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출력을 파일로 리디렉션하면 테이블이 생성되는 이유는 무엇입니까?

tag-icon • tag-icon pipe io-redirection curl
출력을 파일로 리디렉션하면 테이블이 생성되는 이유는 무엇입니까?

정기적으로 측정값을 기록하도록 cron 작업을 설정하고 싶습니다. 라우터에 설치된 USB 스틱:

user@router:/tmp/home/root# uname -a

Linux 라우터 2.6.36.4brcmarm #2 SMP PREEMPT Sun Mar 20 16:06:18 EDT 2016 armv7l GNU/Linux

user@router:/tmp/home/root# curl http://THERMOSTAT/tstat/humidity  >> /tmp/mnt/USBstick/CT80_data/C14HumidityData.txt

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    18    0    18    0     0     80      0 --:--:-- --:--:-- --:--:--    83

파일에 출력을 추가(>>)하면 위의 테이블이 생성되는 이유는 무엇입니까?

다음을 추가하지 않으면 테이블이 생성되지 않습니다.

curl http://THERMOSTAT/tstat/humidity
{"humidity":51.00}

테이블 응답을 억제하는 명령 옵션이 있습니까?

답변1

이건 곱슬이야일정. ~에서man curl

PROGRESS METER
   curl  normally displays a progress meter during operations, indicating the
   amount of transferred data, transfer speeds and estimated time left,  etc.
   The  progress  meter  displays number of bytes and the speeds are in bytes
   per second. The suffixes (k, M, G, T, P) are 1024 based. For example 1k is
   1024 bytes. 1M is 1048576 bytes.

   curl  displays this data to the terminal by default, so if you invoke curl
   to do an operation and it is about to write data to the terminal, it  dis‐
   ables  the  progress meter as otherwise it would mess up the output mixing
   progress meter and response data.

   If you want a progress meter for HTTP POST or PUT requests,  you  need  to
   redirect  the  response  output  to  a file, using shell redirect (>), -o,
   --output or similar.

   It is not the same case for FTP upload as that operation does not spit out
   any response data to the terminal.

   If  you  prefer  a  progress  "bar"  instead  of  the  regular  meter, -#,
   --progress-bar is your friend. You can also  disable  the  progress  meter
   completely with the -s, --silent option.

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