shell脚本报错:"[: =: unary operator expected" 在匹配字符串相等时,我用了类似这样的语句: if [ $STATUS == "OK" ]; then echo "OK" fi 究其原因,是因为如果变量STATUS值为空,那么就成了 [ = "OK"] ,显然 [ 和 "OK" 不相等并且缺少了 [ 符号,所以报了这样的错误。 当然不总是出错,如果变量...
The + operator can also be used for concatenating (joining) two strings together, as shown in the following ConcatDemo program: class ConcatDemo { public static void main(String[] args){ String firstString = "This is"; String secondString = " a concatenated string."; String thirdString =...
The unary minus operator is used to negate a number, and when it is used before a variable, it negates its value. The unary minus operator represents the prefix-sign in C++. You must put the-sign before a number to negate it; for example, if you want to negate 5, you will type ...
int x 5; //error - unary operator expectedThe above code snippet shows an error because there is no binary operation (operator) between two variables. So, if you have such kind of error in your program then you need to check whether all the expressions in your program have at least two...
C# Example of TimeSpan.UnaryPlus(TimeSpan) Operator The source code todemonstrate the unary plus (+) operator with TimeSpan structureis given below. The given program is compiled and executed successfully. usingSystem;classTimeSpanDemo{//Entry point of ProgramstaticpublicvoidMain() { TimeSpan tim...
-ea operator -ErrorAction:SilentlyContinue parameter is not being respected & $error variable not updated -ExpandProperty & Export CSV !!! powershell script to add a word in the beginning of the text file - URGENT !!! 'A positional parameter cannot be found that accepts argument '$null'. ...
5. Bitwise Complement(~) Operator Example Bitwise complement is represented by~ (Tilde)symbol. The bitwise complement is a 1’s complement representation of number. 1’s complement changes the 1’s to 0’s and 0’s to 1’s. For example:In the following java program, we got -8 as a ...
The source code to demonstrate the unary minus (-) operator with TimeSpan structure is given below. The given program is compiled and executed successfully.using System; class TimeSpanDemo { //Entry point of Program static public void Main() { TimeSpan timeInterval = new TimeSpan(4, 10, ...