Terminal方向键不可用，tab无法补全命令，且界面无颜色_vscode terminal 方向键不能用-优快云博客

原因：

1./bin/bash 和 /bin/sh

查看当前登陆shell

cat /etc/passwd|grep [username]

或者

echo $SHELL

That probably means that the new user account was created with /bin/sh as its login shell (which symlinks to the dash shell by default) instead of /bin/bash - you can change a user's login shell with the 'chsh' command

sudo chsh -s /bin/bash <username>

(you will need to log out and back in for the change to take effect). You may also need to copy the default .bashrc from /etc/skel to get the color prompt.

2. adduser 和useradd

In future you might want to use the 'adduser' command instead of 'useradd' - it sets up a more complete user environment including things like a default .profile and .bashrc - as well as setting the login shell to 'bash'

3. 这个问题可能是ubuntu特有的

在一个Debian系统的sh并没有出现上面的问题

4.profile 和 bashrc

profile中的配置要用户登陆才会加载，profile中有运行bashrc的语句

# if running bash
if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
        . "$HOME/.bashrc"
    fi
fi

bashrc中的配置，非交互的bash 会加载，我猜sh一类的命令也会加载这个文件，运行脚本文件也会加载其中的配置

所以如果在terminal中输入bash 打开另一个bash，则bashrc 会加载两次，即：

如果bashrc 中有PATH=$PATH:XXX这类语句，则在检讨打开的bash中，echo $PATH的结果为

.......:XXX:XXX

http://www.cnblogs.com/hongzg1982/articles/2101792.html

http://blog.chinaunix.net/uid-589727-id-2732667.html

参考：

1.http://askubuntu.com/questions/325807/arrow-keys-tab-complete-not-working