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NUIT >
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How To Share Files Within the SSCC
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How To Share Files Within the SSCCOverviewThe Social Sciences Computing Cluster serves many people in one computing environment. It's only natural that you might want to share access to your files, either for instruction, research collaboration or research publication (within the cluster). This document describes how to set up a subdirectory tree of files for other users to be able to read only. Sharing A Subdirectory of Files Read-OnlyLogin to your SSCC account, and make sure that you're in your HOME directory by typing the command cd with no other arguments: [abc123@hardin ~]$ cd Now give your HOME directory the minimum group access rights to allow other SSCC users to access your subdirectory thru your HOME directory. Give your HOME directory group search access only: [abc123@hardin ~]$ chmod g=x $HOME Create the subdirectory you will share files from: [abc123@hardin ~]$ mkdir Labor Give the Labor directory read and search access: [abc123@hardin ~]$ chmod g=rx Labor Having done this, other SSCC users can list the names of the files in your Labor directory if they know the path to that directory: ~abc123/Labor Put the files you want to share in your Labor subdirectory. You can include subdirectories as well, just make sure that each subdirectory you create is given the same g=rx access permissions. Now, give all of the files in the Labor directory tree group read access: [abc123@hardin ~]$ chmod -R g+r Labor Finally, have someone check your work from another account by trying this ls command (showing example output below): [xyz987@seldon ~]$ ls -lR ~abc123/Labor | more
/sscc/home/a/abc123/Labor:
That command should list the entire directory tree of files and subdirectories within your Labor directory without any access error messages. That proves that others can get to your files. Then have that other user verify that others have read access to all of your files with this find command (with example results below): [xyz987@seldon ~]$ find ~abc123/Labor -type f -exec file '{}' ';'
This complicated find command executes the command file on every file (-type f) in your ~abc123/Labor directory tree. The file command reads the first few bytes of each file to determine the type of file it is, thereby verifying that other users have read access to your files. Make sure that you enter -type f -exec file '{}' ';' exactly as you see it, spaces included. Change ~abc123/Labor to the path to your own home directory and directory to be shared. NotesNever share files from your HOME directory. Always create a subdirectory from which to share files. The approach given here only facilitates sharing files with other SSCC users who are running jobs on SSCC hosts. Other SSCC users cannot list the names of the files in your HOME directory. They must specify the complete path to the directory being shared before they can list the files in that directory. If you wish to share executable programs or shell scripts, give those files g=rx permission. If you put new files or directories into your shared directory, you must make sure they have the proper group access permissions.They will not inherit the permissions of other files in your shared directory. You should explicity redo the steps outlined above to ensure that others can share your files. |
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