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Most usage is centered around a dozen or so commands:
| ls, more, less, cat, nano, pwd, cd, man, bsub, bkill, bjobs, ps, scp, ssh, cp, chmod, rm, mkdir, passwd, history, zip, unzip, tar, df, du, head, tail, grep |
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See the man pages for complete documentation. Here is a short description of some.
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What text editors are available?
| nano, nedit, vi, vim, emacs |
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How do I strip out ^M embedded characters in my files I transferred from my PC?
Use the dos2unix command on the file. There is man page documentation available for further info. Also check this page for additional tips.
> man dos2unix
What is a man page?
man pages are linux/unix style text based documentation. For example, to obtain documentation on the command cat:
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How can I verify that my requested storage is mounted?
Use the df command.
How can I view my most recent files?
> ls -lt
I sometime notice that my job duration can vary when I rerun a program with exactly the same inputs, condition, etc... Why?
The cluster has a mix of several different Intel CPUs and motherboard combinations. The absolute performance potential is similar among them but given the mix of other jobs sharing nodes, your results will vary. This is not something that is predictable when the cluster is well loaded.
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Issue the following in the directory of interest:
| > find . -name "A-Z" | cut -c 3- - | awk '{print $1,tolower($1)}' | xargs -i echo "mv {}" | csh |
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This will find everything with uppercase letters and rename it to the
same thing with all lowercase.
How do I uncompress and extract many .gz and corresponding tar files?
| > ls -1 *.gz | xargs -n 1 -r -I {} tar zxf {} |
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Sometimes I get a cryptic message about too many open files, what is that?
There are several resource settings associated with a default account. To see the settings:
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It is best not to ssh into the cluster while you are on the login node of the cluster.
I compiled a program locally in my account and I would like to add the location of the executables to my PATH, how do I do this?
Suppose your software directory is located in you home directory and your username is jdoe02. Your software directory is flight_program/ and there is a bin subdirectory located within containing executables.
$PATH is a global environmental variable defined for the cluster for general access to important locations. You may add to it by pre-pending the path you wish to be searched.
PATH=/cluster/home/j/d/jdoe02/flight_program/bin:$PATH export PATH |
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To see if it got updated:
| > printenv | grep PATH |
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