我有以下文件格式
Received from +11231231234 at 2021-10-10T19:56:50-07:00:
This is a message that contains words like from, at, etc.
Sent to +11231231234 at 2021-10-11T06:50:57+00:00:
This is another message that contains words like to, at, etc.
我想清理“已接收”和“已发送”行，以下 sed 命令可以实现此目的
cat file | sed 's/from//g' | sed 's/to/ /g' | sed 's/+\w\+//' | \
sed 's/at//g' | sed 's/T/ /g' | sed 's/[[:digit:].]*\:$//' | \
sed 's/[[:digit:].]*\:$//' | sed 's/-$//' | sed 's/-$//' | sed 's/+$//'
并产生以下结果
Received 2021-10-10 19:56:50
This is a message …