To open the Terminal window, open the Finder and select Go>Utilities>Terminal
If you are unaware or unsure of the how to work in the Terminal window, you can access more information at several sources online. For example, basics are available at:
Once you are in the Terminal window and in the directory that has your Fastq files, you can view the short reads with the following command:
# Where the <filename> is the specific name of your file (without the <>).
#This will open the file in the terminal window without having to view it in a text editor.
#You can scroll through the file by hitting Enter or Return. Use the scroll bar to view earlier in the file.
#You can exit out of the file by hitting "Control-C"
Other useful commands include:
>head -n <filename> — will return the first n lines of your file, where "n" is the number of lines to show.
>tail -n <filename> --will return the last n lines of your file, where "n" is the number of lines to show.
>head -10 <filename>
# will bring the first 10 lines of the file up on the screen.
Remember that each sequence has 2 lines of information: the first is a header line that has a description of the sequence and the second line is the sequence.