CODEWITHSUNDEEP
shellunixsed
chingupt
chingupt

Reputation: 413

search a keyword in file and replace line next to it

I have a file which requires modification via a shell script.

Need to do the following: 1. search for a keyword in the file. 2. replace the next line to this keyword with my supplied line text.

for e.g., my file has the following text:

(some text) (some text) (text_to_search) (text_to_replace) (some text) (some text) (some text)

I need to search the file for and rewrite the file replace the line leaving the remaining content untouched.

How can this be done?

Regards

Upvotes: 1

Views: 674

Answers (3)

jim mcnamara
jim mcnamara

Reputation: 16399

awk ' zap==1 {print "my new line goes here"; zap=0; next}
      /my pattern/ {zap=1; print $0; next}
      {print $0} '  infile > newfile

Assuming I got what you wanted....

   var="this is the line of text to insert" 
   awk -v lin="$var"  ' zap==1 {print lin ; zap=0; next}
          /my pattern/ {zap=1; print $0; next}
          {print $0} '  infile > newfile

the awk internal variable lin, defined: -v lin="$var" is named lin, lin comes from the external bash variable var.

Upvotes: 2

Sidharth C. Nadhan
Sidharth C. Nadhan

Reputation: 2253

   cat file

first
second
third
fourth
fiveth

set var = "inserted"
sed '/second/a\'$var file

first
second
inserted
third
fourth
fiveth

Upvotes: 0

Sidharth C. Nadhan
Sidharth C. Nadhan

Reputation: 2253

 sed -i '/pattern/r/dev/stdin' file

the script will wait for us to enter the newline and press ctrl +d interactively +

Upvotes: 0

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