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memory

How do I check the ram size from my Redhat Linux desktop system using command line and GUI tools? How do I find out memory size on Red Hat Enterprise Linux server?
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I'm using the ldd command to get information about /usr/local/nginx/sbin/nginx binary and I see linux-gate.so.1 library. However, I'm unable to find out this file anywhere on the system? What is linux-gate.so.1 and how do I copy this file?
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How do I execute a script under UNIX or Linux like operating system using command prompt?
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Shut Down a Solaris UNIX System

How do I shutdown a Solaris UNIX machine or server using command prompt?
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I'm running the command yum update -y and getting the following error:

Loaded plugins: fastestmirror, priorities
Existing lock /var/run/yum.pid: another copy is running as pid 523.
Another app is currently holding the yum lock; waiting for it to exit...

The other application is: yum-updatesd-he
Memory : 14 M RSS ( 26 MB VSZ)
Started: Tue Feb 9 08:19:02 2010 - 14 day(s) 11:47:39 ago
State : Sleeping, pid: 523
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: yum-updatesd-he
Memory : 14 M RSS ( 26 MB VSZ)
Started: Tue Feb 9 08:19:02 2010 - 14 day(s) 11:47:41 ago
State : Sleeping, pid: 523

How do I fix this problem?
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