UNIX command line redirection

The UNIX redirection symbols, “ <” and “>”, provide a similar mechanism to the -i and -o options.

For example:
isql -Usa < input > output
You can direct isql to take input from the terminal, as shown in this example:
isql -Usa -Ppassword -Sserver_name << EOF > output use pubs2
select * from table
<<EOF” instructs isql to take input from the terminal up to the string “EOF.” You can replace “EOF” with any character string. Similarly, the following example signals the end of input with Ctrl-d:
isql -Usa << > output