This website requires Javascript to function properly. Please go to the setting of your web browser and enable Javascript for this website.

×

Loading...

Ad by

技多不压身，工到自然成：安省技工证书特训班，点击咨询报名！

Ad by

技多不压身，工到自然成：安省技工证书特训班，点击咨询报名！

请教unix shell 高手，看看下面的程序，为什么 mv 文件的部分被执行了两次。

blackswan(uglyduck)

本文发表在 rolia.net 枫下论坛#!/bin/ksh

# NAME: cleanup()
#
# DESCRIPTION: unsets traps, issues error messages and exits with a return code
#
# INPUT:
# $1 = exit code
# $2 = message if not null
#
cleanup ()
{
ec=$1
msg=$2

if [ $ec != 0 ]
then
printf "Batch Job Failure.....\n" >>$LOG_FILE
else
printf "Job completed; return code $ec DATE:`now`\n" >>$LOG_FILE
fi
trap -
exit "$ec"
}

################### main ##################

{
#####
/usr/sbin/mknod /tmp/exp_pipe p
compress </tmp/exp_pipe>/u06/export/fullexp_wacarc.dmp.Z &

ORA_EXP_FILE="/tmp/exp_pipe"
########
export LOG_DIR ORA_EXP_FILE

LOG_FILE=$LOG_DIR/fullexp_wacarc.log
JOB_SERVER=`hostname`
JOB_NAME=`basename $0 .sh`

DATETIME=`date '+%Y%m%d'`

mv /u06/export/day_2/fullexp_wacarc.dmp.Z /u06/export/day_3
mv /u06/export/day_1/fullexp_wacarc.dmp.Z /u06/export/day_2
mv /u06/export/fullexp_wacarc.dmp.Z /u06/export/day_1

#
# Trap on exit/interrupt/break to clean up
#

trap "cleanup 99 \">>> Abnormal program termination..."\" 1 2 15

#
# Initialize the logfile...
#
printf "Server: $JOB_SERVER\n" >$LOG_FILE
printf "Job: $JOB_NAME started DATE:`now`\n" >>$LOG_FILE

$ORACLE_HOME/bin/exp userid=system/${sidpwd} file=$ORA_EXP_FILE \
log=$LOG_DIR/full_backup.log full=y

RC=$?
[ $RC != 0 ] &&cleanup $RC "Export wacarc"
cleanup 0
}更多精彩文章及讨论，请光临枫下论坛 rolia.net

(#2245120@0)
Last Updated: 2005-4-17
This post has been archived. It cannot be replied.

Report

Replies, comments and Discussions:

工作学习 / IT技术讨论 / 请教unix shell 高手，看看下面的程序，为什么 mv 文件的部分被执行了两次。 -blackswan(uglyduck); 2005-4-17 {1481} (#2245120@0)
本文发表在 rolia.net 枫下论坛#!/bin/ksh

# NAME: cleanup()
#
# DESCRIPTION: unsets traps, issues error messages and exits with a return code
#
# INPUT:
# $1 = exit code
# $2 = message if not null
#
cleanup ()
{
ec=$1
msg=$2

if [ $ec != 0 ]
then
printf "Batch Job Failure.....\n" >>$LOG_FILE
else
printf "Job completed; return code $ec DATE:`now`\n" >>$LOG_FILE
fi
trap -
exit "$ec"
}

################### main ##################

{
#####
/usr/sbin/mknod /tmp/exp_pipe p
compress </tmp/exp_pipe>/u06/export/fullexp_wacarc.dmp.Z &

ORA_EXP_FILE="/tmp/exp_pipe"
########
export LOG_DIR ORA_EXP_FILE

LOG_FILE=$LOG_DIR/fullexp_wacarc.log
JOB_SERVER=`hostname`
JOB_NAME=`basename $0 .sh`

DATETIME=`date '+%Y%m%d'`

mv /u06/export/day_2/fullexp_wacarc.dmp.Z /u06/export/day_3
mv /u06/export/day_1/fullexp_wacarc.dmp.Z /u06/export/day_2
mv /u06/export/fullexp_wacarc.dmp.Z /u06/export/day_1

#
# Trap on exit/interrupt/break to clean up
#

trap "cleanup 99 \">>> Abnormal program termination..."\" 1 2 15

#
# Initialize the logfile...
#
printf "Server: $JOB_SERVER\n" >$LOG_FILE
printf "Job: $JOB_NAME started DATE:`now`\n" >>$LOG_FILE

$ORACLE_HOME/bin/exp userid=system/${sidpwd} file=$ORA_EXP_FILE \
log=$LOG_DIR/full_backup.log full=y

RC=$?
[ $RC != 0 ] &&cleanup $RC "Export wacarc"
cleanup 0
}更多精彩文章及讨论，请光临枫下论坛 rolia.net

你是说执行了三次吗？是顺序移动啊。最旧的永远是第三个。 -linmeimei(冰雪林妹妹); 2005-4-17 (#2245217@0)

不是，执行的结果是： -blackswan(uglyduck); 2005-4-17 {143} (#2245427@0)
/u06/export/ 是空
/u06/export/day_1 是当天备份的文件
/u06/export/day_2 是空
/u06/export/day_3 是前一天备份的文件
好像是mv 的部分执行了两次

你的意思是不是 -vetra(piyupiyu); 2005-4-17 {228} (#2246261@0)
mv /u06/export/day_2/fullexp_wacarc.dmp.Z /u06/export/day_3 这句话还没有执行完，已经把下面一句也执行了
mv /u06/export/day_1/fullexp_wacarc.dmp.Z /u06/export/day_2
然后看到的day_3是昨天的东西，应该是前天的东西，这样理解对吗？

我也不知道是怎么回事，只是猜测. day_2应该是前天的备肥，day_1应该是昨天的备肥，/u06/export/是当天的备份，可是现在中间总有一个空目录，好像备份没完成时，程序由被运行了一次，另外output file如下，请进： -blackswan(uglyduck); 2005-4-18 {228} (#2246773@0)
Server: xxxxxxx
Job: export_compressed started DATE:050415 (Fri) 04:00:00
Job completed; return code 0 DATE:050415 (Fri) 04:00:10
Job completed; return code 0 DATE:050415 (Fri) 04:00:13

不明白为什么会有2行“Job completed“

看着两句话，这个Shell不是你写的啊，我不小心看到了很多我想要的东西，我就是看的懂，懒得写。 -vetra(piyupiyu); 2005-4-18 {193} (#2247042@0)
[ $RC != 0 ] &&cleanup $RC "Export wacarc"
cleanup 0
第一句话，就是if then else 的语句，你的RC执行出来的结果不是0,所以执行了一次cleanup,
第二句话，就是再执行一次。
所以你看到了两次结果。

程序不是我写的。我只是不明白，如果第一次RC执行出来的结果不是0, 为什么输出文件中的两次return code 0 , 而不是“Batch Job Failure“ -blackswan(uglyduck); 2005-4-18 (#2247448@0)

You need to study "korn shell" programming. It never give you "Batch job failure". The return "0" you see is the status of last executed cmd in that shell script. -bugfree(BugFree); 2005-4-30 (#2269717@0)

另外$RC的值是exp's return code 还是compress's return code? Thanks! -blackswan(uglyduck); 2005-4-18 (#2247486@0)

I did test on my UNIX box, it only returns me one time, either "Job completed" or "Batch Job Failure....." -vetra(piyupiyu); 2005-4-18 (#2247544@0)

I did the test on our dev box, the result is same as yours. Even on prod server, it only occur at some night. not always. :-) -blackswan(uglyduck); 2005-4-18 (#2247733@0)

then you need analyze the difference and narrow down the problem. have fun! -vetra(piyupiyu); 2005-4-18 (#2247838@0)

Let me answer this question. In shell script, the return code is always the last command it executed. The special case is using "exit <val>" to terminate the program, then the return code will be "<val>" -bugfree(BugFree); 2005-4-30 (#2269714@0)

This is the aswer: You need to verbose debug your script. to see why "mv /u06/export/day_1/fullexp_wacarc.dmp.Z /u06/export/day_2" failed. This is the procedure: -bugfree(BugFree); 2005-4-30 {193} (#2269727@0)
1) ksh -x <script name>, it will verbose all command line and its output.
2) the second way to do it is to change the first line of script from
#!/bin/ksh
to
#!/bin/ksh -x

Good luck !

More Topics

老程序员第一次用copilot的一点点体会

现在社区游泳池招救生员巡逻，过一会还要不停的点人头，这工作是否很快就被AI代替了，装一个摄像头后面是AI处理系统，这样只招一个等着救人就行了，人头沉下水一定时间立马强光照射，还可以分析水下人的状况来判断是否溺水等

新冠疫苗引发心肌炎? 最新研究这样看

这道几何题有解吗?

枫下论坛主坛 / 工作学习 / IT技术讨论