シェル芸160ノック28

9月末に発売されたシェル芸本の続きです。

gihyo.jp

前回はこちら

xztaityozx.hatenablog.com

問題151

$ curl http://file.ueda.tech/eki/l/11302.xml > a
$ cat a | grep -Pe "lon|lat|name" | sd '<[^>]+>' '' | awk '{print $1}' | xargs -n3 | while read D E F; do echo $D $(curl "https://cyberjapandata2.gsi.go.jp/general/dem/scripts/getelevation.php?lon=$E&lat=$F" | jq -r '.elevation'); sleep 1s; done

問題152

$ while true; do command wget localhost:8000/index.html  |& grep 200 &> /dev/null && echo Success || echo Warning; sleep 1s; done
Success
Success
Success
...

問題153

$ (echo -e "HEAD / HTTP/1.1\nHost: www.google.co.jp\n\n";sleep 1s) | telnet www.google.co.jp 80

問題154

$ echo wget curl ping dig nslookup | fmt -1 | while read CMD; do sudo strace -f $CMD google.com |& grep /etc/hosts && echo $CMD; done

問題155

$ echo -n test > index.html&&python3 -m http.server
$ curl localhost:8000 -v
*   Trying 127.0.0.1:8000...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8000 (#0)
> GET / HTTP/1.1
> Host: localhost:8000
> User-Agent: curl/7.68.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Server: SimpleHTTP/0.6 Python/3.9.0
< Date: Tue, 21 Dec 2021 12:52:52 GMT
< Content-type: text/html
< Content-Length: 4
< Last-Modified: Tue, 21 Dec 2021 12:52:51 GMT
<
* Closing connection 0
test

$ (echo -e "HTTP/1.1 200 OK\nContent-Length: 5";echo -en "\ntest") | nc -N -l 8080