How to redirect stdout to a log file?

How to redirect stdout to a log file?

I’m trying to redirect the stdout and stderr to a log file. The filename should be created dynamically with current timestamp. A command substitution, $ (…), will be replaced by the output of the command inside. What you used was a sub-shell, (…).

How to log all stderr output in crontab?

I can append > /var/log.txt 2>&1 to all scripts, but it’s not good if I have hundreds of scripts in cron. Is there another, more simple way to do this? In crontab, you can set MAILTO to point to a mail alias that runs a script. That script would accept a mail message, strip off the headers and other goop, and log the remainder with logger.

How to redirect output to a file from within Cron?

In your /etc/cron.d/example1 config file, the command must use /bin/sh syntax. Specifically any shell redirection must be /bin/sh syntax. If you try to use for example csh shell redirect syntax in your /etc/cron.d/example1, then your cron job will never run.

How to use csh shell redirect in Cron?

If your user has shell csh or zsh or ksh set for his login shell. In your /etc/cron.d/example1 config file, the command must use /bin/sh syntax. Specifically any shell redirection must be /bin/sh syntax. If you try to use for example csh shell redirect syntax in your /etc/cron.d/example1, then your cron job will never run.

How to add timestamp while redirecting stdout to?

I’ve done some research and the furthest I could get was thanks to How to add timestamp to STDERR redirection. It redirects stdout but the timestamp added is of the time when the script finishes: It seems that server output is flushed after exit of the program. (without redirecting it works fine).

How to add stderr output to log.txt file?

Again, using ts from moreutils, you can just use exec at the top of your script. If I understand your problem is to have stderr output included in your log.txt file. Right ? If that’s what you want the solution is:

Is it possible to redirect server output without redirecting?

It seems that server output is flushed after exit of the program. (without redirecting it works fine). Also if I try using predate.sh on given example in mentioned thread, it works perfectly.

I know how to redirect stdout to a file: this will put the ‘test’ into the foo.log file. Now I want to redirect the output into the log file AND keep it on stdout i.e. it can be done trivially from outside the script: but it didn’t work.

How to redirect script output to stdout?

$log_file will contain the output of the script and any subprocesses, and the output will also be printed to the screen. > (…) starts the process and returns a file representing its standard input. exec &> redirects both standard output and standard error into for the remainder of the script (use just exec > for stdout only).

How to log the output of a script?

This would run date and uptime and pipe the output of both to tee which would write the data to the file example.log in the current user’s home directory, and to the standard output of the script. The { …; } is used to combine a set of commands into a “compound command” that can be redirected as a whole.

How to redirect output to a log file in Bash?

In a bash script, how can I redirect all standard outputs to a log file and tee the output on the screen using exec ? This code redirect all the log to the log file but not to the screen . $log_file will contain the output of the script and any subprocesses, and the output will also be printed to the screen.