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Full Discussion: ksh Logging
Top Forums UNIX for Beginners Questions & Answers ksh Logging Post 303032626 by Don Cragun on Thursday 21st of March 2019 05:36:34 AM
Old 03-21-2019
Quote:
Originally Posted by bakunin
In addition to what RudiC already said: if you want to redirect larger parts of a script i would - simply for better readability - not shift around output streams in a way so that one depends on the other. I would set them separately and independently like this:

Code:
exec 2>/some/file
exec 1>/some/file

If you later decide to redirect one or the other to somewhere else it won't affect the other redirecction at all.

I hope this helps.

bakunin
Hi bakunin,
Sorry, but I must strongly disagree with your suggestion.

Opening these two files this way creates two file descriptors pointing at the same file with both writing data starting at position 1 and destructively overwriting each other's previously written data. For example the script:
Code:
#!/bin/ksh
exec 2>/some/file
exec 1>/some/file
echo ab
echo oops >&2
echo cd

ends up with the following stored in the file named /some/file:
Code:
oopcd

These 2 Users Gave Thanks to Don Cragun For This Post:
MadeInGermany RudiC
 

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LEARN ABOUT SUNOS

times

times(1)							   User Commands							  times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       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

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10							    15 Apr 1994 							  times(1)
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