Re: [gentoo-user] wiki page(kernel/upgrade) command confusion: 'cat' and 'awk'

[Frank Steinmetzger]

Am Fri, Jan 14, 2022 at 10:05:54AM +0000 schrieb russian sky:
> the sentence is just as follows:
>
> diff <(cat .config | sort) <(cat .config.old | sort) | awk '/^>.*(=|Linux)/ { $1=""; print }'
>
> without inserting the 'cat' and '*'(the part of awk),It seems like, the result of the command is the same as before.
>
>
> Does the existence of the aboving 'cat'

This, in my opinion, is a case of “useless use of cat”.
`cat somefile | sort` can be replaced by “sort file”.

> and '*' (the part of awk)

I don’t quite follow. Do you mean the “.*”, so you replace .* with .?

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