linux 写入单行和多行内容到文件

使用echo写入单行内容

[root@redis-01 kubernetes]# echo "ETCD_DATA_DIR=/var/lib/etcd">test.conf
[root@redis-01 kubernetes]# cat test.conf 
ETCD_DATA_DIR=/var/lib/etcd

单行内容追加

[root@redis-01 kubernetes]# echo "ETCD_NAME=etcd-test">>test.conf 
[root@redis-01 kubernetes]# cat test.conf 
ETCD_DATA_DIR=/var/lib/etcd
ETCD_NAME=etcd-test

多行内容写入

[root@redis-01 kubernetes]# cat >test.conf<<EOF
> ETCD_DATA_DIR_=/var/lib/etcd
> EOF
[root@redis-01 kubernetes]# cat test.conf 
ETCD_DATA_DIR_=/var/lib/etcd

多行内容追加

[root@redis-01 kubernetes]# cat>>test.conf <<EOF
> ETCD_NAME=etcd-test
> EOF
[root@redis-01 kubernetes]# cat test.conf 
ETCD_DATA_DIR_=/var/lib/etcd
ETCD_NAME=etcd-test