Nested-if-statement-examples-bash-script Case Statement Case 语句类似于 if 语句,但带有多个 elif。bash 脚本中的 Case 语句展开表达式,然后尝试找到与所有模式的匹配。当找到匹配时,将执行所有语句,直到双分号 “;;”。如果没有找到匹配,则将执行 “*)” 模式下提到的语句。 Syntax : case expression in pat...
注意，test是一个外部程序，需要衍生出对应的进程，而[是Bash的一个内部函数，因此后者的执行效率更高。
/bin/bash># This script is a value test for 1 and 2>#2016-0828 author chawan>#>if[1-lt2];then>echo"2 is bigger">fi>EOF[root@localhost test]# chmod +x if11[root@localhost test]# ./if112is bigger 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. ……… if双分支语句 双...
The main advantage of using ‘else if’ in bash scripting is that it allows your scripts to handle multiple conditions, making them more flexible and powerful. However, it’s important to be aware of potential pitfalls. For instance, the order of your conditions matters. The script will execu...
The if in a Bash script is a shell keyword that is used to test conditions based on the exit status of a test command. An exit status of zero, and only zero, is a success, i.e. a condition that is true. Any other exit status is a failure, i.e. a condition that is false. ...
/bin/bash # 开启调试模式set -x # 脚本内容echo "Hello, World!"...常见问题及解决方法问题1:脚本没有执行解决方法:确认脚本具有可执行权限:chmod +x myscript.sh 确认 Shebang 行正确:#! 10010 【shell脚本】$ 在shell脚本中的使用 shell脚本中 '$' 与不同的符号搭配其表示的意义也会不同特殊标志符 ...
/bin/bash read -p "请输入一个整数: " num if [ "$num" -gt 0 ] && [ "$num" -lt 100 ]; then echo "输入的数在1到99之间" elif [ "$num" -eq 0 ] || [ "$num" -ge 100 ]; then echo "输入的数不在1到99之间" else echo "输入无效,请输入一个整数" fi...
/bin/bash # This script prints a message about your weight if you give it your # weight in kilos and hight in centimeters. if [ ! $# == 2 ]; then echo "Usage: $0 weight_in_kilos length_in_centimeters" exit fi weight="$1"...
,p Q 现在对有问题的文件运行它。 ed -s file.txt < script.ed 从脚本中删除,p,以使stdout的输出静音,或者如果您对输出满意的话。 如果需要in-place编辑,请从脚本中将Q更改为w。 应该给出与bash解决方案大致相同的结果,但是由于仍然不知道在第233行和第238行应该发生什么,所以该行以#EXTVLCOPT开头...
如果if语句后放入一个不能工作的命令,则状态码为非0,且bash shell会跳过then后面的语句。 [22:43:53 root@libin3 libin]# vim shell21 /bin/bash #this is result error if libin then echo "this is error" fi if date then echo "this is success" ...