用法
alias[别名]=[指令名称]
alias bakapi='cp -f /usr/local/tomcat/webapps/api.war /usr/local/tomcat/bak/'
alias baktimer='cp -f /usr/local/tomcat/webapps/timer-1.0-SNAPSHOT.jar /usr/local/tomcat/bak/'
tar czvf CZYH95.tar CZYH95
tar -zcvf tomcat8.tar.gz tomcat8