#!/bin/bash if [[ $num =~ ^[1-9][0-9]*$ ]] then echo "Number is greater than zero." fi 复制上面的代码片段中,[[ ]] 表示使用正则表达式进行匹配,^[1-9][0-9]*$ 表示匹配一个大于零的数字。如果 $num 匹配成功,就会输出 "Number is greater than zero."。
else块中的代码在if条件为假时执行。 基本语法: if[ condition ];then# commands to be executed if condition is trueelse# commands to be executed if condition is falsefi 示例: #!/bin/bashnum=3if[$num-gt 5 ];thenecho"Number is greater than 5."elseecho"Number is 5 or less."fi 在这个...
百度试题 结果1 题目bash脚本中测试一个值是否大于另一个值应该使用? A. > B. greater-than C. ge D. gt 相关知识点: 试题来源: 解析 D 反馈 收藏
echo "The number is positive." if (( num % 2 == 0 )) then echo "The number is even." else echo "The number is odd." fi else echo "The number is not positive." fi Conclusion The Bash if statement is a fundamental construct that allows you to control the flow of your scripts ...
/bin/bash # Calculate the week number using the date command: WEEKOFFSET=$[ $(date +"%V") % 2 ] # Test if we have a remainder. If not, this is an even week so send a message. # Else, do nothing. if [ $WEEKOFFSET -eq "0" ]; then echo "Sunday evening, put out the ...
if [ $1 -gt 10 ]; then echo "The number is greater than 10." else echo "The number is not greater than 10." fi 在shell中运行脚本并传递参数:bash check_number.sh 15,将输出The number is greater than 10. 这只是一些bash用法的简单示例,bash还提供了许多其他功能和命令,可根据具体需求进行进...
If this variable is unset, or set to a value that is not a number greater than or equal to zero, the shell disables mail checking. MAILPATH A colon-separated list of file names to be checked for mail. The message to be printed when mail arrives in a particular file may be specified...
[ 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...
可以在 if/then 中作占位符: #!/bin/bash condition=5 if [ $condition -gt 0 ] #gt表示greater than,也就是大于,同样有-lt(小于),-eq(等于) then : # 什么都不做,退出分支 else echo "$condition" fi 变量扩展/子串替换 在与> 重定向操作符结合使用时,将会把一个文件清空,但是并不会修改这个文件...
Enter a number:8 linuxhint@:~$ Example 3: If statement in bash on less than a number In addition to-eqfor equality you can also try-lt -le -gt -getest conditions for less than, less than or equal, greater than or greater then or equal respectively. Below is a similar example with...