Update cheatsheets

pssh

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pssh
+
+> Parallel SSH program.
+> More information: <https://manned.org/pssh>.
+
+- Run a command on two hosts, and print its output on each server inline:
+
+`pssh -i -H "{{host1}} {{host2}}" {{hostname -i}}`
+
+- Run a command and save the output to separate files:
+
+`pssh -H {{host1}} -H {{host2}} -o {{path/to/output_dir}} {{hostname -i}}`
+
+- Run a command on multiple hosts, specified in a new-line separated file:
+
+`pssh -i -h {{path/to/hosts_file}} {{hostname -i}}`
+
+- Run a command as root (this asks for the root password):
+
+`pssh -i -h {{path/to/hosts_file}} -A -l {{root_username}} {{hostname -i}}`
+
+- Run a command with extra SSH arguments:
+
+`pssh -i -h {{path/to/hosts_file}} -x "{{-O VisualHostKey=yes}}" {{hostname -i}}`
+
+- Run a command limiting the number of parallel connections to 10:
+
+`pssh -i -h {{path/to/hosts_file}} -p {{10}} '{{cd dir; ./script.sh; exit}}'`