于是,在x不等于0的情况下,我们会看到程序输出x does not equal 0。 还有一种改法是把else...分支跟第二个if()...括在一起,以便明确地同第二个if()...关联起来。这会让程序在x为0且y不为0的情况下输出y does not equal 0。依照这种写法,第一个(外面那个)if()...结构没有false分支: 注意,这种写...
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-eqequal，检测两个数是否相等，相等返回 true。[ $a -eq $b ] 返回 false。-nenot equal，检测...
:begin @echo off format a: /s if not errorlevel 1 goto end echo An error occurred during formatting. :end echo End of batch program. If no error occurs, the error message does not appear. You cannot use the if command to test directly for a directory, but the null (NUL) device doe...
The >= operator means "greater or equal to". As a result, you can compare total to a value of 15 rather than 14. With these changes, the expression that you use to evaluate a winning roll now resembles the expression that you evaluate for a losing roll. This should help to make ...
If you think this does not apply to you, then here is a simple test to show you are wrong. 出自-2017年6月听力原文 Whether this is right, and if so where and when the ecological axe will fall, is hard to determine with any precision—which is why governments and financial institutions...
[ FILE1 -nt FILE2 ] 如果 FILE1 has been changed more recently than FILE2, or 如果 FILE1 exists and FILE2 does not则为真。 [ FILE1 -ot FILE2 ] 如果 FILE1 比 FILE2 要老, 或者 FILE2 存在且 FILE1 不存在则为真。 [ FILE1 -ef FILE2 ] 如果 FILE1 和 FILE2 指向相同的设备和节...
AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
echo “b is not equal to 20.” else echo “b is equal to 20.” fi “` 3. 大于判断(-gt) 使用`-gt`运算符可以判断一个数值是否大于另一个数值。例如,以下代码判断变量`c`是否大于30: “`bash #!/bin/bash c=40 if [ $c -gt 30 ] ...