tee command in Unix

In this article, we will be discussing the use cases of the tee  Unix command with examples.

tee command

tee   – Used in the middle of a pipeline, this command allows you to both redirect output to a file, and pass it to further commands in the pipeline.

How to use tee command

 Examples: $check_patch_logs.ksh | tee check.log| more   

The output of check_patch_logs.ksh is stored in the filecheck.log, and also pass it to more to display it one screen at a time.

-a option with tee command

By default, the tee command overwrites the file.

ls | tee x.txt

The above command will overwrite the file x.txt if it exists

You can instruct tee command to append to the file using the option –a

ls | tee -a x.txt

Now this will create a new file x.txt if it does not exists, if it exists, it will append to it

How to use tee to write to multiple files

We just need to specify the files name

ls | tee x.txt x1.txt x2.txt

it will store the output of ls in all these files.

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