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+# Exclamation mark
+
+> Bash builtin to substitute with a command found in history.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#Event-Designators>.
+
+- Substitute with the previous command and run it with sudo:
+
+`sudo !!`
+
+- Substitute with a command based on its line number found with `history`:
+
+`!{{number}}`
+
+- Substitute with a command that was used specified lines back:
+
+`!-{{number}}`
+
+- Substitute with the most recent command that starts with `string`:
+
+`!{{string}}`