Grep text between patterns using bash [closed] - bash

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I need to sort data which reside in txt file. The sample data is as follows:
======
Jhon
Doe
score -
------
======
Ann
Smith
score +
------
======
Will
Marrow
score -
------
And I need to extract only sections where score + is defined. So the result should be
======
Ann
Smith
score +
------

Answer 1

I would try this one:
$ grep -B3 -A1 "score +" myfile
It means... grep three lines Before and one line After "score +".

Answer 2

Sed can do it as follows:
sed -n '/^======/{:a;N;/\n------/!ba;/score +/p}' infile
======
Ann
Smith
score +
------
where -n prevents printing, and
/^======/ { # If the pattern space starts with "======"
:a # Label to branch to
N # Append next line to pattern space
/\n------/!ba # If we don't match "------", branch to :a
/score +/p # If we match "score +", print the pattern space
}
Things could be more properly anchored with /\n------$/, but there are spaces at the end of the lines, and I'm not sure if those are real or copy-paste artefacts – but this work for the example data.

Answer 3

give this oneliner a try:
awk -v RS="==*" -F'\n' '{p=0;for(i=1;i<=NF;i++)if($i~/score \+/)p=1}p' file
with the given data, it outputs:
Ann
Smith
score +
------
The idea is, take all lines divided by ====... as one multiple-line record, and check if the record contains the searching pattern, print it out.

Answer 4

With GNU awk for multi-char RS:
$ awk -v RS='=+\n' '/score \+/' file
Ann
Smith
score +
------

Answer 5

Given:
$ echo "$txt"
======
Jhon
Doe
score -
------
======
Ann
Smith
score +
------
======
Will
Marrow
score -
------
You can create a toggle type match in awk to print only the section that you wist:
$ echo "$txt" | awk '/^=+/{f=1;s=$0;next} /^score \+/{f=2} f {s=s"\n"$0} /^-+$/ {if(f==2) {print s} f=0}'
======
Ann
Smith
score +
------

Answer 6

Use Grep Context Flags
Assuming you have a truly fixed-format file, you can just use fgrep (or GNU or BSD grep with the speedy --fixed-strings flag) along with the the --before-context and --after-context flags. For example:
$ fgrep -A1 -B3 'score +' /tmp/foo
======
Ann
Smith
score +
------
The flags will find your match, and include the three lines before and one line after each match. This gives you the output you're after, but with a lot less complexity than a sed or awk script. YMMV.