Bash while 循环读取和 IFS

Question

我必须解析以下格式的文件:

line1_param1:line1_param2:line1_param3:
line1_param2:line2_param2:line2_param3:
line1_param3:line3_param2:line3_param3:

并逐行处理，从当前行中提取所有参数。目前我是这样管理的:

IFS=":"
grep "nice" some_file | sort > tmp_file
while read param1 param2 param3
do
  ..code here..
done < tmp_file
unset IFS

如何避免创建临时文件？

不幸的是，这不能正常工作:

IFS=":"
while read param1 param2 param3
do
  ..code here..
done <<< $(grep "nice" some_file | sort)
unset IFS

因为整行都分配给了param1。

Answer 1

您可以使用 process substitution为此:

while IFS=: read -r param1 param2 param3
do
   echo "Any code here to process: $param1 $param2 $param3"
done < <(grep "nice" some_file | sort)