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In a set we can easily remove lines which contains search pattern or we can them for example third or

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fourth line or any other number line.

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So it started.

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But firstly let's check how our final table the text looks like.

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Now let's remove all the lines which contains pattern ID.

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So what I set as an address is a regular expression for searching I-T.

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And as a common use D which means move and we can of course need to specify an input file table to text

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and we see that lines containing I-T that are removed.

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Great.

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Now let's recheck how Luke's content of table file we see everything.

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Without any change as we only removed 80 lines from being printed in standard output.

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We didn't change the actual file.

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Now open our table file and change your name from lowercase to uppercase

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and we can use the same command we use previously for deleting lines containing staying I-T

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VC dead the first line was also removed.

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Which is correct because it has Potten ID invert unit but would like to keep first line Berzon.

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So let's change our address with search but then we need to specify address to match lines only with

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the unit we can do that by adding up before I-T.

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Because when I created the file I used stop instead of spaces to make table more readable if used spaces

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between words age and event.

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You can use blank or space character class instead.

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So that's the right set as a command.

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Use the

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for others use character class.

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For example space

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followed by vord I the

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and do a change for file table got text

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and great.

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We see that first line is present and only lines with the unit were removed.

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Valks perfectly.