初始化脚本'为/ dev / tty的：没有这样的设备或地址“上重定向错误 [英] init script '/dev/tty: No such device or address' error on redirect
问题描述
我将包括在底部参考整个脚本。该脚本会被调用向启动脚本的结束。如果我登录后运行该脚本，它没有错误运行。 30000英尺的观点，试图执行rsync命令，并捕获任何错误到一个变量。我使用bash 3.5.6pl。
下面是罪魁祸首行：
的LogMessage + = $（rsync的-rpltDzv --delete --progress的/ mnt / WinPrimary到/ mnt / WinBackup 2 - ;＆放1 GT;的/ dev / tty的）$的'\\ n'
什么被存储在变量，这并得到写入日志，是：
/etc/Braums/scripts/Sync1to2.sh：第47行是：/ dev / tty的：没有这样的设备或地址
我GOOGLE的语法来捕获标准错误而不是标准输出的技术。我希望进度显示，而不是捕获所有屏幕的东西。
所以在init调用脚本Sync1to2.sh。具有上述命令。如果我登录之后运行命令行相同的脚本，它运行正常。
下面是整个Sync1to2.sh脚本。我不这样做的bash脚本过于频繁，所以一定要小心，不要伤害自己笑了起来。另外一个说明，下面是当我试图为/ dev /标准输出，它有一定的诊断。我打赌它有东西时，getty正在跑？
＃！/斌/庆典
＃
＃变量到如果在过程中的任何点发生错误设定。
ErrorOccured =假
的LogMessage =的LogMessage + = $ 0 $ $（日期）$在指出'的'\\ n'！如果（安装| grep的-cq到/ mnt / WinPrimary）
然后
的LogMessage + = $'============================================= \\ N'
的LogMessage + = $'] [未Windows主发现。 ] [\\ N'
的LogMessage + = $'] [查看驱动器，然后再试一次。 ] [\\ N'
的LogMessage + = $'============================================= \\ N'
ErrorOccured =真
科幻
！如果（安装| grep的-cq到/ mnt / WinBackup）
然后
的LogMessage + = $'============================================= \\ N'
的LogMessage + = $'] [未Windows备份中。 ] [\\ N'
的LogMessage + = $'] [查看驱动器，然后再试一次。 ] [\\ N'
的LogMessage + = $'============================================= \\ N'
ErrorOccured =真
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如果测试$ ErrorOccured==假
然后
#Maybe的硬盘以后添加清理
如果[-f /mnt/WinPrimary/Sync1to2.err]
然后
的LogMessage + = $'============================================= \\ N'
的LogMessage + = $'] [我要Sync1to2.err。 ] [\\ N'
的LogMessage + = $'] [我们是否正在运行一个循环？ ] [\\ N'
的LogMessage + = $'============================================= \\ N'
ErrorOccured =真
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如果[-f /mnt/WinPrimary/Sync1to2.ok]
然后
的LogMessage + = $'============================================= \\ N'
的LogMessage + = $'] [我要Sync1to2.ok。 ] [\\ N'
的LogMessage + = $'] [我们是否正在运行一个循环？ ] [\\ N'
的LogMessage + = $'============================================= \\ N'
ErrorOccured =真
科幻
如果[$ ErrorOccured==假]
然后
的LogMessage + = $'同步启动'$（日期）$的'\\ n'
的LogMessage + = $（rsync的-rpltDzv --delete --progress的/ mnt / WinPrimary到/ mnt / WinBackup 2 - ;＆放1 GT;的/ dev /标准输出）$的'\\ n'
ExitValue = $？
的LogMessage + = $'同步完成$（日期）$的'\\ n'
的LogMessage + = $'____________________'$（日期）$的'\\ n'
的LogMessage + = $（LS为/ dev / tty的*）$的'\\ n'
的LogMessage + = $'____________________'$（日期）$的'\\ n'
的LogMessage + = $'____________________'$（日期）$的'\\ n'
的LogMessage + = $（LS为/ dev /标准输出）$的'\\ n'
的LogMessage + = $'____________________'$（日期）$的'\\ n' 如果[$ ExitValue！= 0]
然后
ErrorOccured =真
科幻
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回声$ ErrorOccured
如果[$ ErrorOccured==真]
然后
回声Sync1to2出错了＆GT;＆GT; /mnt/WinPrimary/Sync1to2.err
回声_______________________________________________________＆GT;＆GT; /mnt/WinPrimary/Sync1to2.err
回声说完$（日期）＆GT;＆GT; /mnt/WinPrimary/Sync1to2.err
回声$的LogMessage＆GT;＆GT; /mnt/WinPrimary/Sync1to2.err
回声_______________________________________________________＆GT;＆GT; /mnt/WinPrimary/Sync1to2.err
其他
回声Sync1to2 OK＆GT;＆GT; /mnt/WinPrimary/Sync1to2.ok
回声_______________________________________________________＆GT;＆GT; /mnt/WinPrimary/Sync1to2.ok
回声说完$（日期）＆GT;＆GT; /mnt/WinPrimary/Sync1to2.ok
回声$的LogMessage＆GT;＆GT; /mnt/WinPrimary/Sync1to2.ok
回声_______________________________________________________＆GT;＆GT; /mnt/WinPrimary/Sync1to2.ok
CP /mnt/WinPrimary/menu.default.lst /mnt/WinPrimary/menu.lst
CP /mnt/WinPrimary/menu.default.lst /mnt/WinBackup/menu.lst
张树庭呼应向下
科幻
/etc/Braums/scripts/LogPing.pl Sync1to2$的LogMessage
出口254
而不是写的/ dev / tty的，如何简单地交换输出和错误？
yourcommand 3 GT;和2 2 - ;＆放大器; 1 1 GT;及3 3 GT;＆安培; -
这是重定向相当于使用第三临时变量交换两个变量的内容：
3 GT;和2＃TMP =标准错误
2 - ;＆放大器; 1＃标准错误=标准输出
1＆GT;及3＃标准输出= TMP
3＆GT;＆安培; - ＃接近（TMP）
I will include the entire script at the bottom for reference. This script gets called toward the end of the init scripts. If I run the script after logging in, it runs with no error. 30000 foot view, trying to execute a rsync command and capture any errors into a variable. I am using bash 3.5.6pl.
Here is the line that is the culprit:
LogMessage+=$(rsync -rpltDzv --delete --progress /mnt/WinPrimary /mnt/WinBackup 2>&1 >/dev/tty)$'\n'
What is stored in the variable, which does get written to a log, is:
/etc/Braums/scripts/Sync1to2.sh: line 47: /dev/tty: No such device or address
I googled the technique for the syntax to capture stderr but not stdout. I want the progress to show and not capture all the screen stuff. So the init calls the script "Sync1to2.sh". Which has the above command. If I run the same script from the command line after logging in, it runs as expected.
Here is the entire Sync1to2.sh script. I don’t do bash scripts too often, so be careful and don’t hurt yourself laughing. One other note, below is when I tried /dev/stdout and it has some diagnostic. I betting it has something to when getty is ran?
#!/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
Rather than writing to /dev/tty, how about simply swapping stdout and stderr?
yourcommand 3>&2 2>&1 1>&3 3>&-
This is the redirection equivalent of swapping the contents of two variables using a third temporary variable:
3>&2 # tmp = stderr
2>&1 # stderr = stdout
1>&3 # stdout = tmp
3>&- # close(tmp)
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