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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Am Fri, Jan 14, 2022 at 02:38:22PM +0000 schrieb russian sky:

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

Yes. Based on the explanation of '*' in the gawk manual, it's
used to match zero/one/more times repeating of the preceding character which in turn doesn't match the default
diff printing mode( >for removing, <for adding).

Why would it not match? . means “any character”.

It's not necessary to add '*' to '/^>.*(=|Linux)/'.

I think it is.

“.*” basically means “any string of any length, including 0. “.” means
“exactly one character”.

So your original pattern will match '>somestuff=', '> a=', and even

Linux'. But without the *, it will only match if there is that one

character between > and = or Linux. Acutally, diff adds a space after the >,
so your expression will only match lines starting with '> =' or with '>
Linux'.

I’d actually replace gawk with sed, because the output of your gawk command leaves the space in. If an example output for diff is:
6,7c6
< CONFIG_CC_IS_GCC=y
< CONFIG_GCC_VERSION=110100
---

CONFIG_CC_IS_GCC=n

Then your line returns:
CONFIG_CC_IS_GCC=n

If you use `sed -n 's/^> //p'` instead, the output will become: CONFIG_CC_IS_GCC=n

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Please do not share anything from, with or about me on any social network.

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

Agree with that, i will attempt to add an replacing
adivce to the talking page of the kernel/upgrade wiki
page.

I don�t quite follow. Do you mean the �.*�, so you replace .* with .?

Yes. Based on the explanation of '*' in the gawk manual, it's
used to match zero/one/more times repeating of the preceding character which in turn doesn't match the default
diff printing mode( >for removing, <for adding). It's not
necessary to add '*' to '/^>.*(=|Linux)/'.

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<div class="PlainText">&gt; This, in my opinion, is a case of �useless use of cat�.<br>
&gt; `cat somefile | sort` can be replaced by �sort file�.<br>
Agree with that, i will attempt to add an replacing</div>
<div class="PlainText">adivce&nbsp; to the talking page of the kernel/upgrade wiki</div>
<div class="PlainText">page.</div>
<div class="PlainText"><br>
</div>
<div class="PlainText">&gt; I don�t quite follow. Do you mean the �.*�, so you replace .* with .?<br>
Yes. Based on the explanation of '*' in the gawk manual, it's</div>
<div class="PlainText">used to match zero/one/more times repeating of the preceding character which in turn doesn't match the default</div>
<div class="PlainText">diff printing mode( &gt;for removing, &lt;for adding). It's not <br>
</div>
<div class="PlainText">necessary to add '*' to '/^&gt;.*(=|Linux)/'.<br>
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