rankmirrors: add page (#5217)

pages/linux/rankmirrors.md

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+# rankmirrors
+
+> Rank a list of Pacman mirrors by connection and opening speed.
+> Writes the new mirrorlist to stdout.
+> More information: <https://wiki.archlinux.org/index.php/mirrors>.
+
+- Rank a mirror list:
+
+`rankmirrors {{/etc/pacman.d/mirrorlist}}`
+
+- Output only a given number of the top ranking servers:
+
+`rankmirrors -n {{number}} {{/etc/pacman.d/mirrorlist}}`
+
+- Be verbose when generating the mirrorlist:
+
+`rankmirrors -v {{/etc/pacman.d/mirrorlist}}`
+
+- Test only a specific URL:
+
+`rankmirrors --url {{url}}`
+
+- Output only the response times instead of a full mirrorlist:
+
+`rankmirrors --times {{/etc/pacman.d/mirrorlist}}`