VIP: new format for psql - shell - simple using psql in shell

Hello

I proposed new psql's format "shell". This format is optimized for
processing returned result in shell:


postgres=# select * from foo;
      a       | b  |     c
--------------+----+------------
 Hello, World | 10 | 2012-05-26
 Ahoj, Svete  | 20 | 2012-06-15
(2 rows)

postgres=# \pset format shell
Output format is shell.
postgres=# select * from foo;
a b c
Hello,\ World 10 2012-05-26
Ahoj,\ Svete 20 2012-06-15

postgres=# \x
Expanded display is on.
postgres=# select * from foo;
( c l )
( [a]=Hello,\ World [b]=10 [c]=2012-05-26 )
( [a]=Ahoj,\ Svete [b]=20 [c]=2012-06-15 )

shell scripts can looks like:

( psql -t -P format=shell postgres < ${row[$field]}"
      done;
      echo;
    done;)

I invite any comments, mainly from bash or shell experts

Regards

Pavel Stehule