Linux Shell Scripting Cookbook - Third Edition

How to do it...

1. Use the greater-than symbol to append text to a file:

        $ echo "This is a sample text 1" > temp.txt

This stores the echoed text in temp.txt. If temp.txt already exists, the single greater-than sign will delete any previous contents.

2. Use double-greater-than to append text to a file:

        $ echo "This is sample text 2" >> temp.txt

3. Use cat to view the contents of the file:

        $ cat temp.txt
        This is sample text 1
        This is sample text 2

The next recipes demonstrate redirecting stderr. A message is printed to the stderr stream when a command generates an error message. Consider the following example:

$ ls +
ls: cannot access +: No such file or directory

Here + is an invalid argument and hence an error is returned.

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