then declare a variable named "val" with a string value of "Aqsa". Inside the "if" statement, set a condition to check if the string value of variable $val is not equal to "Aqsa". If this condition is met, the first echo statement...
在 Python 中，我们可以使用反转和比较列表、使用 zip（） 函数、将列表转换为字符串等方法检查两个列表...
arg1 OP arg2 : OP是-eqequal、-nenot-equal、-ltless-than、-leless-than-or-equal、 -gtgreater-than 、-gegreater-than-or-equal的其中之一。 *在Bash中,当错误发生在致命信号时,bash会返回128+signal number做为返回值。如果找不到命令,将会返回127。如果命令找到了,但该命令是不可执行的,将返回126...
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...
if [ $? -eq 0 ]; then: This checks if the exit status of the previous command (sort) is equal to 0, which indicates success. echo "Duplicate lines removed successfully. Result saved to unique_data.txt.": If the exit status is 0, it prints a success message indicating that duplicate...
[ ARG1 OP ARG2 ] “OP” is one of -eq, -ne, -lt, -le, -gt or -ge. These arithmetic binary operators return true if “ARG1” is equal to, not equal to, less than, less than or equal to, greater than, or greater than or equal to “ARG2”, respectively. “ARG1” and “AR...
if[[$USER='username']];thenecho"true"elseecho"false"fi not equal:!= numeric equality:-eq not equals:-ne is empty:-z if[[1-eq1]];if[[-z$USER]]; Elif if[[-z$USER]];thenecho"user is empty"elif[[1-eq1]];thenecho"1==1"elseecho"false"fi ...
bash shell 需知,shell技巧(一)等于:equalto不等于:unequalto大于:greater小于:lessthan1.test测试命令test命令用于检查某个条件是否成立,它可以进行数值、字符和文件三个方面的测试,其测试符和相应的功能分别如下:(1)数值测试:-eq:等于则为真-ne:不等于则为真
-ne is a comparison operator for "not equal". $0 represents the name of the script itself. exit 1 terminates the script with a non-zero exit code indicating an error. 5. Check for Command Existence: Write a Bash script that checks if a command (e.g., "gcc") exists on the system....
#Check if salary and expenses are not equal elif [ $salary != $expenses ]; then echo "Salary and expenses are not equal" fi This script creates two new variables and compares whether they are equal or not. 10. Functions A bash function is a set of commands that can be reused numerous...