IF 语句不适用于两个变量 echo 和 grep

Question

我有以下代码不起作用，我不知道为什么：

$ cat test.sh
#Variables
list_of_items=$(ls /items)
my_item=ccc

#Check if my item is on the list
if [ echo ${list_of_items} | grep -wc ${my_item} -eq 0 ]
 then echo "This item is not on the list."
fi

$ ./test.sh
./test.sh: line 6: [: missing `]'
grep: ccc: No such file or directory
grep: 0: No such file or directory
grep: ]: No such file or directory
$ 

这个想法是检查单词列表 (ls) 中是否存在一个确切的单词。你能帮我吗？

提前致谢。

丹尼尔

Answer 1

重击：

shopt -s nullglob
matches=( /items/*"$my_item"* )
if (( "${#matches[@]}" == 0 )); then
  echo "File matching $my_item not found"
fi

Answer 2

关闭！

$ cat test.sh
#Variables
list_of_items=$(ls /items)
my_item=ccc

#Check if my item is on the list
if [ $( echo ${list_of_items} | grep -wc ${my_item} ) -eq 0 ]
 then echo "This item is not on the list."
fi