shell 逻辑判断

|| &&

---

 

查了 Stack Overflow

• ||，表示或，从前往后执行，执行第一个真
• &&，前者是真才会接着执行
• ; 表示接着往下执行，不管前者如何

#!/bin/bash

false || echo "Oops, fail"
# Oops, fail
true || echo "Will not be printed"
#
true && echo "Things went well"
# Things went well
false && echo "Will not be printed"
#
false ; echo "This will always run"
# This will always run