Move pages under tldr, lint run.sh, update docs

tldr/linux/rexec

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rexec
+
+> Execute a command on a remote host.
+> Note: Use `rexec` with caution, as it transmits data in plain text. Consider secure alternatives like `ssh` for encrypted communication.
+> More information: <https://www.gnu.org/software/inetutils/manual/html_node/rexec-invocation.html>.
+
+- Execute a command on a remote [h]ost:
+
+`rexec -h={{remote_host}} {{ls -l}}`
+
+- Specify the remote [u]sername on a remote [h]ost:
+
+`rexec -username={{username}} -h={{remote_host}} {{ps aux}}`
+
+- Redirect `stdin` from `/dev/null` on a remote [h]ost:
+
+`rexec --no-err -h={{remote_host}} {{ls -l}}`
+
+- Specify the remote [P]ort on a remote [h]ost:
+
+`rexec -P={{1234}} -h={{remote_host}} {{ls -l}}`