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Full Discussion: Exec command - what is it doing here?
Top Forums Shell Programming and Scripting Exec command - what is it doing here? Post 302806377 by el_foz on Monday 13th of May 2013 03:27:13 AM
Old 05-13-2013
Code Exec command - what is it doing here?
Hi all,
Forgive me for asking for help with my first post, but I am struggling here. I've been asked to translate a bash script into a Windows script (probably batch or powershell, not sure yet), so the first step is obviously understand what the bash script is doing. But I have no experience in bash, very little in unix/linux, and no unix box to practice on.
I can't figure out the following code:

Code:
hmdir=/home/CBG_VCC_POD/NEVIS/PROD/
timestamp=to_cbg_`date +%y%m%d_%H%M%S`

exec 1>"$hmdir"log/to_cbg_log/${timestamp}.log 2>"$hmdir"log/to_cbg_log/${timestamp}.err

if [ ! -d "$hmdir"Inbound ]; then
	echo "Inbound directory not found!!!" >> "$hmdir"log/to_cbg_log/${timestamp}.err
	echo "Exits..." >> "$hmdir"log/to_cbg_log/${timestamp}.err
	cp "$hmdir"log/to_cbg_log/${timestamp}.err "$hmdir"to_cbg/${timestamp}.err
	exit 1
fi

...

The first two lines obviously setup variables. Following the exec line, the script continues with various if loops to create folders and copy and zip files. So what is the exec line doing?

From what I read, exec starts a new process, executes the passed parameter and then exits, but in this case there is no passed parameter as far as I can tell, and the script does continue after this line.

A colleague postulated that it is setting the output for the following lines in this script to go to the log file in case of a command returning "1" and to an err file in the case of a command returning "2", or something like that. Can anyone clarify?

Many thanks in advance.
Nick
 

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LEARN ABOUT SUSE

gtk2::recentinfo

Gtk2::RecentInfo(3)					User Contributed Perl Documentation				       Gtk2::RecentInfo(3)

NAME

       Gtk2::RecentInfo

HIERARCHY

	 Glib::Boxed
	 +----Gtk2::RecentInfo

METHODS

   timestamp = $info->get_added;
   timestamp = $info->get_modified;
   timestamp = $info->get_visited;
       cut

   integer = $info->get_age
   (exec, count, timestamp) = $info->get_application_info ($app_name)
       o   $app_name (string)

   (applications) = $info->get_applications
   string = $info->get_description
   string = $info->get_display_name
   boolean = $info->exists
   (groups) = $info->get_groups
   boolean = $info->has_application ($app_name)
       o   $app_name (string)

   boolean = $info->has_group ($group_name)
       o   $group_name (string)

   pixbuf = $info->get_icon ($size)
       o   $size (integer)

   boolean = $info->is_local
   string = $info->last_application
   boolean = $info->match ($other_info)
       o   $other_info (Gtk2::RecentInfo)

   string = $info->get_mime_type
   unix timestamp = $info->get_modified
   boolean = $info->get_private_hint
   string = $info->get_short_name
   string = $info->get_uri_display
   string = $info->get_uri
   unix timestamp = $info->get_visited
SEE ALSO

       Gtk2, Glib::Boxed

COPYRIGHT

       Copyright (C) 2003-2008 by the gtk2-perl team.

       This software is licensed under the LGPL.  See Gtk2 for a full notice.

perl v5.12.1							    2010-07-05						       Gtk2::RecentInfo(3)
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