Is there a way in Linux/Unix bash to turn off output or redirect to a file

jimwelc · 01-04-2005, 04:19 PM

Hello,

I am currently writting a bash script in which I would like to have the ability to run in a silent mode. I come from the windows world and I was hoping there was something like echo ON/echo OFF type command.

Along with this option I would to log everything that was supposed to go to standard out to go to a file. I tried to use the commands "script filename" and "tee filename" but they don't seem to work correctly.

Any help anyone can provide will be greatly appreciated.

Thank you,

-Jim

twantrd · 01-04-2005, 04:22 PM

If you want to run a script and direct output to a file it's:

./script_name > scriptlog.txt

If you run a script and wish to append output to a file it's:

.,/script_name >> scriptlog.txt

-twantrd

__J · 01-04-2005, 04:28 PM

redirect it to /dev/null

racer_mec · 01-05-2005, 12:28 AM

after the command give the redirect to any file.
like ls > null
this will direct the output of ls to a file named null.

theYinYeti · 01-05-2005, 01:41 AM

Here's how you do it from the script itself.
"echo off" style:

Code:

#!/bin/bash

# redirect stdout(1) and stderr(2) to null:
exec 1>/dev/null 2>/dev/null

...the remainder of your script...

logfile style:

Code:

#!/bin/bash

# redirect stdout(1) and stderr(2) to logfile:
exec 1>/path/to/logfile 2>&1

...the remainder of your script...

Yves.

jimwelc · 01-05-2005, 01:51 PM

Hello all,

I really appreciate everyones responses to my inquire. I think Yves is the route I am going to take, but I was wondering if there is a way to redirect stdout and stderr to screen as well as a file?

Best Regards,
-Jim

theYinYeti · 01-06-2005, 03:56 AM

In theory (but I did not try):

Code:

#!/bin/bash

# redirect stdout(1) and stderr(2) to logfile and stdout:
exec 1> >(tee /path/to/logfile) 2>&1

...the remainder of your script...

Yves.