Linux2010. 7. 7. 16:30

쉘스크립트의 stdout / stderr 리다이렉션(redirection c)

글들을 찾아보면
comand > logfile 2>&1
이라고 하면 command를 실행하면서 생기는 출력(stdout)과 에러(stderr)을 logfile로 저장한다고 한다.

하지만, 막상 저장해보면 순서가 뒤죽박죽 되는것으로 보인다.
$ v4l-info /dev/video0 2> v4l.dev0 1>&2
### video4linux device info [/dev/video0] ###
general info
    VIDIOCGCAP
        name                    : "DC10plus[0]"
        type                    : 0x29 [CAPTURE,OVERLAY,CLIPPING]
        channels                : 3
        audios                  : 0
        maxwidth                : 640
        maxheight               : 480
        minwidth                : 48
        minheight ioctl VIDIOCGTUNER: Invalid argument
ioctl VIDIOCGAUDIO: Invalid argument
              : 32

channels
    VIDIOCGCHAN(0)
        channel                 : 0
        name                    : "Composite"
        tuners                  : 0
        flags                   : 0x0 []
        type                    : CAMERA
        norm                    : 1
    VIDIOCGCHAN(1)
        channel                 : 1
        name                    : "S-Video"
        tuners                  : 0
        flags                   : 0x0 []
        type                    : CAMERA
        norm                    : 1
    VIDIOCGCHAN(2)
        channel                 : 2
        name                    : "Internal/comp"
        tuners                  : 0
        flags                   : 0x0 []
        type                    : CAMERA
        norm                    : 1

tuner

audio

picture
    VIDIOCGPICT
        brightness              : 32896
        hue                     : 32896
        colour                  : 33026
        contrast                : 33026
        whiteness               : 0
        depth                   : 16
        palette                 : YUYV

buffer
    VIDIOCGFBUF
        base                    : (nil)
        height                  : 768
        width                   : 1024
        depth                   : 32
        bytesperline            : 4096

window
    VIDIOCGWIN
        x                       : 0
        y                       : 0
        width                   : 0
        height                  : 0
        chromakey               : 0
        flags                   : 0

$ v4l-info /dev/video0
### video4linux device info [/dev/video0] ###
general info
    VIDIOCGCAP
    name                    : "DC10plus[0]"
    type                    : 0x29 [CAPTURE,OVERLAY,CLIPPING]
    channels                : 3
    audios                  : 0
    maxwidth                : 640
    maxheight               : 480
    minwidth                : 48
    minheight               : 32

channels
    VIDIOCGCHAN(0)
    channel                 : 0
    name                    : "Composite"
    tuners                  : 0
    flags                   : 0x0 []
    type                    : CAMERA
    norm                    : 1
    VIDIOCGCHAN(1)
    channel                 : 1
    name                    : "S-Video"
    tuners                  : 0
    flags                   : 0x0 []
    type                    : CAMERA
    norm                    : 1
    VIDIOCGCHAN(2)
    channel                 : 2
    name                    : "Internal/comp"
    tuners                  : 0
    flags                   : 0x0 []
    type                    : CAMERA
    norm                    : 1

tuner
ioctl VIDIOCGTUNER: Invalid argument

audio
ioctl VIDIOCGAUDIO: Invalid argument

picture
    VIDIOCGPICT
    brightness              : 32896
    hue                     : 32896
    colour                  : 33026
    contrast                : 33026
    whiteness               : 0
    depth                   : 16
    palette                 : YUYV

buffer
    VIDIOCGFBUF
    base                    : (nil)
    height                  : 768
    width                   : 1024
    depth                   : 32
    bytesperline            : 4096

window
    VIDIOCGWIN
    x                       : 0
    y                       : 0
    width                   : 0
    height                  : 0
    chromakey               : 0
    flags                   : 0

두가지를 다 리다이렉션은 하지만, 버퍼로 인해서 밀리는건가.. 아니면 다른 명령어가 있는걸까?

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