linux命令行历史记录搜索，然后再执行

1．可以按一下上＼下方向键，命令行就会显示相对于当前命令的上一条或下一条历史记录．

2．和方向键相同功能的就是组合键Ctrl+

p

（前面执行过的命令）,Ctrl

+n（后面执行过的命令）．

2．上面两个都是相对于当前命令查询上一条或者下一条命令的历史记录．如果搜索命令历史记录，

就用Ctrl+

r

组合键进入历史记录搜寻状态，然后，键盘每按一个字母，当前命令行就会搜索出命令历史记录．

在Unix/Linux下，并没有提供int kbhit(void)这个函数。在linux下开发控制台程序时，需要自己编写kbhit()实现的程序了。下面是kbhit在Unix/Linux下的一个实现。用到了一种终端 *** 作库termios。下面是头文件kbhit.h：QUOTE:#ifndef KBHITh#define KBHIThvoid init_keyboard(void)void close_keyboard(void)int kbhit(void)int readch(void)#endif下面式源程序kbhit.c：QUOTE:#include "kbhit.h"#include <stdio.h>#include <termios.h>static struct termios initial_settings, new_settingsstatic int peek_character = -1void init_keyboard(){tcgetattr(0,&initial_settings)new_settings = initial_settingsnew_settings.c_lflag &= ~ICANONnew_settings.c_lflag &= ~ECHOnew_settings.c_lflag &= ~ISIGnew_settings.c_cc[VMIN] = 1new_settings.c_cc[VTIME] = 0tcsetattr(0, TCSANOW, &new_settings)}void close_keyboard(){tcsetattr(0, TCSANOW, &initial_settings)}int kbhit(){unsigned char chint nreadif (peek_character != -1) return 1new_settings.c_cc[VMIN]=0tcsetattr(0, TCSANOW, &new_settings)nread = read(0,&ch,1)new_settings.c_cc[VMIN]=1tcsetattr(0, TCSANOW, &new_settings)if(nread == 1) {peek_character = chreturn 1}return 0}int readch(){char chif(peek_character != -1) {ch = peek_characterpeek_character = -1return ch}read(0,&ch,1)return ch}

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