switch_root, tailf, uuidparse, waitpid: add pages

pages/linux/switch_root.md

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+# switch_root
+
+> Use a different filesystem as the root of the mount tree.
+> NOTE: switch_root will fail to function if the new root is not the root of a mount. Use bind-mounting as a workaround.
+> See also: `chroot`, `mount`.
+> More information: <https://manned.org/switch_root.8>.
+
+- Move `/proc`, `/dev`, `/sys` and `/run` to the specified filesystem, use this filesystem as the new root and start the specified init process:
+
+`switch_root {{new_root}} {{/sbin/init}}`
+
+- Display help:
+
+`switch_root -h`

pages/linux/tailf.md

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+# tailf
+
+> This command is superseded by `tail -f`.
+> More information: <https://manned.org/tailf.1>.
+
+- View documentation for the recommended replacement:
+
+`tldr tail`

pages/linux/uuidparse.md

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+# uuidparse
+
+> Parse universally unique identifiers.
+> See also: `uuidgen`.
+> More information: <https://manned.org/uuidparse.1>.
+
+- Parse the specified UUIDs, use a tabular output format:
+
+`uuidparse {{uuid1 uuid2 ...}}`
+
+- Parse UUIDs from `stdin`:
+
+`{{command}} | uuidparse`
+
+- Use the JSON output format:
+
+`uuidparse --json {{uuid1 uuid2 ...}}`
+
+- Do not print a header line:
+
+`uuidparse --noheadings {{uuid1 uuid2 ...}}`
+
+- Use the raw output format:
+
+`uuidparse --raw {{uuid1 uuid2 ...}}`
+
+- Specify which of the four output columns to print:
+
+`uuidparse --output {{UUID,VARIANT,TYPE,TIME}}`
+
+- Display help:
+
+`uuidparse -h`

pages/linux/waitpid.md

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+# waitpid
+
+> Wait for the termination of arbitrary processes.
+> See also: `wait`.
+> More information: <https://manned.org/waitpid.1>.
+
+- Sleep until all processes whose PIDs have been specified have exited:
+
+`waitpid {{pid1 pid2 ...}}`
+
+- Sleep for at most `n` seconds:
+
+`waitpid --timeout {{n}} {{pid1 pid2 ...}}`
+
+- Do not error if specified PIDs have already exited:
+
+`waitpid --exited {{pid1 pid2 ...}}`
+
+- Sleep until `n` of the specified processes have exited:
+
+`waitpid --count {{n}} {{pid1 pid2 ...}}`
+
+- Display help:
+
+`waitpid -h`