使用 nohup 执行命令很困惑? [英] Using nohup to execute command very confused?

问题描述

我的脚本:

#!/bin/bash
. /home/was/.bash_profile
export PATH=/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home/was/bin:/wasdata/oracle/10.2.0/client_1/bin:

  sqlplus "mon_system/monsystem@10.10.4.90" <<eof 
  set echo off
  set feedback off
  set serveroutput on 
  set term off
  set sqlprompt ""
  set linesize 200
  spool /wasdata/scripts/systeminf/tmp-was-restart.sh
  exec prc_auto_restart
eof
  sed -i '/prc_auto_restart/d' tmp-was-restart.sh
  /wasdata/scripts/systeminf/tmp-was-restart.sh
  cat /dev/null>/wasdata/scripts/systeminf/tmp-was-restart.sh

过程是:

1. 登录数据库执行程序prc_auto_restart"
2. 该过程将输出/wasdata/scripts/systeminf/tmp-was-restart.sh
3. 执行/wasdata/scripts/systeminf/tmp-was-restart.sh

tmp-was-restart.sh 会喜欢:

the tmp-was-restart.sh will like:

ssh was1@10.10.4.212 "ps -ef|grep was1.*WebSphere.*c01_ship_s01|grep -v "grep">>kill.log;ps -ef|grep was1.*WebSphere.*c01_ship
_s01|grep -v "grep"|awk '{print \"kill -9 \" \$2}'|sh" 

当我直接执行脚本时，脚本有效:

When i execute the script directly, the script works :

[was@web-tkt2-01 systeminf]$ ./prod-auto-restart.sh 

SQL*Plus: Release 10.2.0.1.0 - Production on Sat Aug 6 16:33:08 2011

Copyright (c) 1982, 2005, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options

SQL> SQL> SQL> SQL> SQL> ssh -t -t was1@10.10.4.212 "ps -ef|grep was1.*WebSphere.*c01_ship_s01|grep -v "grep">>kill.log;ps -ef|grep was1.*WebSphere.*c01_ship_s01|grep -v "grep"|awk '{print \"kill -9 \" \$2}'|sh"
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
Connection to 10.10.4.212 closed.
[was@web-tkt2-01 systeminf]$ 

但是当我使用 nohup 执行脚本时:

But when i use nohup to execute the script:

[was@web-tkt2-01 systeminf]$ nohup prod-auto-restart.sh &
[1] 29983
[was@web-tkt2-01 systeminf]$ nohup: appending output to `nohup.out'


[1]+  Stopped                 nohup prod-auto-restart.sh
[was@web-tkt2-01 systeminf]$ 
[was@web-tkt2-01 systeminf]$ 
[was@web-tkt2-01 systeminf]$ ps -ef|grep autp
was      30014 27492  0 16:33 pts/4    00:00:00 grep autp
[was@web-tkt2-01 systeminf]$ ps -ef|grep auto
was      29983 27492  0 16:33 pts/4    00:00:00 /bin/bash prod-auto-restart.sh
was      30003 29983  0 16:33 pts/4    00:00:00 /bin/bash prod-auto-restart.sh
was      30021 27492  0 16:33 pts/4    00:00:00 grep auto

它会 fork 两个 shell，我检查了 tmp-was-restart.sh，它是正确的，这意味着命令 sed -i '/prc_auto_restart/d' tmp-was-restart.sh 执行正确，它停在 /wasdata/scripts/systeminf/tmp-was-restart.sh，我也尝试 source/execute 方法，两者都不起作用，在我杀死进程 29983 后，命令 /wasdata/scripts/systeminf/tmp-was-restart.sh 执行，但是cat/dev/null>/wasdata/scripts/systeminf/tmp-was-restart.sh 没有执行，很迷茫！！！

It will fork two shell, and i check the tmp-was-restart.sh, it was correct, and that mean the command sed -i '/prc_auto_restart/d' tmp-was-restart.sh execute correct,and it stoped at /wasdata/scripts/systeminf/tmp-was-restart.sh, I alse try source/execute method, both not work, after i kill the process 29983 ,the command /wasdata/scripts/systeminf/tmp-was-restart.sh executed, but the cat /dev/null>/wasdata/scripts/systeminf/tmp-was-restart.sh not executed, very confused!!!

推荐答案

Stopped 消息的最常见原因是脚本期望用户通过命令行输入，通常是 <代码>读取命令.我在您发布的代码中没有看到任何内容，因此如果有任何不可见的子脚本，请检查read.脚本收到Ctrl-S"(停止)字符或 ?信号.

The most common reason for the Stopped message is that the script is expecting input from the user via the command line, usually a read command. I don't see any in the code you posted, so if there are any child scripts not visible, check there for read. Much less likely is that the script has received a 'Ctrl-S' (stop) character or ? Signal.

您对 sqlplus 的使用看起来是正确的，但我无法访问 sqlplus 来测试任何理论，因此请仔细检查 sqlplus 的 cmd-line 用法文档，也许有一个 -n选项(或其他)表示无 cmd-line 交互".

Your usage of sqlplus looks correct, but I don't have access to sqlplus to test any theories, so double check the documentation for cmd-line usage of sqlplus, maybe there a an -n option (OR other) to indicate 'no cmd-line interaction' .

最后，也许 shell 调试模式可以帮到你.

Finally, maybe shell debugging mode can help you.

试试PS4='$LINENO>';在脚本顶部附近设置 -vx.弄清楚如何读取输出需要一些学习.-v 选项显示正在评估的代码块，或者是 if .. ；然后 ;... 别的 ;... fi，或 while ... done 或只是一个管道.

Try PS4='$LINENO>'; set -vx near top of script. It takes a little learning to figure out how to read the output. The -v options displays block of code being evaluated, either an if .. ; then ; ... else ; ... fi,, or while ... done or just a single pipeline.

我希望这会有所帮助.

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P.S. as you appear to be a new user, if you get an answer that helps you please remember to mark it as accepted, and/or give it a + (or -) as a useful answer.

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