Linux: su: Authentication failure
When you try to login to a user using su, you get "su: Authentication failure" message
Unix
- Colors: Purple Color
Linux: Check memory usage in percentage
Check ram memory usage linux
Which process is using a port
The 443 port is used by SAP processes :
How to Change SSH Port When Selinux is Enable on Oracle Linux 7
SSH service runs on 22 port number. You can change this port number for security.
How to find user memory usage in linux
This one-liner worked at least four different Linux systems with different distros and versions.
How to Run Cron Every 5 Minutes, Seconds, Hours, Days, Months
Question: How do I execute certain shell script at a specific intervals in Linux using cron job? Provide examples using different time periods.
How to manually clean up shared memory / semaphors
This procedure may be useful for something like Oracle database, SAP or Peoplesoft when application was shutdown but shared memory hasn't been cleaned up for some reason.
Unix Usefull commands
Some usefull Unix commands
Solaris: fuser to find users or processes making filesystem umount fail
Before unmounting a filesystem, Solaris checks to ensure that no files are open to prevent loss of data.
Display devices attached to the system
To display all the hardware devices attached to your SUN Solaris system run:
Show system parameters on Solaris
The sysdef utility outputs the current system definition in tabular form.
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