diff --git a/tldr/cpio b/tldr/cpio
index 1a8e227b..bf1e47a8 100644
--- a/tldr/cpio
+++ b/tldr/cpio
@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Copy files in and out of archives.
 > Supports the following archive formats: cpio's custom binary, old ASCII, new ASCII, crc, HPUX binary, HPUX old ASCII, old tar, and POSIX.1 tar.
-> More information: <https://www.gnu.org/software/cpio>.
+> More information: <https://www.gnu.org/software/cpio/manual/cpio.html#Invoking-cpio>.
 
 - Take a list of file names from `stdin` and add them onto an archive (copy-[o]ut) in cpio's binary forma:
 
diff --git a/tldr/g++ b/tldr/g++
index 954dcec9..4517cbab 100644
--- a/tldr/g++
+++ b/tldr/g++
@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Compile C++ source files.
 > Part of GCC (GNU Compiler Collection).
-> More information: <https://gcc.gnu.org>.
+> More information: <https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Dialect-Options.html>.
 
 - Compile a source code file into an executable binary:
 
diff --git a/tldr/gcal b/tldr/gcal
index 2b264ee8..e039fa8e 100644
--- a/tldr/gcal
+++ b/tldr/gcal
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # gcal
 
 > Display calendar.
-> More information: <https://www.gnu.org/software/gcal>.
+> More information: <https://www.gnu.org/software/gcal/manual/gcal.html#Invoking-Gcal>.
 
 - Display calendar for the current month:
 
diff --git a/tldr/gcc b/tldr/gcc
index 660250c2..a13adfa2 100644
--- a/tldr/gcc
+++ b/tldr/gcc
@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Preprocess and compile C and C++ source files, then assemble and link them together.
 > Part of GCC (GNU Compiler Collection).
-> More information: <https://gcc.gnu.org>.
+> More information: <https://gcc.gnu.org/onlinedocs/gcc/>.
 
 - Compile multiple source files into an executable:
 
diff --git a/tldr/gdb b/tldr/gdb
index 9b74f9e6..e6931590 100644
--- a/tldr/gdb
+++ b/tldr/gdb
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # gdb
 
 > The GNU Debugger.
-> More information: <https://www.gnu.org/software/gdb>.
+> More information: <https://sourceware.org/gdb/current/onlinedocs/gdb#Invocation>.
 
 - Debug an executable:
 
diff --git a/tldr/git-help b/tldr/git-help
index 062b8019..0e100818 100644
--- a/tldr/git-help
+++ b/tldr/git-help
@@ -22,7 +22,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - List the available guides:
 
-`git help {{[-g|--guide]}}`
+`git help {{[-g|--guides]}}`
 
 - List all possible configuration variables:
 
diff --git a/tldr/guile b/tldr/guile
index 09fe57a8..74a19876 100644
--- a/tldr/guile
+++ b/tldr/guile
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # guile
 
 > Guile Scheme interpreter.
-> More information: <https://www.gnu.org/software/guile>.
+> More information: <https://www.gnu.org/software/guile/manual/guile.html#Invoking-Guile>.
 
 - Start a REPL (interactive shell):
 
diff --git a/tldr/help2man b/tldr/help2man
index 64a0c47f..4ac11e3d 100644
--- a/tldr/help2man
+++ b/tldr/help2man
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # help2man
 
 > Produce simple man pages from an executable's `--help` and `--version` output.
-> More information: <https://www.gnu.org/software/help2man>.
+> More information: <https://www.gnu.org/software/help2man/#Invoking-help2man>.
 
 - Generate a man page for an executable:
 
diff --git a/tldr/linux/links b/tldr/linux/links
index aa5970e5..6707abbe 100644
--- a/tldr/linux/links
+++ b/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:
diff --git a/tldr/linux/links2 b/tldr/linux/links2
index 40583dde..8c69a221 100644
--- a/tldr/linux/links2
+++ b/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>.
 
diff --git a/tldr/linux/systemctl-show-environment b/tldr/linux/systemctl-show-environment
new file mode 100644
index 00000000..04892b90
--- /dev/null
+++ b/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`
diff --git a/tldr/linux/zile b/tldr/linux/zile
index 640cf26f..b13927f6 100644
--- a/tldr/linux/zile
+++ b/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:
 
diff --git a/tldr/lzip b/tldr/lzip
index 5b73bfe5..bc4c99fd 100644
--- a/tldr/lzip
+++ b/tldr/lzip
@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > A lossless data compressor with a user interface similar to `gzip` or `bzip2`.
 > Lzip uses a simplified form of the "Lempel-Ziv-Markovchain-Algorithm" (LZMA) stream format and provides 3-factor integrity checking to maximize interoperability and optimize safety.
-> More information: <https://www.nongnu.org/lzip>.
+> More information: <https://www.nongnu.org/lzip/manual/lzip_manual.html#Invoking-lzip>.
 
 - Archive a file, replacing it with with a compressed version:
 
diff --git a/tldr/m4 b/tldr/m4
index 705b9724..00192d6a 100644
--- a/tldr/m4
+++ b/tldr/m4
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # m4
 
 > Macro processor.
-> More information: <https://www.gnu.org/software/m4>.
+> More information: <https://www.gnu.org/software/m4/manual/m4.html#Invoking-m4>.
 
 - Process macros in a file:
 
diff --git a/tldr/parallel b/tldr/parallel
index c2fdeb4d..6ae4816f 100644
--- a/tldr/parallel
+++ b/tldr/parallel
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # parallel
 
 > Run commands on multiple CPU cores.
-> More information: <https://www.gnu.org/software/parallel>.
+> More information: <https://www.gnu.org/software/parallel/man.html>.
 
 - Gzip several files at once, using all cores:
 
diff --git a/tldr/tar b/tldr/tar
index 76910a15..6c60800d 100644
--- a/tldr/tar
+++ b/tldr/tar
@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Archiving utility.
 > Often combined with a compression method, such as `gzip` or `bzip2`.
-> More information: <https://www.gnu.org/software/tar>.
+> More information: <https://www.gnu.org/software/tar/manual/tar.html>.
 
 - [c]reate an archive and write it to a [f]ile:
 
diff --git a/tldr/units b/tldr/units
index 8b217b36..d6553b62 100644
--- a/tldr/units
+++ b/tldr/units
@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # units
 
 > Convert between two units of measure.
-> More information: <https://www.gnu.org/software/units/>.
+> More information: <https://www.gnu.org/software/units/manual/units.html>.
 
 - Run in interactive mode: