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pssh: improve page (#1466)
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# pssh
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> Parallel ssh program.
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> Parallel SSH program.
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- Run a command on host1 and host2 to print the date on each server inline:
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- Run a command on two hosts, and print its output on each server inline:
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`pssh -i -H "{{host1}} {{host2}}" {{date}}`
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`pssh -i -H "{{host1}} {{host2}}" {{hostname -i}}`
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- Run a command and save the output to separate files:
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`pssh -H {{host1}} -H {{host2}} -o {{path/to/output_dir}} {{date}}`
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`pssh -H {{host1}} -H {{host2}} -o {{path/to/output_dir}} {{hostname -i}}`
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- Run a command on each host specified in a new-line separated host file:
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- Run a command on multiple hosts, specified in a new-line separated file:
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`pssh -i -h {{path/to/hosts_file}} {{date}}`
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`pssh -i -h {{path/to/hosts_file}} {{hostname -i}}`
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- Run a command as root; asks for root password:
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- Run a command as root (this asks for the root password):
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`pssh -i -h {{path/to/hosts_file}} -A -l {{root}} {{date}}`
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`pssh -i -h {{path/to/hosts_file}} -A -l {{root_username}} {{hostname -i}}`
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- Run a command with extra SSH arguments:
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`pssh -i -h {{path/to/hosts_file}} -x "{{-O VisualHostKey=yes}}" {{date}}`
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`pssh -i -h {{path/to/hosts_file}} -x "{{-O VisualHostKey=yes}}" {{hostname -i}}`
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- Run a command using a maximum number of concurrent connections:
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- Run a command limiting the number of parallel connections to 10:
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`pssh -i -h {{path/to/hosts_file}} -p {{10}} '{{cd dir; ./script.sh; exit}}'`
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