Append text to stderr redirects in bash

Question

Right now I\'m using exec to redirect stderr to an error log with

exec 2>> ${errorLog}

The only downside is that I have to start each

Answer 1

You could simple just use:

exec 1> >( sed "s/^/$(date '+[%F %T]'): /" | tee -a ${LOGFILE}) 2>&1

This will not completely solve your Problem regarding Prompt not shown (itt will show after a short time, but not realtime, since the pipe will cache some data...), but will display the output 1:1 on stdout as well as in the file.

The only problem is, that I could not solve, is, to do this from a function, since that opens a subshell, where the exec is useless for the main program...