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I entered same command with a variable host. During 2nd time I entered blank space between host,= and $. Why it was trying to connect to a server ? Also, when I write like $(host name), I am getting error Host = not found: 3(NXDOMAIN) centos

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It would be useful to know what is the output of hostname? – Julie Pelletier yesterday
    
@JuliePelletier Output is centos. For first time it gives output correctly when entered without space. But during second time as you can see it tries to connect to a server and then prints the output centos. – abc yesterday
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There must not be any spaces between a variable name and the equation mark. When there are spaces, the variable name is interpreted as a command, in this case the command host is run with parameters = and the host name.

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