echo "Year $year is leap year" else echo "Year $year is normal year" fi 注意上面双括号[[ ]]的使用。如果你使用逻辑运算符,则这是强制性的。 通过使用不同的数据运行脚本来验证脚本: Example of running bash script with logical operators in if statement ️ 练习时间 让我们做一些练习吧 练习1:...
[student@studentvm1 testdir]$ File="TestFile1" ; rm $File ; if [ -s $File ] ; then echo "$File exists and contains data." ; else echo "$File does not exist or is empty." ; fi TestFile1 does not exist or is empty. 现在创建一个空文件用来测试: [student@studentvm1 testdir]...
EN1.if条件判断语句： if 要判断的条件(True): 条件成立的时候，要做的事情 elif 要判断的...
echo"Year $year is leap year" else echo"Year $year is normal year" fi 💡 注意上面双括号 [[ ]] 的使用。如果你使用逻辑运算符,则这是强制性的。 通过使用不同的数据运行脚本来验证脚本: Example of running bash with logical operators in if statement 🏋️ 练习时间 让我们做一些练习吧 😃 ...
Example of running bash script with logical operators in if statement 🏋️ 练习时间 让我们做一些练习吧 😃 练习1:编写一个 Bash Shell 脚本,检查作为参数提供给它的字符串的长度。如果未提供参数,它将打印 “empty string”。 练习2:编写一个 Shell 脚本来检查给定文件是否存在。你可以提供完整的文件路...
Bash OR Logical Operator Under Logical operators, Bash provides logical OR operator that performs boolean OR operation. Bash boolean OR operator takes two operands and returns true if any of the operands is true, else it returns false.
bash conditional-statements logical-operators 1个回答 51投票 if [[ ! ($var == 2 || $var == 30 || $var == 50) ]] ; then do something fi 一个好的做法是在您的条件操作员和操作数之间拥有空间。 也可能建议,如果您只是比较数字,改用算术运算符,或者只是使用(( )) :: if ! [[ ...
二进制与运算规则:1&1=1 1&0=0 0&0=0 | 或 （只要有1，那么就是1） 表示按位或...
The “if” statement can be used to check the different conditions in Bash. The different types of comparison operators, logical operators, and options are used with the “if” statement for testing. The uses of the “-z” and “-n” option to test the string values using the “if” ...
if [ $num -lt 0 ]; then echo "Number $num is negative" elif [ $num -gt 0 ]; then echo "Number $num is positive" else echo "Number $num is zero" fi Let me run it to cover all three cases here: Combine multiple conditions with logical operators ...