Sed command not replacing with multiline from file-CodePudding

I'm trying to replace a bloc in a file (file1) from another one coming from a second file (file2). File2 contains multiline, let's say:

Print 1
Print 2

I'm using this command:

file2="$(cat file2)"
sed -i "/Do_something/,/^}/c\
 echo ${file2} " ${file1}

The good thing is that it works but it replaces it in a single line. How can I replace with multiline? I tried to put directly the variable but It doesn't work, it works only with 'echo'. Also if I add double quotes, it's doesn"t work.

CodePudding user response：

You don't need to read file2 in a shell variable. Just get it done in sed using r file command:

sed -e '/Do_something/,/^}/{/^}/!d; r file2' -e 'd;}' "$file1"

CodePudding user response：

This might work for you (GNU sed):

sed -e '/Do_something/{:a;N;/^}/M!ba;r file2' -e 'd}' file1

Replace the lines between one containing Do_something and another beginning } with the contents of file2.

N.B. The replacement will only take place if both matches are made, otherwise the default action will be leave the file untouched i.e. the N command will reach end-of-file and print the contents of the pattern space.

CodePudding user response：

Using any awk in any shell on every Unix box you could do (untested since you didn't provide sample input/output we could test with):

awk '
    NR==FNR { new = (NR>1 ? new ORS : "") $0; next }
    /Do_something/ { f=1 }
    f && /^}/ { $0=new; f=0 }
    !f
' file2 file1

That above assumes that if you have Do_something in the input then you will also have a subsequent } since nothing in your question suggests otherwise.

If you want to replace the contents of file1 with the output of that command then just add > tmp && mv tmp file1 to the end of the command.