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Rman Linux Script Trap Error Status

and Signals and Traps (Oh My!) - Part 1 by William Shotts, Jr. In this lesson, we're going to look at handling errors during the execution of your scripts. The difference between a good program shell script exit code and a poor one is often measured in terms of the program's robustness.

Shell Script Error Handling

That is, the program's ability to handle situations in which something goes wrong. Exit status As you recall from previous bash if exit code lessons, every well-written program returns an exit status when it finishes. If a program finishes successfully, the exit status will be zero. If the exit status is anything other than zero, then the program bash script exit on error failed in some way. It is very important to check the exit status of programs you call in your scripts. It is also important that your scripts return a meaningful exit status when they finish. I once had a Unix system administrator who wrote a script for a production system containing the following 2 lines of code: # Example of a really bad idea cd $some_directory rm

Linux Kernel Error Codes

* Why is this such a bad way of doing it? It's not, if nothing goes wrong. The two lines change the working directory to the name contained in $some_directory and delete the files in that directory. That's the intended behavior. But what happens if the directory named in $some_directory doesn't exist? In that case, the cd command will fail and the script executes the rm command on the current working directory. Not the intended behavior! By the way, my hapless system administrator's script suffered this very failure and it destroyed a large portion of an important production system. Don't let this happen to you! The problem with the script was that it did not check the exit status of the cd command before proceeding with the rm command. Checking the exit status There are several ways you can get and respond to the exit status of a program. First, you can examine the contents of the $? environment variable. $? will contain the exit status of the last command executed. You can see this work with the following: [me] $ true; echo $? 0 [me] $ false; echo $? 1 The true and false commands are programs t

September 2009 Oracle Magazine Online 2016 2015 2014 2013 2012 2011 2010 As Published In September/October 2009 TECHNOLOGY: Recovery Scripting Oracle RMAN Commands By Arup Nanda Learn how to create and automate scripts to execute common recovery tasks. Many DBAs have discovered how Oracle Recovery bash if exit code not 0 Manager (Oracle RMAN) can reliably back up, restore, and recover Oracle Database instances. Among its many exit bash shell features is the ability to script the commands for batch-centric, hands-off execution. This article discusses the ways to script Oracle RMAN commands in Oracle

Shell Script Return Value

Database 11g and how to pick the right approach for your specific needs. Why Script? Why create a script for Oracle RMAN commands? There are two primary reasons: 1. Most Oracle RMAN activities are batch-oriented and can be automated. http://linuxcommand.org/wss0150.php For instance, backing up a database is a repetitive activity and not something you would want to execute interactively. 2. Scripts provide consistency. For tasks of an ad hoc nature, such as recovering a database from a backup, automation is not strictly required. When a script is used to execute the activity, however, the action will be the same, regardless of the experience and expertise of the DBA performing the recovery. There are two ways to script Oracle http://www.oracle.com/technetwork/issue-archive/2009/09-sep/o59recovery-085185.html RMAN commands in Oracle Database 11g: 1. Use a command file. A command file is a text file residing in the file system. 2. Use a stored script. This script is stored in the Oracle RMAN catalog database and executed from the Oracle RMAN command prompt. Command Files Oracle RMAN command files are plain-text files and similar to shell scripts in UNIX or batch files in Microsoft Windows. Listing 1 shows a very simple example command file—named backup_ts_users.rman—used to back up the USERS tablespace. The file extension .rman is not necessary, but it is helpful in making the meaning of the file clear. Code Listing 1: Command file for backing up USERS tablespace connect target / connect catalog rman/secretpass@rmancat run { allocate channel c1 type disk format '/orabak/%U'; backup tablespace users; } You can call a command file in several ways. From the Oracle RMAN prompt, you can call the example command file as follows: RMAN> @backup_ts_users.rman Note that the command file is executed by the @ sign. It is important, however, to provide the full name of the command file, including the extension. (The Oracle RMAN executable does not expect or apply a default extension.) You can also call the command file directly from the command line as rman @backup_ts_users.rman This approach for calling the script is highly useful in shell scripts or batch files for making backups. Also n

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about http://unix.stackexchange.com/questions/79648/how-to-trigger-error-using-trap-command Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers shell script are voted up and rise to the top How to trigger error using Trap command up vote 8 down vote favorite 3 I am using Ubuntu 12.04.2. I am trying to use "trap" command to capture abnormal or error in my shell script but I am also trying to manually trigger "Error" exit. I have tried exit 1, but it won't trigger "Error" signal. #!/bin/bash func() { exit 1 } trap "echo bash if exit hi" INT TERM ERR func Not sure how to manually trigger "Error" exit signal? bash shell error-handling trap share|improve this question edited Apr 27 at 16:05 Anthon 47.7k1462126 asked Jun 17 '13 at 4:21 forestclown 16115 add a comment| 2 Answers 2 active oldest votes up vote 12 down vote accepted the ERR trap is not to run code when the shell itself exits with a non-zero error code, but when any command run by that shell that is not part of a condition (like in if cmd..., or cmd || ......) exits with a non-zero exit status (the same conditions as what causes set -e to exit the shell). If you want to run code upon exit of the shell with non-zero exit status, you should add a trap on EXIT instead and check $? there: trap '[ "$?" -eq 0 ] || echo hi' EXIT Note however that upon a trapped signal, both the signal trap and the EXIT trap would be run, so you may want to do it like: unset killed_by trap 'killed_by=INT;exit' INT trap 'killed_by=TERM;exit' TERM trap ' ret=$? if [ -n "$killed_by" ]; then echo >&2 "Ouch! Killed by $killed_by" exit 1 elif [ "$ret" -ne 0 ]; then echo >&2 "Died with error code $ret" fi'

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