qsub:tldr:2ba93

The command qsub -l nodes=${2}:ppn=${4} ${script-sh} is used to submit a job to a job scheduler, typically found in high-performance computing (HPC) environments.

Here is a breakdown of the components of the command:

1. qsub: This is the command to submit a job to the job scheduler.
2. -l: This flag is used to specify resource requirements for the job.
3. nodes=${2}: This sets the number of compute nodes requested for the job. ${2} is a placeholder that should be replaced with an actual value when executing the command. For example, if you want to request 4 nodes, you would replace ${2} with 4.
4. ppn=${4}: This specifies the number of processors per node requested for the job. ${4} is a placeholder that should be replaced with an actual value. For example, if you want to request 8 processors per node, you would replace ${4} with 8.
5. ${script-sh}: This is the path to the shell script file that contains the commands or job script to be executed. ${script-sh} is a placeholder that should be replaced with the actual path to the file.

Overall, this command is used to submit a job to the job scheduler, specifying the number of nodes and processors requested, and providing the path to the shell script file to be executed as the job.