linux基础之vim快速入门

linux基础之vim快速入门_基本linux vim-CSDN博客https://blog.csdn.net/ypxcan/article/details/119878137?ops_request_misc=&request_id=&biz_id=102&utm_term=vim%E7%BC%96%E8%BE%91%E5%99%A8%E5%A4%8D%E5%88%B6%E7%B2%98%E8%B4%B4%E4%BA%94%E9%81%8D&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduweb~default-1-119878137.142%5Ev100%5Epc_search_result_base3&spm=1018.2226.3001.4187

vi和vim快捷键

快捷键使用练习

拷贝当前行 yy，拷贝当前行向下的5行， 5yy，并粘贴（输入p）
删除当前行 dd，删除当前行下面的5行， 5dd
在文件中查找某个单词[命令行下/关键字，回车查找，输入n就是查找下一个]
设置文件的引号，取消文件的行号[命令行下 :set nu 和 :set nonu]

 ./mycod
0:Success
1:Operation not permitted
2:No such file or directory
3:No such process
4:Interrupted system call
5:Input/output error
6:No such device or address
7:Argument list too long
8:Exec format error
9:Bad file descriptor
10:No child processes
11:Resource temporarily unavailable
12:Cannot allocate memory
13:Permission denied
14:Bad address
15:Block device required

打印错误码

cat mycod.c
#include<stdio.h>
#include<string.h>
int main(int argc,char* argv[],char* env[])
{//int i=0;extern char** environ;//for(i = 0; i<argc; i++)//for(i = 0;env[i]; i++)//for(int i=0;environ[i];i++)for(int i=0;i<100;i++){//printf("argv[%d] -> %s\n",i,argv[i]);//printf("env[%d]:%s\n",i,env[i]);//printf("%d:%s\n",i,environ[i]);printf("%d:%s\n",i,strerror(i));}return 0;
}

echo $?
0

 进程如何退出？

1.main函数调用return返回

2.任意地方调用exit（）

3._exit()

exit:终止进程，主动刷新缓冲区

_exit:                不会刷新缓冲区

ps ajc | head -1PPID    PID   PGID    SID TTY       TPGID STAT   UID   TIME COMMAND

ps ajx | head -1 && ps axj | grep mytestPPID    PID   PGID    SID TTY       TPGID STAT   UID   TIME COMMAND2413  27283  27282   2104 pts/0     27282 R+    1000   0:00 grep --color=auto mytest

将grep进程去除：

ps ajx | head -1 && ps axj | grep mytest | grep -v grepPPID    PID   PGID    SID TTY       TPGID STAT   UID   TIME COMMAND