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error message

My CentOS Apache 2 (httpd) webserver will not start. It was working fine but I made few changes to httpd.conf and it is not restarting. What are some things to check in order to solve my issues?
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Q. I'm getting an error as follows while trying to run a shell script over remote ssh session:

./myscript.sh
/bin/bash: bad interpreter: Text file busy

How do I fix this error message and run the script?
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Linux Error: Page Allocation Failure and Solution

Q. How do I get rid of an error message that read as - "Page allocation failure"?
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Q. When ever I try to login to my remote Debian Linux server called in013.example.com, I get the following error message in /var/log/auth.log file:

Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))
Jul 1 17:04:36 in013 sshd[14447]: Public key 48:de:55:22:xx:yy:zz:yy:xx:yy:zz:yy::88:e8:87:47 blacklisted (see ssh-vulnkey(1))

I'm using Ubuntu Linux as desktop operating system. How do I fix this error?
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Q. How do I redirect stderr to stdout? How do I redirect stderr to a file?
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Q. When I type the following command under CentOS 4.x / Fedora Linux:
enable hplj2
I see the error message:
-bash: enable: hplj2: not a shell builtin
How do I fix this error?
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Q. While installing any FreeBSD port I'm getting following error message:
....
===> FreeBSD WARNING: Vulnerability Database Out of Date, Checking Anyway
...

How do I fix this warning message?
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