【原】The Linux Command Line - Redirection

● cat - Concatenate files
● sort - Sort lines of text
● uniq - Report or omit repeated lines
● grep - Print lines matching a pattern
● wc - Print newline, word, and byte counts for each file
● head - Output the first part of a file
● tail - Output the last part of a file
● tee - Read from standard input and write to standard output and files