...
It can also be given a script containing any number of commands that will be executed sequentially.
Exercises
Exercise 1 - create a delegate and check that pshell is using it.
Perform the following:
- run pshell and log in using your Pawsey credentials
- create a delegate
- exit and restart pshell
- check your identity
| Warning |
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You will only be able to do this exercise if you've logged in with a Pawsey user account. Delegate identities are not allowed to create further delegates. |
Exercise 2 - running commands from the shell
Perform the following:
run pshell from your command prompt
login| Expand |
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sean
????
delegate
exit
pshell whoami
Exercise | title | Solution to exercise 2 |
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|
| Code Block |
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iblis:~> pshell "ls /projects/Data Team/testfiles"
Reading config [/Users/sean/.mf_config]
31 items, 29 items per page, remote folder: /projects/Data Team/testfiles
69776098 | online | 17 KB | i000769.jpg
69776099 | online | 17.02 KB | i000765.jpg
69776100 | online | 17.69 KB | i000771.jpg
69776101 | online | 17.21 KB | i000767.jpg
etc |
|
Exercise 3 - script a task to download a file in your directory.
Perform the following:
- create a text file to change into the Demo/<yourname> directory and download a file
- use this script as input to pshell
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Create a plain text file script1.txt containing: | Code Block |
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cd Demo/sean
get testfile1 |
Then do: | Code Block |
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iblis:~> pshell -i script1.txt
Reading config [/Users/sean/.mf_config]
input> cd Demo/sean
Remote: /projects/Demo/sean
input> get IMG_0009.jpg
Total files=1, transferring ...
Progress=100%, rate=0.0 MB/s Completed.
iblis:~> file IMG_0009.jpg
IMG_0009.jpg: JPEG image data |
|
Perform the following:
- write a shell (eg bash) script to run a single pshell command that will fail
- based on the exit code being 0 if successfull and non 0 on failure, report a problem
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Run the following script if you have bash ... sorry Windows users (without WSL.) | Code Block |
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#!/bin/bash
pshell "rmdir /idontexist"
if [ $? == 0 ]; then
echo "All good - proceed further!"
else
echo "Operation failed!"
fi |
Which produces: | Code Block |
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Error from server: The namespace '/idontexist' does not exist or is not accessible
Operation failed! |
This would typically be a job script on (eg) Pawsey HPC - where you would be doing all such work in a Linux environment. The idea is that if something in your data setup pipeline fails - don't waste any valuable cpu time on it. |
Exercise - adapt the previous exercise to perform an upload that will succeed (eg upload a file from your local desktop) and correctly report that the operation was successful.
| Expand |
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You will need two scripts here, one to run pshell (which would be submitted as a job) and another to supply multiple commands to pshell. The second script is needed as, by default, pshell will try to upload into your current working directory (/projects) which you do not have permission to alter. First script, call it: upload.txt | Code Block |
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cd /projects/Demo/sean
put testfile |
Then we can run this: | Code Block |
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#!/bin/bash
pshell -i upload.txt
if [ $? == 0 ]; then
echo "All good - proceed further!"
else
echo "Operation failed!"
fi |