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 comparisons. Expressions are formed from the following unary or binary primaries. ...
-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 $value ]]命令可以正确判断到value变量值不是空字符...
-bash: conditional binary operator expected -bash: syntax error near `\>' 可以看出,使用转义后出现error 5.[[]]中"=="与"=~"的使用 引用《advanced bash-scripting guide》对两者的解释 == String comparison operator <==字符串比较 =~ Regular Expression match operator <==正则表达式匹配 但是在此也...
yes [root@mghuee~chunlanyy testdir]# [[ a \>1]] &&echoyes ||echono-bash: conditional binary operator expected-bash: syntax error near `\>' 可以看出,使用转义后出现error 5.[[]]中"=="与"=~"的使用 引用《advanced bash-scripting guide》对两者的解释 == String comparison operator <==字...
Using a Bash If Statement with Conditional Expressions Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && ...
-bash: conditional binary operator expected -bash: syntax error near `=~' [root@smsgw root]# 使用sed -n /re/p 来判断字符串是否数字串 格式:[ "$(sed -n "/^[0-9]\+$/p" <<< "$STR")" ] 格式:[ "$(echo "$STR" | sed -n "/^[0-9]\+$/p")" ] ...
-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 (-) before nodes."; return ...
-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 ...
bash: conditional binary operator expected bash: syntax error near `""' $ [[ -z "" ]]&&echo true||echo false true 4.3` `.``.``.` `进行算术扩展,而[ ... ]不做 $ [[ 99+1 -eq 100 ]]&&echo true||echo false true $ [ 99+1 -eq 100 ]&&echo true||echo false ...
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...