Bash: 如何以grep的结果做为if condition

#!/bin/ksh
grep $NAME filename
if [ $? -eq 0 ]
   echo "Name Found"
else
   echo " Name not Found"
fi

The $? holds the exit status of the previously executed command. Check the man page please.

来源：https://www.unix.com/shell-programming-and-scripting/30996-using-grep-if-statement.html

虽然上面是针对是ksh，但是bash同样适合：

for item in *.json; do
    # grep "perl" "$item" > /dev/null #为了不在屏幕上显示grep结果
    # 或者:
    grep -q "perl" "$item"
    if [ $? -eq 0 ]; then #如果搜索到perl，则$?会是0，否则为1
        echo $item #输出含有perl的文件，对应的文件名
    fi
done