# Linux中EOF的使用

2 min read
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1）向文件test.sh里输入内容。
[root@slave-server opt]# cat << EOF >test.sh
> 123123123
> 3452354345
> asdfasdfs
> EOF
[root@slave-server opt]# cat test.sh
123123123
3452354345
asdfasdfs


追加内容
[root@slave-server opt]# cat << EOF >>test.sh
> 7777
> 8888
> EOF
[root@slave-server opt]# cat test.sh
123123123
3452354345
asdfasdfs
7777
8888


覆盖
[root@slave-server opt]# cat << EOF >test.sh
> 55555
> EOF
[root@slave-server opt]# cat test.sh
55555


2）自定义EOF，比如自定义为wang
[root@slave-server opt]# cat << wang > haha.txt
> ggggggg
> 4444444
> 6666666
> wang
[root@slave-server opt]# cat haha.txt
ggggggg
4444444
6666666


3）可以编写脚本，向一个文件输入多行内容
[root@slave-server opt]# touch /usr/local/mysql/my.cnf               //文件不提前创建也行，如果不存在，EOF命令中也会自动创建
[root@slave-server opt]# vim test.sh
#!/bin/bash


cat > /usr/local/mysql/my.cnf << EOF                                      //或者cat << EOF > /usr/local/mysql/my.cnf
[client]
port = 3306
socket = /usr/local/mysql/var/mysql.sock


[mysqld]
port = 3306
socket = /usr/local/mysql/var/mysql.sock


basedir = /usr/local/mysql/
datadir = /data/mysql/data
pid-file = /data/mysql/data/mysql.pid
user = mysql
bind-address = 0.0.0.0
server-id = 1
sync_binlog=1
log_bin = mysql-bin


[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M


sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
port = 3306
EOF


[root@slave-server opt]# sh test.sh           //执行上面脚本
[root@slave-server opt]# cat /usr/local/mysql/my.cnf    //检查脚本中的EOF是否写入成功
[client]
port = 3306
socket = /usr/local/mysql/var/mysql.sock


[mysqld]
port = 3306
socket = /usr/local/mysql/var/mysql.sock


basedir = /usr/local/mysql/
datadir = /data/mysql/data
pid-file = /data/mysql/data/mysql.pid
user = mysql
bind-address = 0.0.0.0
server-id = 1
sync_binlog=1
log_bin = mysql-bin


[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M


sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
port = 3306
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