Question

我将在底部包含整个脚本以供参考。在init脚本结束时调用此脚本。如果我在登录后运行脚本，则运行时没有错误。 30000英尺视图，尝试执行rsync命令并将任何错误捕获到变量中。我正在使用bash 3.5.6pl。

以下是罪魁祸首：

LogMessage+=$(rsync -rpltDzv --delete --progress /mnt/WinPrimary /mnt/WinBackup 2>&1 >/dev/tty)$'\n'

变量中存储的内容是：

/etc/Braums/scripts/Sync1to2.sh: line 47: /dev/tty: No such device or address

我用Google搜索技术来捕获stderr而不是stdout。我希望显示进度而不是捕获所有屏幕内容。所以init调用脚本“Sync1to2.sh”。哪个有上面的命令。如果我在登录后从命令行运行相同的脚本，它将按预期运行。

这是整个Sync1to2.sh脚本。我不经常做bash脚本，所以要小心，不要伤害自己的笑声。另外一个注意事项，下面是我尝试/ dev / stdout时它有一些诊断。我认为当getty运行时它有什么用？

#!/bin/bash
#
#Variable to set if an error occurs at any point during the process.
ErrorOccured="False"
LogMessage=""

LogMessage+=$0$' was stated at '$(date)$'\n'

if !(mount | grep -cq "/mnt/WinPrimary")
then
    LogMessage+=$'=============================================\n'
    LogMessage+=$'][ No Windows Primary found.               ][\n'
    LogMessage+=$'][  Check drives and try again.            ][\n'
    LogMessage+=$'=============================================\n'
    ErrorOccured="True"
fi
if !(mount | grep -cq "/mnt/WinBackup")
then
    LogMessage+=$'=============================================\n'
    LogMessage+=$'][ No Windows Backup found.                ][\n'
    LogMessage+=$'][  Check drives and try again.            ][\n'
    LogMessage+=$'=============================================\n'
    ErrorOccured="True"
fi
if test "$ErrorOccured" == "False"
then
  #Maybe add cleanup the harddrive later
  if [ -f /mnt/WinPrimary/Sync1to2.err ]
  then
    LogMessage+=$'=============================================\n'
    LogMessage+=$'][ Found a Sync1to2.err.                   ][\n'
    LogMessage+=$'][  Are we being run in a loop?            ][\n'
    LogMessage+=$'=============================================\n'
    ErrorOccured="True"
  fi
  if [ -f /mnt/WinPrimary/Sync1to2.ok ]
  then
    LogMessage+=$'=============================================\n'
    LogMessage+=$'][ Found a Sync1to2.ok.                    ][\n'
    LogMessage+=$'][  Are we being run in a loop?            ][\n'
    LogMessage+=$'=============================================\n'
    ErrorOccured="True"
  fi
  if [ "$ErrorOccured" == "False" ]
  then
    LogMessage+=$'Sync Started '$(date)$'\n'
    LogMessage+=$(rsync -rpltDzv --delete --progress /mnt/WinPrimary /mnt/WinBackup 2>&1 >/dev/stdout)$'\n'
    ExitValue=$?
    LogMessage+=$'Sync Finished '$(date)$'\n'
    LogMessage+=$'____________________ '$(date)$'\n'
    LogMessage+=$(ls /dev/tty*)$'\n'
    LogMessage+=$'____________________ '$(date)$'\n'
    LogMessage+=$'____________________ '$(date)$'\n'
    LogMessage+=$(ls /dev/stdout)$'\n'
    LogMessage+=$'____________________ '$(date)$'\n'

    if [ $ExitValue != 0 ]
    then 
      ErrorOccured="True"
    fi
  fi
fi
echo $ErrorOccured
if [ "$ErrorOccured" == "True" ]
then
  echo "Sync1to2 errored out" >> /mnt/WinPrimary/Sync1to2.err
  echo "_______________________________________________________" >> /mnt/WinPrimary/Sync1to2.err
  echo "Finished $(date)" >> /mnt/WinPrimary/Sync1to2.err
  echo "$LogMessage" >> /mnt/WinPrimary/Sync1to2.err
  echo "_______________________________________________________" >> /mnt/WinPrimary/Sync1to2.err
else
  echo "Sync1to2 ok" >> /mnt/WinPrimary/Sync1to2.ok
  echo "_______________________________________________________" >> /mnt/WinPrimary/Sync1to2.ok
  echo "Finished $(date)" >> /mnt/WinPrimary/Sync1to2.ok
  echo "$LogMessage" >> /mnt/WinPrimary/Sync1to2.ok
  echo "_______________________________________________________" >> /mnt/WinPrimary/Sync1to2.ok
  cp /mnt/WinPrimary/menu.default.lst /mnt/WinPrimary/menu.lst
  cp /mnt/WinPrimary/menu.default.lst /mnt/WinBackup/menu.lst
  echo Shuting down
fi
/etc/Braums/scripts/LogPing.pl Sync1to2 "$LogMessage"
exit 254

Answer 1

而不是写入/dev/tty，如何简单地交换stdout和stderr？

yourcommand 3>&2 2>&1 1>&3 3>&-

这是使用第三个临时变量交换两个变量内容的重定向：

3>&2  # tmp = stderr 
2>&1  # stderr = stdout
1>&3  # stdout = tmp
3>&-  # close(tmp)

init脚本'/ dev / tty：重定向时没有这样的设备或地址'错误

1 个答案: