Empty a text file from the command line
This will create a new file named t whose contents is the word “test”:
$ echo “test” > t
more will display the contents of the file:
$ more t
cat reads the contents of /dev/null (which contains nothing) and > writes this into t
$ cat /dev/null > t
The next time you open your file its contents will be empty. Windows users take notice — when you run the command “cat /dev/null” Windows will throw an error. However, it will still successfully empty the contents of your file.
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