Re: Logging of commands in a bash script to a file

[Steve Litt <slitt@troubleshooters.com>]

On Tue, 22 Apr 2014 19:06:41 -0300
Daniel Bareiro <daniel-listas@gmx.net> wrote:

> 
> Hi all!
> 
> I'm writing a bash script that runs several routing commands. I would
> like these commands, on a part of the script, plus run, are saved to a
> log file.
> 
> I guess maybe it could be done by putting the commands in a variable
> and then do:
> 
> $CMD
> echo $CMD
> 
> 
> But perhaps there is a more elegant way to do this in a single line.

Make a function in the bash script something like this:

function do_command(){
  echo -n `date` >> $logfile
  echo $1 $2 $3 $4 $5 $6 >> $logfile
  $1 $2 $3 $4 $5 $6 
}

If you want to record the output of each command, you'd change the
final line to $1 $2 $3 $4 $5 $6  >> $logfile

In the main script, you'd call it like this:

do_command sudo mount -a

I haven't tested this, so you'll need to tighten it up a little, and it
could be made more elegant, but it's a starting point.

HTH,

SteveT

Steve Litt                *  http://www.troubleshooters.com/
Troubleshooting Training  *  Human Performance