<ul> <li>Error message:<br /> p4_error: semget failed for setnum: 0<br /> This means that the maximum number of allowed semaphores on the master node has been created, and the program you are trying to run cannot allocate a new semaphore for inter-process communication. This can happen when somebody has been testing software that does not exit properly, leaving semaphores and shared memory segments allocated.<br /> If the leftover semaphores are owned by you, it can be fixed by running the following two commands:<br /> <strong>Run on each machine: <em>/opt/mpich/gnu/sbin/cleanipcs</em></strong><br /> <strong>Run on the cluster root: <em>cluster-fork /opt/mpich/gnu/sbin/cleanipcs</em></strong></li> </ul>
<strong>!! - </strong>This will execute the last command from history file.<br /> <strong>!<char> </strong>- This will execute the last command from history, starting with <char><br /> <br />
<ul><li><strong>du -Lk <path>: </strong>This will give the disk usage statistics for the path.</li><li><strong> rpm -i mpi*rpm:</strong> This will install the given RPM file.</li><li><strong> /etc/init.d/iptables status:</strong> This will give the status of the iptables in the system.</li><li><strong> /opt/rocks/sbin/create-account -c "Asif Rahaman " -d /export/home/weland/rahaman -g 380 -s /bin/bash -u 24855 rahaman: </strong>Create an account in Rocks for user Asif Rahaman and given directory.</li><li><strong>cluster-fork <cmd>: </strong>Runs the command in every system on the cluster.</li><li><strong> diff <file1> <file2>: </strong>Finds and lists the difference between the files.</li><li><strong>scp chaffin@antaeus.hpcc.ttu.eduhome/chaffin/bash-test .:</strong> Secure Copy from one remote location to another.</li><li><strong>find . -name "chaffin" -print: </strong>Used to find the file with name chaffin.</li><li><strong>rsync --archive --rsh=/usr/bin/ssh ./post hrothgar.hpcc.ttu.edu:/home/chaffin/post: </strong>Move the archive post to another system hrothgar.</li>
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