Shulou(Shulou.com)06/02 Report--

Seq sequence

Seq 1 5 | tac

When opening a file with vi or vim

Enter again in command mode

: set nu

The line number is displayed.

Use the sed command to print a segment

Data-n means to cancel the default print

Sed-n 20jue 30p tt.txt

Using sed, you can also print only one line.

Sed-n 30p tt.txt-n means to cancel the default print

Use the awk command to print a piece of content Common usage of awk write logic in curly braces in awk'{} 'single quotation marks line number $0 indicates

Print out the content that meets the requirements

Awk'{if (NR > 19&&NR)

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