+\newcommand{\sysctlfile}[1]{%
+\index{file!file di controllo (sotto \texttt{/proc/sys})!{#1}@{{\tt {#1}}}}\texttt{/proc/sys/#1}%
+%\index{#1@{{\tt {#1}} (direttiva)}}\texttt{#1}%
+} % /proc/sys file name
+
+\newcommand{\sysctlrelfile}[2]{%
+\index{file!file di controllo (sotto \texttt{/proc/sys})!{#1/#2}@{{\tt {#1/#2}}}}\texttt{#2}%
+%\index{#1@{{\tt {#1}} (direttiva)}}\texttt{#1}%
+} % /proc/sys file name