投稿者: chosuke

趣味はゲームやアニメや漫画などです

UNIX パイプ

dotinstall:~ $ ls -l /etc/
total 208
-rw-r–r– 1 root root 7 May 29 2020 alpine-release
drwxr-xr-x 1 root root 4096 Sep 23 2020 apk
drwxr-xr-x 3 root root 4096 Sep 23 2020 ca-certificates
-rw-r–r– 1 root root 5613 Jun 18 2020 ca-certificates.conf
drwxr-xr-x 2 root root 4096 May 29 2020 conf.d
drwxr-xr-x 2 root root 4096 May 29 2020 crontabs
-rw-r–r– 1 root root 89 May 29 2020 fstab
-rw-r–r– 1 root root 693 Sep 23 2020 group
-rw-r–r– 1 root root 682 May 29 2020 group-
-rw-r–r– 1 root root 13 Dec 27 18:11 hostname
-rw-r–r– 1 root root 178 Dec 27 18:11 hosts
drwxr-xr-x 2 root root 4096 May 29 2020 init.d
-rw-r–r– 1 root root 570 May 29 2020 inittab
-rw-r–r– 1 root root 1748 Feb 9 2020 inputrc
-rw-r–r– 1 root root 54 May 29 2020 issue
-rw-r–r– 1 root root 309 Aug 9 2020 localtime
drwxr-xr-x 2 root root 4096 May 29 2020 logrotate.d
drwxr-xr-x 2 root root 4096 May 29 2020 modprobe.d
-rw-r–r– 1 root root 15 May 29 2020 modules
drwxr-xr-x 2 root root 4096 May 29 2020 modules-load.d
-rw-r–r– 1 root root 283 May 29 2020 motd
lrwxrwxrwx 1 root root 12 Dec 27 18:11 mtab -> /proc/mounts
drwxr-xr-x 8 root root 4096 May 29 2020 network
drwxr-xr-x 2 root root 4096 May 29 2020 opt
-rw-r–r– 1 root root 164 May 29 2020 os-release
-rw-r–r– 1 root root 1233 Sep 23 2020 passwd
-rw-r–r– 1 root root 1172 May 29 2020 passwd-
drwxr-xr-x 7 root root 4096 May 29 2020 periodic
-rw-r–r– 1 root root 238 May 29 2020 profile
drwxr-xr-x 1 root root 4096 Sep 23 2020 profile.d
-rw-r–r– 1 root root 1865 May 29 2020 protocols
-rw-r–r– 1 root root 54 Dec 27 18:11 resolv.conf
-rw-r–r– 1 root root 65 May 22 2020 securetty
-rw-r–r– 1 root root 14464 May 29 2020 services
-rw-r—– 1 root shadow 454 Sep 23 2020 shadow
-rw-r—– 1 root shadow 422 May 29 2020 shadow-
-rw-r–r– 1 root root 48 Sep 23 2020 shells
drwxr-xr-x 1 root root 4096 May 29 2020 ssl
-rw-r–r– 1 root root 3941 May 25 2020 sudo.conf
-rw-r–r– 1 root root 6169 May 25 2020 sudo_logsrvd.conf
-rw-r–r– 1 root root 3228 Sep 23 2020 sudoers
drwxr-x— 2 root root 4096 Sep 23 2020 sudoers.d
-r–r—– 1 root root 3174 May 25 2020 sudoers.dist
-rw-r–r– 1 root root 53 May 29 2020 sysctl.conf
drwxr-xr-x 2 root root 4096 May 29 2020 sysctl.d
drwxr-xr-x 13 root root 4096 Sep 23 2020 terminfo
-rw-r–r– 1 root root 5306 May 22 2020 udhcpd.conf
dotinstall:~ $ ls -l /etc/ | grep ‘sudo’
-rw-r–r– 1 root root 3941 May 25 2020 sudo.conf
-rw-r–r– 1 root root 6169 May 25 2020 sudo_logsrvd.conf
-rw-r–r– 1 root root 3228 Sep 23 2020 sudoers
drwxr-x— 2 root root 4096 Sep 23 2020 sudoers.d
-r–r—– 1 root root 3174 May 25 2020 sudoers.dist
dotinstall:~ $ ls -l /etc/ | grep ‘sudo’ | wc -l
5
dotinstall:~ $ ls -l /etc/ | grep ‘sudo’ | wc -l > results.txt
dotinstall:~ $ cat results.txt
5
dotinstall:~ $ rm results.txt
dotinstall:~ $

UNIX リダイレクション

date
dotinstall:~ $ echo ‘cal’ > commands.txt
dotinstall:~ $ cat commands.txt
cal
dotinstall:~ $ echo ‘date’ >> commands.txt
dotinstall:~ $ cat commands.txt
cal
date
dotinstall:~ $ /bin/ash < commands.txt December 2022 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Tue Dec 27 20:04:43 JST 2022 dotinstall:~ $ /bin/ash < commands.txt > results.txt
dotinstall:~ $ cat results.txt
December 2022
Su Mo Tu We Th Fr Sa
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

Tue Dec 27 20:05:01 JST 2022
dotinstall:~ $ rm ‘
>

C# 変数の型

using System;

class MyApp
{

static void Main()
{
// 変数: 再代入が可能
// 定数: 再代入が不可能
string s = “hello”;
char c = ‘a’;

int i = 100;

double d = 52342.34;
float f = 23.3f;

//論理
bool flag = true;

var x = 5;
var y = “world”;
}

}

WindowsAPI　終了処理

#include

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
switch (msg) {
case WM_DESTROY:
MessageBox(hwnd, TEXT(“魔王を倒した”),
TEXT(“勇者の攻撃”), MB_ICONINFORMATION);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, msg, wp, lp);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR lpCndLine, int nCmdShow) {
HWND hwnd;
MSG msg;
WNDCLASS winc;

winc.style = CS_HREDRAW | CS_VREDRAW;
winc.lpfnWndProc = WndProc;
winc.cbClsExtra = winc.cbWndExtra = 0;
winc.hInstance = hInstance;
winc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
winc.hCursor = LoadCursor(NULL, IDC_ARROW);
winc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
winc.lpszMenuName = NULL;
winc.lpszClassName = TEXT(“勇者”);

if (!RegisterClass(&winc))return 0;

hwnd = CreateWindow(
TEXT(“勇者”), TEXT(“勇者の攻撃！”),
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
100, 100, 200, 200, NULL, NULL,
hInstance, NULL
);

if (hwnd == NULL)return 0;

while (GetMessage(&msg, NULL, 0, 0))DispatchMessage(&msg);
return msg.wParam;
}