$ \textbf{echo 'this is my first line' > oldfile}
$ \textbf{echo 'my first line is here' > newfile}
$ \textbf{diff -u oldfile newfile > tiny.patch}
$ \textbf{cat tiny.patch}


@@ -1 +1 @@
-this is my first line
+my first line is here
$ \textbf{patch < tiny.patch}
patching file oldfile
$ \textbf{cat newfile}
my first line is here