查看man bash 的CONDITIONAL EXPRESSIONS小节,对条件表达式说明如下: Conditional expressions are used by the [[ compound command and the test and [ builtin commands to test file attributes and perform string and arithmetic co
-bash: test: test: binary operator expected $ [[ -n "test string" ]]; echo $? 0 $ [[ -n test string ]] -bash: syntax error in conditional expression -bash: syntax error near 'string' 可以看到,value变量对应的字符串带有空格,[[ -n $value ]]命令可以正确判断到value变量值不是空字符...
SS-04:~ # _enable 1 -bash: conditional binary operator expected -bash: syntax error near `^-' 相关讨论 如果你只是在函数内部删除它,为什么在参数中需要连字符? 你真的不需要别名和所有引用逃脱。 只需这个功能就足够了: 12345 _enable() { [[ $1 == -* ]] || { echo"Use hyphen (-) ...
yes [root@mghuee~chunlanyy testdir]# [[ a \>1]] &&echoyes ||echono-bash: conditional binary operator expected-bash: syntax error near `\>' 可以看出,使用转义后出现error 5.[[]]中"=="与"=~"的使用 引用《advanced bash-scripting guide》对两者的解释 == String comparison operator <==字...
Using a Bash If Statement with Conditional Expressions Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && ...
-bash: conditional binary operator expected -bash: syntax error near `\>' 1. 2. 3. 4. 5. 可以看出,使用转义后出现error 5.[[]]中"=="与"=~"的使用 引用《advanced bash-scripting guide》对两者的解释 == String comparison operator <==字符串比较 ...
我想在这样的if语句中测试Bash函数的返回值:但是我收到了一些错误消息,比如:conditional binary operator expected怎样才是正确的方法? if [[ $(func arg) ]] ; then ... 浏览12提问于2011-06-05得票数 87 回答已采纳 1回答 Vim中Bash脚本的访问返回值 、、、 我希望在我的.vimrc中有一个函数,它将运行...
There’s also the NOT operator!, which inverts the value of any conditional expression. The NOT operator turns true expressions into false expressions and vice-versa. Let’s take a look at a few examples using the NOT operator: [[7-gt2]]&&echot||echof[[!7-gt2]]&&echot||echof[[6...
问Bash: if语句中的复杂命令EN版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站...
More complex shell commands are composed of simple commands arranged together in a variety of ways: in a pipeline in which the output of one command becomes the input of a second, in a loop or conditional construct, or in some other grouping. ...