在某些Linux机器上，开启screen后，当设置了tab的title（Ctrl+A，A）后，输入任意命令，tab title会被重置为机器名称。

之前在某厂实习的时候，也遇到了相同的问题，一直以为是screen配置的问题。

其实，这是bash的配置。

看~/.bashrc：

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

而在/etc/bashrc中，有以下几行：

# are we an interactive shell?
if [ "$PS1" ]; then
    case $TERM in
    xterm*)
        if [ -e /etc/sysconfig/bash-prompt-xterm ]; then
            PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm
        else
            PROMPT_COMMAND='echo -ne "3]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "
# are we an interactive shell?
if [ "$PS1" ]; then
    case $TERM in
    xterm*)
        if [ -e /etc/sysconfig/bash-prompt-xterm ]; then
            PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm
        else
            PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "\007"'
        fi
        ;;
    screen)
        if [ -e /etc/sysconfig/bash-prompt-screen ]; then
            PROMPT_COMMAND=/etc/sysconfig/bash-prompt-screen
        else
        PROMPT_COMMAND='echo -ne "\033_${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "\033\\"'
        fi
        ;;
    *)  
        [ -e /etc/sysconfig/bash-prompt-default ] && PROMPT_COMMAND=/etc/sysconfig/bash-prompt-default
        ;;
    esac
    # Turn on checkwinsize
    shopt -s checkwinsize
    [ "$PS1" = "\\s-\\v\\\$ " ] && PS1="[\u@\H \W]\\$ "
fi
7"'
        fi
        ;;
    screen)
        if [ -e /etc/sysconfig/bash-prompt-screen ]; then
            PROMPT_COMMAND=/etc/sysconfig/bash-prompt-screen
        else
        PROMPT_COMMAND='echo -ne "3_${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "3\\"'
        fi
        ;;
    *)  
        [ -e /etc/sysconfig/bash-prompt-default ] && PROMPT_COMMAND=/etc/sysconfig/bash-prompt-default
        ;;
    esac
    # Turn on checkwinsize
    shopt -s checkwinsize
    [ "$PS1" = "\\s-\\v\\\$ " ] && PS1="[\u@\H \W]\$ "
fi

不难发现，若检测当前为screen的时候，强制写入了shell的标题为机器名，而这个值的设定，与screen tab的title实际是冲突的，因此，我们只要把screen的这个switch注视掉，就好了。

如下：

# are we an interactive shell?
if [ "$PS1" ]; then
    case $TERM in
    xterm*)
        if [ -e /etc/sysconfig/bash-prompt-xterm ]; then
            PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm
        else
            PROMPT_COMMAND='echo -ne "3]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "
# are we an interactive shell?
if [ "$PS1" ]; then
    case $TERM in
    xterm*)
        if [ -e /etc/sysconfig/bash-prompt-xterm ]; then
            PROMPT_COMMAND=/etc/sysconfig/bash-prompt-xterm
        else
            PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "\007"'
        fi
        ;;
    #screen)
    #   if [ -e /etc/sysconfig/bash-prompt-screen ]; then
    #       PROMPT_COMMAND=/etc/sysconfig/bash-prompt-screen
    #   else
    #       PROMPT_COMMAND='echo -ne "\033_${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "\033\\"'
    #   fi
    #   ;;
    *)  
        [ -e /etc/sysconfig/bash-prompt-default ] && PROMPT_COMMAND=/etc/sysconfig/bash-prompt-default
        ;;
    esac
    # Turn on checkwinsize
    shopt -s checkwinsize
    [ "$PS1" = "\\s-\\v\\\$ " ] && PS1="[\u@\H \W]\\$ "
fi
7"'
        fi
        ;;
    #screen)
    #   if [ -e /etc/sysconfig/bash-prompt-screen ]; then
    #       PROMPT_COMMAND=/etc/sysconfig/bash-prompt-screen
    #   else
    #       PROMPT_COMMAND='echo -ne "3_${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}"; echo -ne "3\\"'
    #   fi
    #   ;;
    *)  
        [ -e /etc/sysconfig/bash-prompt-default ] && PROMPT_COMMAND=/etc/sysconfig/bash-prompt-default
        ;;
    esac
    # Turn on checkwinsize
    shopt -s checkwinsize
    [ "$PS1" = "\\s-\\v\\\$ " ] && PS1="[\u@\H \W]\$ "
fi

这个我猜测不是管理员配置的，在CentOS、RHEL等同源发行版上，都有类似的配置。