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Why do I get a “Command not found” error when I type the name of an executable file (i.e “a.out”) that is in my current directory?

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Why do I get a “Command not found” error when I type the name of an executable file (i.e “a.out”) that is in my current directory?

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This is probably due to the fact that the current directory is not specified in the list of directories that are searched when a command is given. This list is called your “path”, and you can see it by typing “echo $PATH”. If there is no single dot (‘.’) somewhere in this PATH, then your current directory may be ignored whenever you type a command. such as “a.out”.

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