腳本shell：說了多少次，用戶登錄

Question

我有以下幾點：

count=$(who | grep $user | wc -l) 
echo "$user is logged on $count times." 

but it gives me the following output: 
is logged on  0 times. 

我缺少什麼嗎？ 感謝任何幫助

Answer 1

您正在使用$user，但需要$USER。像，

count=$(who | grep $USER | wc -l) 
echo "$USER is logged on $count times." 

我得到

efrisch is logged on 4 times. 

另一種選擇是printf像

printf "%s is logged on %s times.\n" $USER $(who | grep $USER | wc -l) 

了相同的結果。