Update cheatsheets

tldr/linux/links

@@ -5,7 +5,8 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # links
 
-> Command-line web browser.
+> Command-line text-only web browser.
+> See also: `links2'.
 > More information: <http://links.twibright.com/user_en.html#subch-browser_calibration>.
 
 - Visit a website:

tldr/linux/links2

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # links2
 
-> Command-line web browser.
+> Command-line web browser with optional graphics support.
 > See also: `links`.
 > More information: <http://links.twibright.com/user_en.html#subch-browser_calibration>.
 

tldr/linux/systemctl-show-environment

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl show-environment
+
+> Display systemd environment blocks.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#show-environment>.
+
+- Display the environment block for the system:
+
+`systemctl show-environment`
+
+- Display the environment block for the current user:
+
+`systemctl show-environment --user`

tldr/linux/zile

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # zile
 
 > A lightweight clone of the Emacs text editor.
-> More information: <https://www.gnu.org/software/zile/>.
+> More information: <https://manned.org/zile>.
 
 - Start a buffer for temporary notes, which won't be saved: