## Advanced File Reading

### Searching
*   `findstr`: The Windows grep.
    *   `findstr "password" config.txt`: Search for string.
    *   `findstr /S /I "password" *.txt`: Recursive (/S) and Case-Insensitive (/I) search in all text files.

### Redirection
*   `>`: Overwrite. `echo hello > file.txt`.
*   `>>`: Append. `echo world >> file.txt`.
*   `|`: Pipe. `type log.txt | findstr "error"`.

### Attributes
Files can be Hidden.
*   `attrib`: Show attributes.
*   `attrib +h file.txt`: Hide it.
*   `attrib -h file.txt`: Unhide it.