Open or see the content of a .txt with adb shell android

The following command will work too:-

adb pull {absolute path to directory/file}

cat filename

A few different options, but if you just want to dump to the console try:

cat dados.txt

To show it on the phone screen the command is this:

am start --user 0 -a android.intent.action.VIEW -d file:///data/local/tmp/file.txt -t text/plain