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Top Forums Shell Programming and Scripting AIX UNIX (kshell) to Linux Shell Script Migration. Post 302906306 by bakunin on Wednesday 18th of June 2014 03:31:57 PM
Old 06-18-2014
Quote:
Originally Posted by Perderabo
I got hit with my ksh scripts just going from RedHat 5 to RedHat 6. Yes, they changed the behavior of the builtin echo command.
I always preferred the equally builtin "print" over "echo". It has a lot of advantages (the "-u" switch which "echo" lacks, the "-p", ...) and no disadvantages that i know of. Original versions of the Korn shell didn't have the "echo" built in but use the external "/usr/bin/echo", which is why i started the habit of using "print" instead.

Quote:
Bakunin, it has just been tested: variables without a preceding $ work in AIX. It works with simple [ ] .

We were really surprised about this because we never saw it before. But I am talking about hundreds of scripts written like this for a bank.
Could you please post such a script part? I administrate AIX systems for the last 25 years now (started with 3.2.3 on a RS/6000 model 32H) and i never came across such a behavior. To be honest i can't believe that.

Quote:
Although it is only a visual matter, to me it looks like something unproperlly finished.. Anyone that sees those scripts without opening them will think that is ksh .
You are right and i would change that too, no matter what. It still is not a requirement, though, and i wanted to exmphasize that difference.

bakunin

Last edited by bakunin; 06-18-2014 at 04:46 PM..
 

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ECHO(1) 						    BSD General Commands Manual 						   ECHO(1)

NAME
echo -- write arguments to the standard output SYNOPSIS
echo [-n] [string ...] DESCRIPTION
The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline (' ') character, to the standard output. The following option is available: -n Do not print the trailing newline character. The end-of-options marker -- is not recognized and written literally. The newline may also be suppressed by appending 'c' to the end of the string, as is done by iBCS2 compatible systems. Note that the -n option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. For porta- bility, echo should only be used if the first argument does not start with a hyphen ('-') and does not contain any backslashes (''). If this is not sufficient, printf(1) should be used. Most shells provide a builtin echo command which tends to differ from this utility in the treatment of options and backslashes. Consult the builtin(1) manual page. EXIT STATUS
The echo utility exits 0 on success, and >0 if an error occurs. SEE ALSO
builtin(1), csh(1), printf(1), sh(1) STANDARDS
The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. BSD
November 12, 2010 BSD
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