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Top Forums Shell Programming and Scripting AIX UNIX (kshell) to Linux Shell Script Migration. Post 302906170 by Chubler_XL on Tuesday 17th of June 2014 05:30:04 PM
Old 06-17-2014
It's been a long time since I did a big project to convert AIX scripts to RHEL. I do remember having some trouble with echo statements not expanding the backslash characters (like \n) for example:

Code:
echo "\nStop Service now: [y]  \c"

I believe this was related to /bin/sh just being a symbolic link to bash but running in "strict compatibility" mode. However, we found that turning on shopt -s xpg_echo at the top of the script was usually enough to get the echo statements working as they used to and much less time consuming than converting everything to use printf.

Also watch out for anything that directly interacts with the /dev device files. as almost certainly they will be named differently that the AIX devices. Think here about accessing DVD/CD device or backup tape drives or changers.

Our backup scripts needed to be re-written as they used commands like sysback and tape to interact with tape libraries/changers and things were just too different under AIX, we decided rather than redevelop this it was easier to implement a commercial backup solution (I think it was CommVault), this came with an agent that managed most of the I/O and we only need to develop little stub scripts that were called to do things like stop the database or do an on-line backup to a file.
 

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exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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