Add text between two patterns in File using sed command

Question

I want to add Some large code between two patterns:

File1.txt

This is text to be inserted into the File.

i

Answer 1

i think you can try this

$ sed -n 'H;${x;s/Second.*\n/This is text to be inserted into the File\
&/;p;}' infile.txt

Answer 2

awk flavor:

awk '/First/ { print $0; getline < "File1.txt" }1' File2.txt

Answer 3

Since /r stands for reading in a file, use:

sed '/First/r file1.txt' infile.txt

You can find some info here: Reading in a file with the 'r' command.

Add -i (that is, sed -i '/First/r file1.txt' infile.txt) for in-place edition.

To perform this action no matter the case of the characters, use the I mark as suggested in Use sed with ignore case while adding text before some pattern:

sed 's/first/last/Ig' file

---

As indicated in comments, the above solution is just printing a given string after a pattern, without taking into consideration the second pattern.

To do so, I'd go for an awk with a flag:

awk -v data="$(<patt_file)" '/First/ {f=1} /Second/ && f {print data; f=0}1' file

Given these files:

$ cat patt_file
This is text to be inserted
$ cat file
Some Text here
First
First
Second
Some Text here
First
Bar

Let's run the command:

$ awk -v data="$(<patt_file)" '/First/ {f=1} /Second/ && f {print data; f=0}1' file
Some Text here
First                             # <--- no line appended here
First
This is text to be inserted       # <--- line appended here
Second
Some Text here
First                             # <--- no line appended here
Bar

Answer 4

Here's a cut of bash code that I wrote to insert a pattern from patt_file. Essentially had had to delete some repetitious data using uniq then add some stuff back in. I copy the stuff I need to put back in using lineNum values, save it to past_file. Then match patMatch in the file I'm adding the stuff to.

   #This pulls the line number from row k, column 2 of the reduced repitious file       
   lineNum1=$(awk -v i=$k -v j=2 'FNR == i {print $j}' test.txt)    

    #This pulls the line number from row k + 1, coulmn 2 of the reduced repitious file
    lineNum2=$(awk -v i=$((k+1)) -v j=2 'FNR == i {print $j}' test.txt)

    #This pulls fields row 4, 2 and 3 column into with tab spacing (important) from reduced repitious file 
    awk -v i=$k -v j=2 -v h=3 'FNR == i {print $j"  "$h}' test.txt>closeJ.txt

    #This substitutes all of the periods (dots) for \. so that sed will match them
    patMatch=$(sed 's/\./\\./' closeJ.txt)

    #This Selects text in the full data file between lineNum1 and lineNum2 and copies it to a file 

    awk -v awkVar1=$((lineNum1 +1)) -v awkVar2=$((lineNum2 -1)) 'NR >= awkVar1   && NR <= awkVar2 { print }' nice.txt >patt_file.txt 

    #This inserts the contents of the pattern matched file into the reduced repitious file              
    #The reduced repitious file will now grow
    sed -i.bak "/$patMatch/ r "patt_file.txt"" test.txt