#!/bin/sh
+DELAY=1
null() {
:
}
-if [ $1 == "-q" ]; then
- echo "echo off"
+case "$1" in
+-q) echo "echo off"
ECHO="null"
- shift
-else
+ shift ;;
+[1-9]*)
+ DELAY=$1
+ ECHO=echo
+ shift ;;
+*)
echo "echo on"
ECHO=echo
-fi
-vmstat 1 | while read LINE ; do
+esac
+
+vmstat $DELAY | while read LINE ; do
LINE="`date +%s`: $LINE"
$ECHO "$LINE"
[ "$1" ] && echo "$LINE" >> $1