return (p->status); } 4、和$?汇合 在shell中通过$?来显示前一个命令的执行结果,所以我们看一下这个结果是如何和$?结合在一起的。在execute_command_internal函数的最后,会将waitfor的返回值赋值给全局变量 last_command_exit_value : last_command_exit_value = exec_result; static WORD_DESC * param_exp...
看到输出： appending output to nohup.out 还需要按终端上键盘任意键退回到shell输入命令窗口，然后通过...
*caller_index = i;if(last >= first || last =='$'|| last <0) result = history_arg_extract (first, last, from);return(result ? result : (char*)&error_pointer); } 键盘映射方法 在bash中,默认的 "\e.": insert-last-argument 是插入前一个命令行的最后一个参数,在这个功能的附近,还有...
This problem involves writing a Bash script that defines a function named "divide()" to calculate and return the division of two given numbers. The function should take two arguments, divide the first number by the second, and return the result. The script should also handle the case where ...
The customer is running a pipeline command, when using "echo $?", only the return value of last command could be got, how to get the return value from the second command?Raw # df |awk '{print $5}' |grep /mnt 2>&1 | tee ./log; echo $? 1 Environment Red Hat Enterprise ...
last yourUsername 1. o.ps 列出您的进程。 ps -u yourusername 1. p.kill 使用您所提供的ID杀死(结束)进程。 kill PID 1. q.killall 用名称杀死所有进程。 killall processname 1. r.top 显示当前活动的进程。 s.bg 列出停止的或后台工作的Job; 恢复在后台停止的Job。
last_command_exit_value = exec_result; ... return (last_command_exit_value); } 在函数execute_command_internal()中,根据参数command的类型command->type,分别调用不同的命令执行函数,并返回命令的退出码。 此时函数的调用关系为:main()-->reader_loop()-->execute_command()-->execute_command_internal...
${Variable:0:Length}# 这样会仅返回变量值的前7个字符# 变量的默认值echo ${Foo:-"DefaultValueIfFooIsMissingOrEmpty"}# 对 null (Foo=) 和空串 (Foo="") 起作用； 零（Foo=0）时返回0# 注意这仅返回默认值而不是改变变量的值# 内置变量：# 下面的内置变量很有用echo "Last program return value:...
ESC-F Like F, but as soon as a line is found which matches the last search pattern, the terminal bell is rung and forward scrolling stops. g or < or ESC-< Go to line N in the file, default 1 (beginning of file). (Warning: this may be slow if N is large.) ...
the input source has already been initialized. */intreader_loop(){...if(read_command()==0){...}elseif(current_command=global_command){...execute_command(current_command);}...return(last_command_exit_value);} reader_loop()函数中调用read_command()取得命令结构体global_command,然后赋值给cur...