groupadd lianyu
useradd lianyu -g lianyu
passwd lianyucd /home/lianyu
ls -a
. .. .bash_history .bash_logout .bash_profile .bashrc .cache CATALINA_HOME_IS_UNDEFINED .config .dubbo .ssh .viminfo
编辑.bash_profile，来指定：
'# .bash_profile
'# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
'# User specific environment and startup programs
export IPOWER_HOME=/usr/local/
PATH=$PATH:$HOME/.local/bin:$HOME/bin
export PATH
cd $IPOWER_HOME