expect spawn報錯invalid command name

在編寫shell腳本中，使用免交互方式spawn追蹤進程報錯

原腳本內容（編寫redis一鍵安裝部署腳本） 

/usr/bin/expect <<EOF
cd /opt/redis-5.0.7/utils
spawn ./install_server.sh
expect "instance: [6379]" {send "\r"}
expect "[/etc/redis/6379.conf]" {send "\r"}
expect "[/var/log/redis_6379.log]" {send "\r"}
expect "[/var/lib/redis/6379]" {send "\r"}
expect "path []" {send "/usr/local/redis/bin/redis-server"}
expect eof
EOF

查找原因，並嘗試分解各個步驟

最后發現，是expect里面的內容中的括號【】有問題，不能使用[],將其去除即可執行了，或者使用 -ex {}，把語句放到大括號中即可

send中也是如此，也不可用[]，需要轉義或者使用send -- {}格式，將send的內容放到大括號中轉義　

修改后的腳本

yum -y install expect &> /dev/null
/usr/bin/expect <<EOF
cd /opt/redis-5.0.7/utils
spawn /opt/redis-5.0.7/utils/install_server.sh
expect "instance:" {send "\r"}
expect "/etc/redis/6379.conf" {send "\r"}
expect "/var/log/redis_6379.log" {send "\r"}
expect "/var/lib/redis/6379" {send "\r"}
expect "path" {send "/usr/local/redis/bin/redis-server\r"}
expect "ENTER" {send "\r"}
expect eof
EOF