how to ignore glogin.sql and login.sql when sqlplus connects

I have a shell script, which has contents as follows: 

#===============

sqlplus_output=`sqlplus / as sysdba <<-EOF

-- some sql statements here.

exit;

EOF`

# parse sqlplus_output

# shell commands

#=================

And I have a glogin.sql under $ORACLE_HOME/sqlplus/admin, which includes some commands like 

# ==========

set feedback on;

select name from v$database;

alter session set container=xxx;

# ==================

Since sqlplus always execute glogin.sql before execute my commands in the shell script, The output of glogin.sql has added some unrequired content to sqlplus_output.

Question: 

is there an approach to ignore glogin.sql and login.sql when sqlplus connects? 

Note: I can not remove or update the existing glogin.sql or login.sql, as they are used by other applications. I only want they are ignored when sqlplus is executed by my shell script.