How to query pgsql from a BASH script ?

Hello *,

I am puzzeling around, how to query a postgresql from a BASH script.
Generaly it must do nothing else as

1)  Get VALUEs from a DB/TABLE
    e.g.
    program --db pgsql.sld.tld --search "$COLNAME,$VAL" \
                               --get "COL1,COL3,COL4,..."

2)  Write one or more new VALUEs in the DB/TABLE
    e.g.
    program --db pgsql.sld.tld --search "$COLNAME,$VAL" \
                               --set "COL1:VAL1,COL3:VAL3,..."

3)  Remove ROWS from the DB/TABLE
    e.g.
    program --db pgsql.sld.tld --search "$COLNAME,$VAL" --remove


Curently I have only a sulution with a text/plain file but
there is a problem with locking and the file is already
180 kByte, which mean grep/cut/sed are to slow for it.

Under "heavy" load I need to access the database around
1-3 times (maybe in the future more) per second.

Any suggestions ?

Greetings
Michelle

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