diff --git a/docs/linux/bash/lineinfile.sh b/docs/linux/bash/lineinfile.sh
new file mode 100755
index 0000000..8027f42
--- /dev/null
+++ b/docs/linux/bash/lineinfile.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+line=${1:?}
+regex=${2:-1}
+sed -E -e "/$regex/{s/.*/$line/;:a;n;ba;q}" -e "\$a $line"