r(recursive) option to