bash stdout输出出现在重定向的stderr文件中

Bash医生这么说 echo 写信给 stdout .我有一个脚本可以重定向 stderr 归档 2>/home/pi/mydir/stderr-log.txt .它不会重定向 斯特杜特 .但文本输出由 回响 正在进入日志文件。

脚本在后台运行(通过添加 & 直到命令的末尾)?

完整的脚本:

#! /bin/sh

case "$1" in 
start)
echo "Starting mjpg_streamer!"
#First init
/usr/local/bin/mjpg_streamer -i "/usr/local/lib/mjpg-streamer/input_uvc.so -n -f 30 -r 640x480 -d /dev/video0" -o "/usr/local/lib/mjpg-streamer/output_http.so -p 8085 -w /usr/local/share/mjpg-streamer/www" 2>/home/pi/mydir/stderr-log.txt &
#Second init
/usr/local/bin/mjpg_streamer -i "/usr/local/lib/mjpg-streamer/input_uvc.so -n -f 30 -r 640x480 -d /dev/video1" -o "/usr/local/lib/mjpg-streamer/output_http.so -p 8086 -w /usr/local/share/mjpg-streamer/www" 2>/home/pi/mydir/stderr-log.txt &
;;
stop)
echo "Stopping mjpg_streamer!"
killall mjpg_streamer
;;
*)
echo "usage: videoinit {start|stop}"
exit 1
;;
esac
exit 0

调用此脚本的脚本(当它在日志文件中发现新的错误消息时):

#!/bin/bash

    ERRORLOG="/home/pi/mydir/stderr-log.txt"
    LINECOUNT=0
    NEWLINECOUNT=0
    rm ${ERRORLOG}
    touch ${ERRORLOG}
    while true; do
       inotifywait -q -e modify ${ERRORLOG} > /dev/null
       NEWLINECOUNT=$(grep --count "Error grabbing frames" ${ERRORLOG} )
       if [[ NEWLINECOUNT > LINECOUNT ]]; then
          LINECOUNT=NEWLINECOUNT
          /etc/init.d/videoinit stop
          echo "Attempting mjpg-streamer reboot."
          /etc/init.d/videoinit start
       fi
    done