cat command

How do I display all my environment variables using bash shell on RHEL / Debian / Ubuntu / CentOS / Fedora / Mint Linux operating systems?

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I‘m a new Unix user. How do I create a file from bash prompt without using GUI tools? How to create a file in Unix from terminal window? What’s the easiest and best way to create a file in Unix?

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How do I find out how many nfs clients are connected to NFS server running on Red Hat Enterprise Linux?

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I‘m a new Linux sys admin and I’m unable to find the command to list all users on my RHEL server. What is the command to list users under Linux operating systems?

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cat command

I am a new Linux and Unix system user. How do I use cat command on Linux or Unix-like operating systems? Can you provide basic examples and syntax usage for cat command?

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I made some changes to the /etc/squid/squid.conf file and issued the command /sbin/service squid restart. However, this command takes way too much time to restart the server. How do I tell squid to just reread the config file and apply new changes under Linux operating systems?

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How do I find out that how many files are open and how many allowed in Linux server operating systems?

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