CODEWITHSUNDEEP
shellsearchsedawkgrep
user1874594
user1874594

Reputation: 2493

Add a specific line after every Nth pattern match .. AWK SED anything you got

I have a file like this 

Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now

Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now


Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now


Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now



Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now

I want to add a line wait after every 3rdh match of "Find a hot chick"

So the above should read.

Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now

Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now


Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
**wait** 
Do the best part now


Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now



Go to Vegas
Play the blackjack
Earn a  lucky wad
Find a hot chick
Do the best part now

After every N the match of a string insert another line ( in this case its "wait" )
How best can it be done I can add a new line after every pattern match but I want to add a specific line after every Nth pattern match Like this 

sed '/"Find a hot chick"/ a\
    wait ' <filename>

Upvotes: 0

Views: 1387

Answers (4)

Jotne
Jotne

Reputation: 41460

A small variation of grebnekes awk version

awk '/Find a hot chick/ && !(++i%3) {$0=$0"\n**wait**"}1' file

This will add a new line for every third hit of pattern to the line itself, then print all.

Upvotes: 1

BMW
BMW

Reputation: 45293

Using sed

sed  '/Find a hot chick/{x;s/^/./;/.\{3\}/{s/.\{3\}//;x;s/.*/&\n**wait**/;b};x}' file

Explanation: (it is called "Dot count") 

/Find a hot chick/ {           # find the key words
    x                          # Exchange the contents of the hold and pattern spaces.
    s/^/./                     # add one dot in hold space. (such as ..$, ...$ etc)
    /.\{3\}/ {                 # check if there are 3 dots in hold space or not.
        s/.\{3\}//             # find the third pattern match, clean the dots in hold space.
        x                      # Exchange the contents of the hold and pattern spaces.
        s/.*/&\n**wait**/      # add the contents OP asked.
        b                      # b label, Unconditionally branch to label. The label may be omitted, in which case the next cycle is started. 
    }
    x                          # Exchange the contents of the hold and pattern spaces.
}

If need be done by awk, here is the awk command more straightforward. 

awk '/Find a hot chick/{k++;if (!(k%3)){$0=$0 RS "**wait**"}}1' file

Upvotes: 1

Mark Setchell
Mark Setchell

Reputation: 207748

Like this:

awk '1;/Find a hot chick/{if(i++==3){print "New line";i=0}}' yourfile

The "1" just does awk's default thing, which is to print, for every line.

Upvotes: 5

gturri
gturri

Reputation: 14629

With awk you could do:

#!/usr/bin/awk -f
BEGIN {
  counter = 0
}

{
  if ( $0 == "Find a hot chick" )
    counter++
  print
  if ( counter == 3 ){
    print "**wait**"
    counter = 0
  }
}

Put it in a file, e.g., file.awk, and then: ./file.awk your_file

Upvotes: 1

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