Command inputs

Using the nzsql command, you can specify different input options:

To run a single query from the command line, enter:
```
   nzsql -c "SELECT * FROM test_table"
```
On the NPS system or UNIX clients, to read input from the current source, for example a script, enter:
```
nzsql <<eof
SELECT * FROM test_table;
eof
```
To read input (standard in), enter:
```
nzsql < foo.sql
```
To run queries from a file (command-line argument), enter:
```
nzsql -f foo.sql
```
To run queries from a file (nzsql option), enter:
```
   NZSQL
\i foo.sql
```