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SHELL: 2.0 多判断条件的 if 语句和简化写法的 if 语句

28 Sep 2019

0. if语句，单纯只是多判断条件

if [ condition1 ] && [ condition2 ] || [ condition3 ]
then
	#statements
elif [ condition ]
then
	#statements
else
	#statements
fi

1. if语句，嵌套多判断条件

if ([ condition1 ] && [ condition2 ]) || ([ condition3 ] || [ condition4 ])
then
	#statements
elif [ condition ]
then
	#statements
else
	#statements
fi

2. if语句，简要写法和复杂判断条件

# 如果没有elif和else，可以用下面的语句简化if语句
[[ condition1 ]] && statements

# 如果是多个判断条件和多个后续语句
([[ condition1 ]] && [[ condition2 ]]) || ([[ condition3 ]] || [[ condition4 ]]) && (
	statement1;
	statement2;
	statement3)