SED Advanced Command Small note

SED advanced command:

G: Copy the contents of the hold space into the pattern space, where the contents of the original pattern space are overwritten

G: After append the contents of hold space to the pattern space\n

H: Copy the contents of the pattern space into hold space, and the contents of the space are overwritten

H: Append the contents of the pattern space to the hold space\n

D: Delete all lines in pattern and read into the next line into pattern

[[Email protected]:bash]# seq 5 | Sed '/2/{h;d};/4/{g} '

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[[Email protected]:bash]# seq 5 | Sed '/2/{h;d};/4/{g} '

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n command: Reads the next line to pattern space.

n command: Adds the next line to the pattern space.

P Command: Prints the first line of the template block.

Seq 5 | Sed-n ' N; P

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Seq 5 | Sed-n ' N; P

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Seq 5 | Sed-n ' $! N P

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Note: $! n is where n does not work on the last line.

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SED Advanced Command Small note