How to copy both stdout and stderr to a file with timestamp from within a bash script?

Question

I've used this answer, which only copies stdout to file:

$ cat /etc/dehydrated/syncNexusCertificatesHook.sh 
#!/bin/bash -ex

exec &> >(ts '[%Y-%m-%d %H:%M:%S]' | tee -a /var/log/dehydrated.log >&2 )
...

When running the script, there was a perl: warning: Setting locale failed. printed to the terminal, but not to the log file.

I want to have all output from the script printed with a timestamp printed to the console as well as saved to the log file. How can I achieve this?

Alongside tou want both in log file, do you want anything to the console? — thanasisp, Oct 19 '20 at 10:52
@Digvijay S do I need to replace the >&2 in the end as well? — mles, Oct 19 '20 at 10:58
In the console, do you want timestamps with the output or the timestamps are only for the log file? — thanasisp, Oct 19 '20 at 11:04

score 1 · Accepted Answer · answered Oct 19 '20 at 12:03

To redirect both stdout and stderr of a command to a sequence of commands, and finally to both the console and a file, you can do it with this syntax

command |& ts '[%Y-%m-%d %H:%M:%S]' | tee file

which is the synonym of this

command 2>&1 | ts '[%Y-%m-%d %H:%M:%S]' | tee file

or redirecting both streams to a process substitution

command &> >(ts '[%Y-%m-%d %H:%M:%S]' | tee file)

or redirecting the output and then make the stderr a copy of stdout

command > >(ts '[%Y-%m-%d %H:%M:%S]' | tee file) 2>&1

1 Answers1