cat Concatenate files and print on the standard output sort Sort lines of text files
    uniq Report or omit repeated lines
    cut Remove sections from each line of files
    paste Merge lines of files


    join Join lines of two files on a common field
    comm Compare two sorted files line by line
    diff Compare files line by line
    patch Apply a diff file to an original
    tr Translate or delete characters
    sed Stream editor for filtering and transforming text
    aspell Interactive spellchecker