insert lines based on a pattern using awk

Question

I have a flat file1 in below format

Keyword:
First line

Keyword:
line1 
Line2

Keyword:
abc
def
jkl

Keyword:
123456
opertxt

I am using the below awk command and getting the output in file2

awk 'BEGIN { RS = "Keyword:" } {$1=$1} 1' file1 > file2

file2 looks like this

First line
line1 Line2
abc def jkl
123456 opertxt

I do not want to output like this, instead I want the output like the below pattern, the line with the keyword to be removed

First line

line1 
Line2

abc
def
jkl

123456
opertxt

can someone suggest a solution using awk or sed. Thanks

A web search for [delete lines matching pattern](https://www.google.co.in/search?q=linux+delete+lines+matching+pattern) gives a __lot__ of results. — devnull, May 12 '14 at 09:04
possible duplicate of [Sed - Delete a line containing a specific string](http://stackoverflow.com/questions/5410757/sed-delete-a-line-containing-a-specific-string) — devnull, May 12 '14 at 09:07

score 2 · Accepted Answer · edited May 23 '17 at 12:13

2

You can use either of these:

sed '/^Keyword:$/d' file

sed looks for lines being exactly Keyword: and deletes them.

awk '$0 == "Keyword:" {next} 1' file

It checks lines that are exactly Keyword: and skips them with next. Then 1 is True, so it performs the default awk action: {print $0}.

Or better and shorter (thanks Jaypal!):

awk '$0 != "Keyword:"' file

Output:

$ awk '$0 == "Keyword:" {next} 1' file
First line

line1
Line2

abc
def
jkl

123456
opertxt

$ sed '/^Keyword:$/d' file
First line

line1
Line2

abc
def
jkl

123456
opertxt

edited May 23 '17 at 12:13

Community

1
1

answered May 12 '14 at 09:05

fedorqui

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once i get the output using sed '/^Keyword:$/d' file can is remove blank line using ? sed '/^\n$/d' file – user3489905 May 12 '14 at 09:10
Do you also want to remove blank lines? You can use either `sed 's/^$/d' file` or `awk 'NF>=1'` – fedorqui May 12 '14 at 09:13
1

yes i wanted to remove all the blank lines. Thanks. I will use the sed command. – user3489905 May 12 '14 at 09:20
+1 for two solutions. The `awk` can be written as `awk '$0!="Keyword:"' file` – jaypal singh May 12 '14 at 19:09
Oh @jaypal, makes sense and it is even better. Updating, thanks! – fedorqui May 14 '14 at 14:03

insert lines based on a pattern using awk

1 Answers1

Output: