Re: Output redirection?

[Chris F.A. Johnson]

On Fri, 27 Jan 2006, Yuri Karlsbrun wrote:

> Hello,
>
> I, probably, need bash-help mailing list, but I could not find it.

   The best place is the Usenet news group, comp.unix.shell.

> Here is the bash script fragment:
> LOG_FILE="./logfile"
> ...
> > $LOG_FILE

    That statement will create an empty file if it does not exist, and
    truncate it to zero bytes if it does exist.

> I supposed that the statement above redirects stdout to the logfile.
> But the following 'echo' statement prints on the screen.

    To redirect the output of a command:

echo SOMETHING > "$LOG_FILE"


    To redirect several commands, enclose them in braces:

{
   echo "Today's date:"
   date
} > "$LOG_FILE"

> The logfile is opened.

    If you want all succeeding output to go be redirected, use exec:

exec > "$LOG_FILE"

echo "THIS 'n' THAT"   ## <-- This will be sent to "$LOG_FILE"

--
   Chris F.A. Johnson                      <http://cfaj.freeshell.org>
   ===================================================================
   Author:
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)