Linux Learning Note 7_ Basic command review 2 (seq sed awk)

Command usage: Displays the contents of 20 to 30 lines of the file

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Seq

Generating sequences

SEQ >[file name] Generates a sequence of 1~100 rows:

1

2

3

...

100

Note:

The sequence starts at 1 only when the maximum value is defined above

SEQ 0 100 starts from 0, sequence order follows natural number order

Seq-1 100 starting from-1:-1 0 1 ... 100

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Sed

Stream Editor Stream editors

Sed-n ' 20,30p ' [file name] prints 20 to 30 lines of content in a file

Note:

CENTOS6, Print command character P in citation: Sed-n ' 20,30 ' p [file name]

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Awk

Line processor

awk ' nr>19&&nr<31 ' [file name] displays 20 to 30 rows

awk ' nr==30 ' [file name] shows line 30th

Note: ' = = ' judgment equals, ' = ' is assigned

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Grep

Filter commands

Filter commands can also be used to filter

Extended review:

grep 20-a [file name] Filters the 20th line of the printed file and displays 20 rows after 10 lines (total 11 lines)

grep 30-b [file name] Filters the 30th line of the printed file and displays the first 10 rows of 30 rows (total 11 lines)

grep 25-c 5 [file name] filters the 55th line of the printed file and displays 5 lines (11 rows) before and after 25 lines

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Head tail

Filter commands

Extended review:

head-30 [The results of the first 30 rows of the file name]|tail-11 print files pass through the channel to the tail command, print the end 11 lines

Linux Learning Note 7_ Basic command review 2 (seq sed awk)