Creating a Dictionary / Wordlist with Crunch

Creating a Dictionary / Wordlist with Crunch 

Crunch is a useful program for creating and outputting wordlist or dictionaries to be used with brute force attacks. Crunch can send a wordlist to the screen, file, or another program.
Here is how to create a dictionary with Crunch.

The syntax will be:
crunch (min)(max)(charset) -t (pattern) – o (filename.lst)

min = minimum characters that you want to add in your dictionary
max = maximum characters that you want to add in your dictionary
Charset = Which characters you want to add in your wordlist such as abcd or 123456
Pattern = Some characters can be static or dynamic meaning you can specify letters to change or not change.

For example, if I want to create a minimum 7 digits, maximum 7 digits, qwer987 with pattern qwe@@@@ and to save the file in the desktop folder.

The command would be:
crunch 7 7 qwer987 -t qwr@@@@ -o /root/Desktop/ dictionary.txt