linux多行追加输入

将多行信息追加到文件

# 方法 1:
echo "line 1" >> greetings.txt
echo "line 2" >> greetings.txt

# 方法 2:
echo "line 1
line 2" >> greetings.txt

# 方法 3:
cat <<EOT >> greetings.txt
line 1
line 2
EOT

参考内容
[1]: https://unix.stackexchange.com/questions/77277/how-to-append-multiple-lines-to-a-file