1. The following command sorts the contents of infile with the
second field as the sort key:
sort -k 2,2 infile
2. The following command sorts, in reverse order, the contents
of infile1 and infile2, placing the output in outfile and
using the second character of the second field as the sort
key (assuming that the first character of the second field is
the field separator):
sort -r -o outfile -k 2.2,2.2 infile1 infile2
3. The following command sorts the contents of infile1 and
infile2 using the second non-<blank> of the second field as
the sort key:
sort -k 2.2b,2.2b infile1 infile2
4. The following command prints the System V password file (user
database) sorted by the numeric user ID (the third
<colon>-separated field):
sort -t : -k 3,3n /etc/passwd
5. The following command prints the lines of the already sorted
file infile, suppressing all but one occurrence of lines
having the same third field:
sort -um -k 3.1,3.0 infile
