如何在Shell中判断一个变量是否为整数

可以使用字符串过滤出非0到9之间的字符。
[root@managevm1 ~]# a=123
[root@managevm1 ~]# echo $a | grep "[^0-9]" && echo "a isn't an integer" \
|| echo "a is an integer"
a is an integer
[root@managevm1 ~]# a=123.4
[root@managevm1 ~]# echo $a | grep "[^0-9]" && echo "a isn't an integer" \
|| echo "a is an integer"
a isn't an integer
也可以写为
[root@managevm1 ~]# echo $a | grep -v "[0-9]*" && echo "a isn't an integer"\
|| echo "a is an integer"

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