通过 SSH 执行命令时无法使用别名

Question

我在 .bashrc 中注释掉了这一行：

# [ -z "$PS1" ] && return

现在别名已被读取，但我仍然无法执行它...：/

我们可以询问服务器是否定义了别名：

$ ssh server "cd /tmp && alias backup_tb"
alias backup_tb='pg_dump -U david tb > tb.sql'

但它没有展开：

$ ssh server "cd /tmp && backup_tb"
bash: backup_tb: command not found

有什么想法吗？

Answer 1

# WARNING!!!! Just effective in openssh-server.!!!!!!!

# cd your loacl user .ssh path 
# if you want to make all user has the same alias you should go to 
#'/etc/ssh' touch a file 'sshrc'
# what is 'sshrc'? he has the same function as 'rc.local',just a shell 
# script when you first login.  

# The following is a configuration of the current user .
cd ~/.ssh

touch sshrc  

chmod +x sshrc

#edit sshrc and type 

alias ll="ls -lah --color"

#Apply changes

source sshrc 

Answer 2

引用自bash 的手册页：当 shell 不交互时，别名不会展开，除非使用 shopt 设置了 expand_aliases shell 选项...

因此，IMO 最简单的方法是将以下几行放在 /home/<user>/.bashrc 文件的顶部：

# comment out the original line
# [ -z "$PS1" ] && return

if [ -z "$PS1" ]; then
  shopt -s expand_aliases
  # alias ls='ls --color=always'
  # return
fi

保存并退出。现在你可以成功运行ssh user@host "your_alias"了。