There are many things you can do with the output of a command in Linux. You can assign the output of a command to a variable, send it to another command/program for processing through a pipe or redirect it to a file for further analysis.
In this short article, I will show you a simple but useful command-line trick: how to view output of a command on the screen and also write to a file in Linux.
Viewing Output On Screen and also Writing to a File
Assuming you want to get a full summary of available and used disk space of a file system on a Linux system, you can employ the df command; it also helps you determine the file system type on a partition.
df
With the -h flag, you can show the file system disk space statistics in a “human readable” format (displays statistics details in bytes, mega bytes and gigabyte).
df -h
Now to display the above information on the screen and also write it to a file, say for later analysis and/or send to a system administrator via email, run the command below.
df -h | tee df.log
cat df.log
Here, the magic is done by the tee command, it reads from standard input and writes to standard output as well as files.
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