tlmgr-gui: add page (#6467)

pages/common/tlmgr-gui.md

@@ -0,0 +1,29 @@
+# tlmgr gui
+
+> Start a graphical user interface for `tlmgr`.
+> `tlmgr gui` depends on the package `perl-tk`, which has to be installed manually.
+> More information: <https://www.tug.org/texlive/tlmgr.html>.
+
+- Start a GUI for `tlmgr`:
+
+`sudo tlmgr gui`
+
+- Start a GUI specifying the background color:
+
+`sudo tlmgr gui -background "{{#f39bc3}}"`
+
+- Start a GUI specifying the foreground color:
+
+`sudo tlmgr gui -foreground "{{#0ef3bd}}"`
+
+- Start a GUI specifying the font and font size:
+
+`sudo tlmgr gui -font "{{helvetica 18}}"`
+
+- Start a GUI setting a specific geometry:
+
+`sudo tlmgr gui -geometry {{width}}x{{height}}-{{xpos}}+{{ypos}}`
+
+- Start a GUI passing an arbitrary X resource string:
+
+`sudo tlmgr gui -xrm {{xresource}}`