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Top Forums UNIX for Beginners Questions & Answers Help understanding what this ls -l command is checking in a script Post 303039571 by jim mcnamara on Wednesday 9th of October 2019 06:52:24 PM
Old 10-09-2019
The command connects to a remote server, does and ls -l of a directory, which list files in the directory on the remote machine. The command is between the tic characters '

The output of the ls command goes into the bit bucket (kind of like a black hole for output). The status of the ssh connect and ls (success ( == 0 ) or failure code (== non-zero) ) is stored in the variable $status.

A sort of roundabout way to see if the remote machine is awake on the network, and if the directory exists over there. The options -qno for ssh:
-n used to run in the background when ssh does not read from user's stdin (terminal)
-q quiet mode, stops extra messages
-o (option) turn off strict host key checking. I wonder why...
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HWLOC-ASSEMBLER-REMOTE(1)					       hwloc						 HWLOC-ASSEMBLER-REMOTE(1)

NAME
hwloc-assembler-remote - Assemble multiple remote host topologies SYNOPSIS
hwloc-assembler-remote [options] output.xml host1 host2 ... OPTIONS
--ssh <ssh> Use the given ssh command (and options) to connect to remote hosts. --lstopo-path <path> Use the given path as the remote lstopo command when gathering remote topologies. By default, lstopo is taken from the PATH envi- ronment variable. --lstopo-opts <opts> Pass the given lstopo options when gathering remote topologies. --show Display the resulting topology before exit. -v --verbose Verbose messages. DESCRIPTION
hwloc-assembler-remote is a frontend to hwloc-assembler. It takes care of retrieving the remote nodes' topologies before assembling them with hwloc-assembler. EXAMPLES
To assemble three nodes topologies: $ hwloc-assembler-remote output.xml host1 host2 host3 To assemble the topology of a multi-process MPI job defined as a machinefile: $ hwloc-assembler-remote output.xml `cat machinefile | sort | uniq` RETURN VALUE
Upon successful execution, hwloc-assembler-remote returns 0. hwloc-assembler-remote will return nonzero if any kind of error occurs, such as (but not limited to) failure to parse the command line. SEE ALSO
hwloc(7), lstopo(1), hwloc-assembler(1) 1.4.1 Feb 27, 2012 HWLOC-ASSEMBLER-REMOTE(1)
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