sort – Sort lines of text files
Sort the file contents based on options given to it. By default the output is shown in the console.
$ sort — Take the input from stdin, sort and output in stdout.
$ sort myfile -o myoutput — Sort the myfile content and store in “myoutput”
$ sort -b myfile — Ignore the leading blanks and sort.
$ sort -br myfile — Same as above but in reverse order
$ sort -c myfile — Only Check whether myfile is already sorted
$ sort -f myfile — Ignore the case and sort (a == A)
$ sort -u myfile — Sort and output only unique lines
$ sort -t : -k 2,2n -k 5.3,5.4 myfile — Sort numerically on the 2nd field and resolve ties by sorting alphabetically on the 3rd and 4th characters of field 5. Use `:’ as the field delimiter
Read : man sort