How to replace a string in a file with contents of another file?

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07-04-2014

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How to replace a string in a file with contents of another file?

Hi,

I have to replace a string in my first file with contents of second file. Second file has 5 lines in it.

file1.txt

Code:

This is the first file.
 LineToBeReplaced
 This is the last line of the first file.

file2.txt

Code:

This is line1 of the second file.
 This is line2 of the second file.
 This is line3 of the second file.
 This is line4 of the second file.
 This is line5 of the second file.

file after script should look like.

Code:

This is the first file.
This is line1 of the second file.
This is line2 of the second file.
This is line3 of the second file.
This is line4 of the second file.
This is line5 of the second file.
This is the last line of the first file.

Please suggest if this can be achieved through shell script or should i check for any other options like perl or other tools.

Thanks,
Vijay.

Last edited by Scrutinizer; 07-05-2014 at 03:58 AM.. Reason: CODE tags

vijay14

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07-04-2014

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Code:

awk 'NR == FNR {a[FNR] = $0; n++; next}
  /LineToBeReplaced/ {for(i = 1; i <= n; i++) {print a[i]}; next}1' file2.txt file1.txt

---------- Post updated at 10:44 PM ---------- Previous update was at 10:43 PM ----------

Below is the run output

Code:

Srinivas@Snow ~/download/log$ cat file2.txt
This is line1 of the second file.
This is line2 of the second file.
This is line3 of the second file.
This is line4 of the second file.
This is line5 of the second file.
Srinivas@Snow ~/download/log$ cat file1.txt
This is the first file.
LineToBeReplaced
This is the last line of the first file.
Srinivas@Snow ~/download/log$ awk 'NR == FNR {a[FNR] = $0; n++; next}
  /LineToBeReplaced/ {for(i = 1; i <= n; i++) {print a[i]}; next}1' file2.txt file1.txt
This is the first file.
This is line1 of the second file.
This is line2 of the second file.
This is line3 of the second file.
This is line4 of the second file.
This is line5 of the second file.
This is the last line of the first file.
Srinivas@Snow ~/download/log$

SriniShoo

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07-05-2014

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Try also

Code:

sed '/Replaced/ {r file2
; d}' file1
This is the first file.
This is line1 of the second file.
This is line2 of the second file.
This is line3 of the second file.
This is line4 of the second file.
This is line5 of the second file.
This is the last line of the first file.

RudiC

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07-05-2014

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Code:

while IFS= read -r line
  do
  case $line in
    *LineToBeReplaced*) cat file2 ;;
    *) printf "%s\n" "$line"
  esac
done < file1 > newfile

Variation to RudiC's approach:

Code:

sed -n '/LineToBeReplace/!{p;d;}; r file2' file1 > newfile

Scrutinizer

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