一、把内容写入到文件
1、echo命令
echo把指定内容写入文件并覆盖原有内容
[root@node-01 ~]# echo "hello,world" > readme.txt[root@node-01 ~]# cat readme.txthello,world
echo把指定内容追加到文件末尾
[root@node-01 ~]# echo "world" >> readme.txt[root@node-01 ~]# cat readme.txt hello world
2、cat命令
创建新的文件readme.txt，并开始写入内容，直到输入EOF结束
[root@node-01 ~]# cat > readme.txt <<EOF> A > B > C > EOF
cat命令把内容追加到文件末尾
[root@node-01 ~]# cat >> readme.txt <<EOF> e > f > g > EOF [root@node-01 ~]# cat readme.txt hello world e f g [root@node-01 ~]#
二、从标准输入流读取数据写入文件
1、tee命令
tee命令从标准输入读取数据写入文件
[root@node-01 ~]# ping baidu.com | tee readme.txtPING baidu.com (220.181.38.251) 56(84) bytes of data. 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=1ttl=128time=29.4 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=2ttl=128time=29.7 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=4ttl=128time=31.9 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=5ttl=128time=45.4 ms
tee命令从标准输入读取数据追加到文件
[root@node-01 ~]# ping baidu.com | tee -a readme.txtPING baidu.com (220.181.38.251) 56(84) bytes of data. 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=1ttl=128time=29.4 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=2ttl=128time=29.7 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=4ttl=128time=31.9 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=5ttl=128time=45.4 ms
tee命令从把输入写入到多个文件
[root@node-01 ~]# ping baidu.com | tee -a readme.txt readme2.txtPING baidu.com (220.181.38.251) 56(84) bytes of data. 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=1ttl=128time=29.4 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=2ttl=128time=29.7 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=4ttl=128time=31.9 ms 64 bytes from 220.181.38.251 (220.181.38.251): icmp_seq=5ttl=128time=45.4 ms
