所需的输出：所有大于5的数字。
几次尝试之一：
for i in {1..10}; do if ["$i" > 5]; then echo $i; fi; done
但是输出是：
-bash: [1: command not found
-bash: [2: command not found
-bash: [3: command not found
-bash: [4: command not found
-bash: [5: command not found
-bash: [6: command not found
-bash: [7: command not found
-bash: [8: command not found
-bash: [9: command not found
-bash: [10: command not found
什么不见了？
空间和 -gt
user1@machine:~/tmp$ for i in {1..10}; do if [ $i -gt 5 ]; then echo $i; fi; done
6
7
8
9
10
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