How to change the console log level?

Solution Verified - Updated -

Issue

How to change the log level of console?

see rhel5 Deployment guide, section "5.3.9.3. /proc/sys/kernel/", the bit about "printk"
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Deployment_Guide/Red_Hat_Enterprise_Linux-5-Deployment_Guide-en-US.pdf

Environment

Red Hat Enterprise Linux 5

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