所以一般来说,我把程序叫做"if!"类型语句。通过从行号中减去1,别名将告诉我失败发生的位置。打电话也很简单,而且很容易证明自己是白痴。下面是一个例子(只需用您要调用的内容替换/bin/false)。12345 #This is an example useage, it will print out #Error prog-name (@1): Who knew false is false. if...
$n, corresponding to the position of the parameter after the function’s name.# The $0 variable is reserved for the function’s name.# The $# variable holds the number of positional parameters/arguments passed to the function.# The $* or $@ variable holds all positional parameters/arguments ...
This is similar to the above method but uses the*variable. The only difference is that it stores the entire parameter as a single string. It still gets you the same result in most cases though. To use this method, you will have to echo the*variable as shown: echo $* Once you do tha...
To retrieve the array you need to useparameter expansion, which involves the dollar sign and curly brackets (${ }). The positions of the elements in the array are numbered starting from zero. To get the first element of this array use${plagues[0]}like so: echo${plagues[0]} ## blood...
"$@": Special parameter that expands to the positional parameters, starting from one. let arg_count++: Increments the counter for each argument. if [ $arg_count -ne 2 ]: Checks if total number of arguments passed to script is not equal to 2. This script iterates over all the agrument...
# Pass parameter to function A function_A "Function A." function_B # Pass parameter to function C function_C "Function C." function_D 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
出现此问题的原因是二进制程序 ifconfig 不在用户定义的 PATH 变量中。但是,如果知道此命令的完整路径,就可以像 清单 4 这样执行它。 清单4. 使用命令的完整路径解决 bash shell 中的 $PATH 问题 [fred.smythe@server01~]$/sbin/ifconfig -a eth0 Linkencap:Ethernet HWaddr00:50:56:96:2E:B3 ...
Bash can’t declare function parameter or arguments at the time of function declaration. But you can use parameters in function by using other variable. If two values are passed at the time of function calling then $1 and $2 variable are used for reading the values. Create a file named ...
# Must call script with at least one integer parameter #+ (number of concurrent processes). # All other parameters are passed through to the processes started. INDICE=8 # Total number of process to start TEMPO=5 # Maximum sleep time per process E_BADARGS=65 # No arg(s) passed to scri...
Function arguments_get_parameterarguments.get_parameter parameter [parameter_aliases...] variable_name Sets variable_name to the field following parameter (or one of the parameter_aliases) from the argument array (see arguments.set).Examplearguments.get_parameter --log-level -l loglevel ...