Yocto 使用之技巧

https://www.kancloud.cn/digest/yocto/138624

subnet

http://www.subnet-calculator.com

rfkill

https://askubuntu.com/questions/98702/how-to-unblock-something-listed-in-rfkill

MQTT

http://www.xappsoftware.com/wordpress/2014/10/30/install-mosquitto-on-mac-os-x/
https://www.jianshu.com/p/a356fd3340f3

grep

ifconfig wlan0 | grep 'HWaddr' |  sed 's/^.*HWaddr //g'

把test換成good!
答案就是底下的指令!
find *.c | xargs -i sed -i 's/test/good/g' {}

CURL

curl -C - -L -v -O --retry 999 -S 
"http://www.archive.org/download/usgs_drg_nc_35077_b1/o35077b1.tif"

CURL *curl; CURLcode res; struct curl_slist *headers=NULL; // init to NULL is important headers = curl_slist_append(headers, "Accept: application/json"); curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "http://web.com/api/json/123");//cant get json file curl_easy_setopt(curl, CURLOPT_URL, "http://web.com/pages/123.html");//this returns entire webpage curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(curl, CURLOPT_RETURNTRANSFER, true); res = curl_easy_perform(curl); if(CURLE_OK == res) { char *ct; // ask for the content-type res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct); if((CURLE_OK == res) && ct) printf("We received Content-Type: %s\n", ct); } } // always cleanup curl_easy_cleanup(curl);

PID

https://www.cyberciti.biz/faq/linux-pidof-command-examples-find-pid-of-program/

#!/bin/bash # please ignore our pid and get all pids of lighttpd on server list=$(pidof -o %PPID lighttpd)   # .. now do something on all pids stored in $list for p in $list do echo "Killing $p..." kill -TERM $p done