柳鲲鵬
擷取某程式名的程序号,顯示其記憶體占用情況。代碼如下:
get_pid()
{
process_name=$1
text=`ps -A | grep $process_name`
# 去掉開頭的空格
text=`echo $text | sed -e 's/^[ \t]*//g'`
# 得到程序号之後的空格
pos=`expr index "$text" " "`
pos=`expr $pos - 1`
#截取程序号
pid=`echo $text | cut -c 1-$pos`
#echo pid=---$pid+++
echo $pid
return 0
}
get_mem()
{
process_id=$1
text=`cat /proc/$process_id/status | grep VmRSS`
pos=`expr index "$text" " "`
text=`echo $text | cut -c $pos-`
pos=`expr index "$text" " "`
pos=`expr $pos - 1`
memory=`echo $text | cut -c 1-$pos`
#echo memory=---$memory+++
echo $memory
return 0
}
# 最好是參數傳遞
PROCESS_NAME="gh_main"
pid=$(get_pid $PROCESS_NAME)
old_memory=$(get_mem $pid)
echo pid=$pid, mem=$old_memory
# 循環。如果記憶體變化,輸出變化情況。
while [ true ] ; do
new_memory=$(get_mem $pid)
if [ $new_memory -ne $old_memory ] ; then
# 便于觀察
echo
echo ---------------------------------
date
diff=`expr $new_memory - $old_memory`
echo $old_memory - $new_memory = $diff
old_memory=$new_memory
fi
done