在Bash脚本中,条件可以是各种各样的表达式,比如判断两个变量是否相等,判断一个文件是否存在,或者判断一个命令的返回值是否为0。下面是一些常见的条件表达式的示例: ```bash # Check if two variables are equal if [ $var1 -eq $var2 ] then echo "Variables are equal" else echo "Variables are not equa...
true if the Strings are equal, case sensitive, or both null org.apache.commons.lang.StringUtils equalsIgnoreCase方法 写道 public static boolean equalsIgnoreCase(String str1, String str2) Compares two Strings, returning true if they are equal ignoring the case. nulls are handled without exceptions. ...
局部变量(local variables):这种变量只有在变量所在的代码块或者函数中才可见,需要使用local声明; 全局变量:Bash中用户自定义的普通变量默认是全局变量,可以在本文件中的其它位置引用; 环境变量(environmental variables):所有的程序(包括shell启动的程序)都能访问环境变量。 如果一个shell脚本设置了环境变量,需要用 export...
Double quotes in bash will suppress special meaning of every meta characters except "$", "\" and "`". Any other meta characters will be read literally. It is also possible to use single quote within double quotes. If we need to use double quotes within double quotes bash can read them ...
In this example, we have two variables, ‘a’ and ‘b’. The script checks if ‘a’ is equal to ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘b’. If neither condition is met, it executes the ‘else’ statement, which in ...
5.4Logic and If/Else 5.4.1Conditional Execution When writing computer programs it is often useful for your program to be able to make decisions based on inputs like arguments, files, and environmental variables. Bash provides mechanisms for creatinglogical expressionswhich resemble mathematical equations...
These two strings aren't equal However, there are a few traps with the[ $f00 = *ar ]syntax. This is the same as: 但是,[$ f00 = * ar]语法有一些陷阱。这与: test $foo = *ar Which means the shell will interpolate glob expressions and variables before executing the statement. If$fo...
$ bash ifnot.sh Let’s update this code a little bit by adding the same value to both integer variables i.e., v1=14 and v2=14. This time, we have also updated the inner condition for two variables. So, we have been using the “not equal” operator i.e., “-ne” to check ...
value of theTEXTDOMAINshell variable, possibly adding a suffix of ‘.mo’. If you use theTEXTDOMAINvariable, you may need to set theTEXTDOMAINDIRvariable to the location of the message catalog files. Still others use both variables in this fashion:TEXTDOMAINDIR/LC_MESSAGES/LC_MESSAGES/TEXTDOMAIN...
variables, if they appear in the environment, are ignored, and the effective user id is set to the real user id. If the -p option is supplied at invocation, the startup behavior is the same, but the effective user id is not reset. ...