The most common cat options are:
Let’s see how to create a file with just a few lines of text:
$cat > teste.txt
You can now type any text. When finished, press Ctrl d on an empty line to finish entering data and save the teste.txt file.
To view the content of the newly created file:
$ cat teste.txt
Cat can also be used to concatenate files.
$ cat texto1.txt > texto.txt
Note that in this example the contents of the texto.txt file are replaced with texto1.txt.
To add the content of the texto1.txt to the end of the texto.txt file the correct one would be:
$ cat texto1.txt >> texto.txt
Shows the content of a source code file with numbered lines:
$ cat -n teste.c
1 #include
2int main ()
3 {
4 printf (“Linux certification! n”);
5};
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