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Scientific Linux

When I run 'yum install package' or 'yum update' commands the yum command works normally until Running Transaction Test and hangs until the yum process is killed manually using the kill command. How do I fix this problem under CentOS Linux 5.x AMD64 running on HP server?
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How do I install whois client to see whois information about domain and ip address using command line options under Fedora / RHEL / Redhat / CentOS / Scientific Linux?
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I've edited /etc/ssh/sshd_config to change the port number:

Port 1255

However, I'm getting an error as follows:

sshd[26792]: error: Bind to port 1255 on failed: Permission denied

How do I change default OpenSSH port number from 22 to 1255 under RedHat Enterprise Linux server version 6 and SELinux?
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RHEL 6: semanage SELinux Command Not Found

I'm trying to use semanage command to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources under RHEL 6 server. But, I'm not able to find out this command and/or package name. How do I install semanage command under RedHat Enterprise Linux?
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I'm getting the following error while compiling application under CentOS / RHEL / Fedora Linux 64 bit edition:

/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h:

No such file or directory

How do I fix this error and compile my applications using gcc under RHEL / Fedora / CentOS Linux 64bit system?
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