通过利用“os”模块、“psutil”库和“子流程”模块，我们将为自己配备一个多功能工具包来解决这项势在...
exit命令用于终止当前脚本的执行,并向 Shell 返回一个退出值。 $ exit 1. 上面命令中止当前脚本,将最后一条命令的退出状态,作为整个脚本的退出状态。 exit命令后面可以跟参数,该参数就是退出状态。 # 退出值为0(成功) $ exit 0 # 退出值为1(失败) $ exit 1 1. 2. 3. 4. 5. 退出时,脚本会返回一个...
Bash functions differ from most programming languages when it comes to returning a value from a function. By default, bash returns the exit status of the last executed command in the function's body. The script below shows how to specify the exit status using return: 1. Create a script and...
Return is a bash builtin function that causes to update the exit status specified by n. Return is intended to be used only for signaling errors, not for returning the results of function. If used: inside a function. Return value specified by n.
读取返回码 一般的程序/命令在执行结束时都会返回一个 返回码,比如 java的system.exit(-1) python的sys.exit(-1) 还有上面Shell脚本中的最后一行exit 0 如果你不显式指定返回码.../hi.sh: line 6: duu: command not found duu -s的返回码为 127 返回码配上if判断,就可以使用shell脚本自由得在各个语言...
bashtrap(){ echo "CTRL+C Detected !...executing bash trap !"}# for loop from 1/10 to 10/10for a in `seq 1 10`; do echo "$a/10 to Exit." sleep 1;doneecho "Exit Bash Trap Example!!!" 8. Arrays 8.1. Declare simple bash array...
The return status (see Section 3.7.5 [Exit Status], page 38) of a simple command is its exit status as provided by the posix 1003.1 waitpid function, or 128+n if the command was terminated by signal n. 一个简单命令的返回状态是由posix 1003.1标准的waitpid函数提供的退出状态,或者是128+n如...
A bash function can return a value via its exit status after execution. By default, a function returns the exit code from the last executed command inside the function. It will stop the function execution once it is called. You can use the return builtin command to return an arbitrary numb...
# Prints different random integer from 1 to 65536 a=$RANDOM echo $a exit 0 这个程序可以在每次执行的时候随机的打印出一个大小在1 到 65536之间的整数。 3.3 运算符 算术运算符 + - * / % 表示加减乘除和取余运算 += -= *= /= 同 C 语言中的含义 ...
之后进行命令搜索,先后调用如下函数:搜索特殊内置命令find_special_builtin()(此版本的bash包含如下特殊内置命令:break continue : eval exec exit return set unset export readonly shift source . times trap),搜索函数find_function(),搜索内置命令find_shell_builtin()。