Command Line sqlplus without using @filename

Question

How can I pass sql statement directly to sqlplus on command line without using an external file ?

Answer 1

If the insert happens infrequently, then the cost of writing
to a temporary file may not matter overall. And if the
insert happens frequently, the cost of invoking SQL*Plus and
connecting to the DB could outweigh the time for writing to
a file.
Do you have any problem doing something like:
tail -f mylog.txt | myawkprog | sqlplus -s scott/tiger
Here I'm thinking that 'myawkprog' prints appropriate INSERT
and COMMIT statements.
For what it is worth, I have an old, old Perl 4 script for a
similar log parsing task. It keeps the SQL*Plus connection
alive forever and makes sure there is no I/O buffering. The
outline of it is below. Use at own risk.
-- CJ
#! /usr/local/bin/perl -w
# Open I/O pipes
open(LG, "tail -f /tmp/mylog.txt|") || die "Can't open input";
open(SP, "| sqlplus -s scott/tiger") || die "Can't open sqlplus";
# unbuffered I/O
select(LG); $| = 1;
select(SP); $| = 1;
while(<LG>)
chop;
print SP "insert into mytab values ('$_');\n";
print SP "commit;\n";
# Never actually get here
close(LG);
close(SP);