shell-整数测试多范例多生产案例举例

1. 整数测试举例
范例1：整数条件测试举例

root@test-1 ~]# a1=10;a2=13
[root@test-1 ~]# echo $a1 $a2
10 13
[root@test-1 ~]# [ $a1 -eq $a2 ] && echo 1 || echo 0   #条件不成立，返回为0
0
[root@test-1 ~]# [ $a1 -gt $a2 ] && echo 1 || echo 0
0
[root@test-1 ~]# [ $a1 -lt $a2 ] && echo 1 || echo 0
1
[root@test-1 ~]# [ $a1 -le $a2 ] && echo 1 || echo 0
1
[root@test-1 ~]# [ $a1 -ge $a2 ] && echo 1 || echo 0
0
[root@test-1 ~]# [ $a1 -ne $a2 ] && echo 1 || echo 0
1
[root@test-1 ~]# a=0001
[root@test-1 ~]# b=100
[root@test-1 ~]# [ "$a" -ge "$b" ] && echo 1 || echo 0
0
[root@test-1 ~]# [ "$a" -le "$b" ] && echo 1 || echo 0
1

  范例2：直接通过数学运算符比较

[root@test-1 ~]# a1=10;a2=13
[root@test-1 ~]# echo $a1 $a2
10 13
[root@test-1 ~]# [[ "$a1" = "$a2" ]] && echo 1 || echo 0    #功能同上，条件不成立，返回0
0
[root@test-1 ~]# [[ "$a1" == "$a2" ]] && echo 1 || echo 0   #功能同上，条件不成立，返回0
0
[root@test-1 ~]# (( "$a1" > "$a2" )) && echo 1 || echo 0
0
[root@test-1 ~]# [ "$a1" > "$a2" ] && echo 1 || echo 0    #没报错，但结果不对
1
[root@test-1 ~]# [ "$a1" \> "$a2" ] && echo 1 || echo 0   #加转义或用[[ ]]
0
[root@test-1 ~]# [[ "$a1" > "$a2" ]] && echo 1 || echo 0
0

提示："=" 和 "==" 也可以用于[ ] 中。
[root@test-1 ~]# (( "$a1" < "$a2" )) && echo 1 || echo 0
1
[root@test-1 ~]# (( "$a1" > "$a2" )) && echo 1 || echo 0
0