How to stop redirection in bash

I use :

exec >script.log 2>&1

in my script to redirect all output to a file. At the end of the script I would like to print a message to the screen. How do I stop the redirection?

Answers:

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Method 1

You can call exec again to restore the original descriptors. You’ll need to have saved them somewhere.

exec 3>&1 4>&2 1>script.log 2>&1
… logged portion …
exec 1>&3 2>&4
echo >&2 "Done"

Inside the logged portion, you can use the original descriptors for one command by redirecting to the extra descriptors.

echo "30 seconds remaining" >&3

Alternatively, you can put the logged portion of your script inside a compound command and redirect that compound command. This doesn’t work if you want to use the original descriptors in a trap somewhere within that redirected part.

{
… logged portion …
} >script.log 2>&1
echo >&2 "Done"

Method 2

Use additinal fd 3 and 4 for stdout and stderr and simply redirect 1 and 2 to them at the end of your script:

exec 3>&1 4>&2
exec >script.log 2>&1

echo "Some code"

exec >&3 2>&4
echo "Done"

Method 3

First you should check whether or not you have a tty at all.

if tty -s; then
    echo "Hello, World" > $(tty)
fi

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0