Oracle binaries hanging

I've installed Oracle Client 10GR2 on Red Hat Enterprise Linux AS release 4 (Nahant Update 2).
But oracle binaries like sqlplus, imp, exp are hanging.
I've set ORACLE_HOME correctly. I've tried running sqlplus -VERBOSE but this hangs as well.
Any idea what could be the problem?

Am running Oracle 10GR2 on Red Hat Enterprise Linux ES release 4 (Nahant Update 5).
No problems with connectivity. Database instance is running fine and so are the client binaries.
There were some issues like installing/enabling kernel async_io - but these would only be applicable if you're trying to run an Oracle instance.
Are you connecting to a local instance, or are you using a network connection?
If a local connection, SQL*Plus will (via OCI) launch an oracle process from $ORACLE_HOME/bin and attached itself to it. That process will be the dedicated server process for SQL*Plus.
If a network connection, SQL*Plus will open a tcp connection (via OCI) to the Oracle server platform.
Obviously, "hanging" when connecting means a very different software layer for each.
You will need to supply some more detail. A copy and paste of the actual ssh/telnet session that hangs, the environment settings (ORACLE_HOME, TNS_ADMIN, ORACLE_SID, etc), and details of the type of connection (if a network connection, the TNS alias definition), and so on.

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