How to write output to stdout and log file?

How to write output to stdout and log file?

The /tmp/both.log is appended unless you remove the -a from tee. Hint: > (…) is a process substitution. It lets the exec to the tee command as if it were a file. I wanted to display logs on stdout and log file along with the timestamp. None of the above answers worked for me.

How to write a message to both the console and the log file?

to write a message to both the console and the log file – tee sends its output to both its own fd 1 (which here is the LOG_FILE) and the file you told it to write to (which here is fd 3, i.e. the console). Example: into the log file. It worked just as you suggested.

How to pass the output of a command as an argument?

I generally use `command` to place it’s output as argument to another command. For e.g., to find resource consumed by process foo on freebsd will be: Here, pgrep is used to extract the PID of process foo which is passed to procstat command which expects PID of process as argument.

Why do I need env file instead of log file?

Due to the above code in env file all the console outputs that might be user outputs or errors are directly output to the log file which is what I actually needed. But there are some selective user outputs which I want to be displayed in both the console and the log file.

How to redirect output to the log file?

In Unix shell, I have a env file ( env file defines the parameters required for running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc) which redirects all the outputs ( echo messages) and errors to the log file from the executed script using the following code:

How to create a log file in Bash?

Log file will be created in first run and keep on updating from next runs. In case log file missing in future run , script will create new log file. I have found a way to get the desired output. Though it may be somewhat unorthodox way. Anyways here it goes.

What should file path be given in logging command?

File paths should be given as absolute paths: rooted to a drive on Windows, or beginning with / on Linux and macOS. Please note that there is no support of ‘set -x’ command being executed before logging command on Linux and macOS.