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1.wifi 켜기

# ifconfig wlan0 up

# ifconfig

wlan0 Link encap:Ethernet HWaddr 58:86:94:F7:68:56

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

 

 

2.wifi 검색

# iwlist wlan0 scanning | more

Cell 08 - Address: 70:5D:CC:D6:70:C4

ESSID:"iptime"

Protocol:IEEE 802.11bgn

Mode:Master

Frequency:2.442 GHz (Channel 7)

Encryption key:off -> 암호사용 여부

Bit Rates:300 Mb/s

IE: Unknown: DD7A0050F204104A00011010440001021041000100103B000103104700104D73C5C27E6B5243D6440AAB1719670B10210006697054494D4510230008697054494D4541501024000A31323334353637383930104200033336301054000800060050F204000110110008697054494D454150100800020084103C000101

Quality=36/100 Signal level=60/100

Extra:fm=0003

 

3.wifi 연결

(ESSID이름이 iptime이라면)

# iwconfig wlan0 essid "iptime" 또는 iw dev wlan0 connect iptime

4.wifi 연결 상태 확인

# iw wlan0 link

Connected to 70:5d:cc:d6:70:c4 (on wlan0)

SSID: iptime

freq: 2427

signal: -40 dBm

tx bitrate: 150.0 MBit/s

 

5.wifi ip 할당

# dhcpcd wlan0

DUID 00:01:00:01:28:01:2d:a0:02:e2:e4:67:2a:e4

wlan0: IAID 94:f7:68:56

wlan0: soliciting a DHCP lease

wlan0: soliciting an IPv6 router

wlan0: offered 192.168.0.7 from 192.168.0.1

wlan0: probing address 192.168.0.7/24

wlan0: leased 192.168.0.7 for 7200 seconds

wlan0: adding route to 192.168.0.0/24

wlan0: adding default route via 192.168.0.1

forked to background, child pid 25434

 

6.인터넷 연결 테스트

# ping www.google.co.kr

PING www.google.co.kr (172.217.31.163): 56 data bytes

64 bytes from 172.217.31.163: seq=0 ttl=52 time=40.399 ms

64 bytes from 172.217.31.163: seq=1 ttl=52 time=35.684 ms

 

7.wifi ip 연결 정보

# ip a 또는 ip addr show

15: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq qlen 1000

link/ether 58:86:94:f7:68:56 brd ff:ff:ff:ff:ff:ff

9.기타 명령어

    • wifi ip 연결 정보

# wpa_cli status

Selected interface 'wlan0'

bssid=70:5d:cc:d6:70:c4

freq=2427

ssid=iptime

id=0

id_str=school

mode=station

pairwise_cipher=CCMP

group_cipher=CCMP

key_mgmt=WPA2-PSK

wpa_state=COMPLETED

ip_address=192.168.0.7 : 외부와 통신이 안될 때는 ip_address가 보이지 않는다.

p2p_device_address=58:86:94:f7:68:56

address=58:86:94:f7:68:56

uuid=f97f4363-d017-5f52-8af7-63941e8d1418

 

 

    • wifi ip 연결 정보

# ip r

default via 192.168.0.1 dev wlan0 src 192.168.0.7 metric 304

192.168.0.0/24 dev wlan0 src 192.168.0.7 metric 304

 

    • wifi 특정 공유기 grep

# iwlist wlan0 scanning | grep ESSID:\"iptime\" -A9

ESSID:"iptime"

Protocol:IEEE 802.11bgn

Mode:Master

Frequency:2.427 GHz (Channel 4)

Encryption key:off

Bit Rates:300 Mb/s

IE: Unknown: DD7A0050F204104A00011010440001021041000100103B000103104700104D73C5C27E6B5243D6440AAB1719670B10210006697054494D4510230008697054494D4541501024000A31323334353637383930104200033336301054000800060050F204000110110008697054494D454150100800020084103C000101

Quality=91/100 Signal level=63/100

Extra:fm=0003

 

    • wifi 동작상태

# cat /sys/class/net/wlan0/operstate

동작상태에 따라 down 또는 up이라고 표시됨

 

    • wifi 검색

# iwlist wlan0 scanning | more

 

    • wifi 하드웨어 검색

# iw dev

phy#11

Interface wlan0

ifindex 15

wdev 0xb00000001

addr 58:86:94:f7:68:56

type managed

 

    • wifi 상태 검색

# iwconfig

wlan0 unassociated Nickname:"<WIFI@REALTEK>"

Mode:Managed Frequency=2.412 GHz Access Point: Not-Associated

Sensitivity:0/0

Retry:off RTS thr:off Fragment thr:off

Encryption key:off

Power Management:off

Link Quality:0 Signal level:0 Noise level:0

Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0

Tx excessive retries:0 Invalid misc:0 Missed beacon:0

 

sit0 no wireless extensions.

 

lo no wireless extensions.

 

eth0 no wireless extensions.

 

 

 

 

//-----------------------------------

1.참고사이트

https://easylinuxtipsproject.blogspot.com/p/realtek.html?m=1

이미지 썸네일 삭제
Realtek wireless chipset: install the right driver

Easy tips, tweaks and tricks for Linux Mint and Ubuntu, both for beginners and for advanced users. Complete starter's guide with simple how-to's.

easylinuxtipsproject.blogspot.com

이미지 썸네일 삭제
Can I get SSID and MAC address from C code in Linux?

I am writing a C backup program for my Majaro Linux. It must backup files at a certain time in my home local server only if I am connecting to my home network. So I need to get an SSID and a MAC ad...

stackoverflow.com

이미지 썸네일 삭제
리눅스 WiFi 연결 명령어 - HiSEON

리눅스 WiFi 연결 명령어 리눅스 서버 등의 환경에서 명령어를 사용하여 WiFi 연결 방법에 대해 설명드립니다. WPA/WPA2 암호화 프로토콜을 사용하는 와이파이와 비밀번호가 없는 WiFi 연결 방법에 대해서 설명드리도록 하겠습니다.

hiseon.me

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1. VSCODE에 plantUML 설치

ctrl+shift+x를 누르고, plantuml로 검색하여 install

 

 

 

 

 

2. 사용법

1) 파일은 확장자를 PlantUML로 저장

 

2) 미리보기: alt+d

3) 저장: VSCODE 에서 F1 ->  PlantUML로 검색 -> Export 선택해서 pdf, 이미지 등 원하는 형식으로 저장

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2차원 배열

int func(char** a)
{
    char b[10][10];
    char B[10][10];
    char c[10];

    memset(b, 0, sizeof(b));
    memcpy(b[3], &c[3], 7);
    sprintf(b[2], "%s", B[0]);

    a[0]= b[0];
    a[1]= b[1];
}

int main(void)
{
    char a[10][10];
    func(a);
}

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