alien: add page (#7080)

pages/linux/alien.md

@@ -0,0 +1,20 @@
+# alien
+
+> Convert different instalation packages to other formats.
+> More information: <https://manned.org/alien>.
+
+- Convert a specific installation file to Debian format (`.deb` extension):
+
+`sudo alien --to-deb {{path/to/file}}`
+
+- Convert a specific installation file to Red Hat format (`.rpm` extension):
+
+`sudo alien --to-rpm {{path/to/file}}`
+
+- Convert a specific installation file to a Slackware installation file (`.tgz` extension):
+
+`sudo alien --to-tgz {{path/to/file}}`
+
+- Convert a specific installation file to Debian format and install on the system:
+
+`sudo alien --to-deb --install {{path/to/file}}`