五.shell流程控制1.一重分支if 语句语法格式:if condition then command1 fi末尾的fi就是if倒过来. 写成一行: if condition; then command1; fi 2.二重分支if else 语法格式:if condition then command1 else commandfi 3.多重分支if else-if else 语法格式:if condition1 then command1elif condition2 then comman