Adding a few more useful examples.

Sed's cheat sheet was a little light, here are a few more examples.

sheets/sed

@@ -1,2 +1,14 @@
-# Edit a file, via substitution, in-place; changes are made to the file(s).
+# Preview a file edit, via substitution.
+sudo sed 's/Name=Xfce Session/Name=Xfce_Session/' /usr/share/xsessions/xfce.desktop
+
+# Replace the same string more than once (appending g flag), via substitution.
+sudo sed 's/Name=Xfce Session/Name=Xfce_Session/g' /usr/share/xsessions/xfce.desktop
+
+# Edit a file (adding -i flag), via substitution, in-place; changes are made to the file(s).
 sudo sed -i 's/Name=Xfce Session/Name=Xfce_Session/' /usr/share/xsessions/xfce.desktop
+
+# It can become necessary to escape special characters in your string.
+sed -i 's/\/path\/to\/somewhere\//\/path\/to\/anotherplace\//'
+
+# Change your sed delimiter to a pipe to avoid escaping slashes.
+sed -i 's|/path/to/somewhere/|/path/to/anotherplace/|'