How to grep second results from text file in Bash?

Question

I have text file with this content:

4

: ID: 5 table: 4 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211' -- 17: ID: 19 table: 7 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211' -- 18: ID: 20 table: 3 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211' -- 19: ID: 21 table: 5 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211'

How I can grep results like this:

4: ID: 5 table: 4 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211'

Then I grep this result :

17: ID: 19 table: 7 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211'

Then I have this result:

18: ID: 20 table: 3 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211'

Then I have this result:

19: ID: 21 table: 5 numplan: no_change accs-cat: no_change cld-rule: $ cld-type: no_change cld-numplan: no_change clg-rule: '----------+79975532211'

I need grep this results in one Bash script. How to do it?

I need get first result, and then next results in my text file

possible duplicate of Grep a file, but show several surrounding lines? — Chris Maes
– Chris Maes, Commented Apr 7, 2015 at 15:09

hek2mgl · Accepted Answer · 2015-04-07 15:46:42Z

This will give you record 4..

grep -A8 '[[:space:]]*4:' file

and so on.. The command takes in to account, that the record will be 8 lines long, -A8 will output the matching line and the 8 lines following it.

You can create a little loop to execute the command for every record of interest and redirect the output of the loop to a text.file:

for i in 4 17 18 19 ; do grep -E -A8 "[[:space:]]*$i:" input.txt done > output.txt

Alternatively you could use awk using a record separator RS="\n *--\n":

awk -F$'\n' '$1 ~ /\y(4|17|18|19):/' RS="\n *--\n" input.txt > output.txt

Darkwind · Accepted Answer · 2015-04-08 07:35:15Z

Thank you! It's work!

I use this:

for i in 4 17 18 19 ; do grep -E -A8 "[[:space:]]*$i:" input.txt done > output.txt

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