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I have two files...

First File Input...

1 How many steps are in programming?
A.5
B.4
C.3
D.9
Ans.

2 How many stairs in room?
A.6
B.10
C.15
D.23
Ans.

Second File Input...

1. Who is outside of the room ?
A.john
B.Mary
C.Scot
D.Fery
Ans.

2. Which day is today ?
A.Mon
B.Wed
C.Friday
D.Sunday
Ans.

I need Output like...

1 How many steps are in programming?
A.5
B.4
C.3
D.9
Ans.

1. Who is outside of the room ?
A.john
B.Mary
C.Scot
D.Fery
Ans.

2 How many stairs in room?
A.6
B.10
C.15
D.23
Ans.

2. Which day is today ?
A.Mon
B.Wed
C.Friday
D.Sunday
Ans.

I am using command ...

sed -e '/Ans./r file2' -e:n -e 'n;bn' -e file1

But the second o/p from 2 is reversed

1 How many steps are in programming?
A.5
B.4
C.3
D.9
Ans.

1. Who is outside of the room ?
A.john
B.Mary
C.Scot
D.Fery
Ans.

**2. Which day is today ?**
A.Mon
B.Wed
C.Friday
D.Sunday
Ans.

**2 How many stairs in room?**
A.6
B.10
C.15
D.23

You can get pretty close using awk in paragraph mode, with getline (it doesn't quite preserve the record separators - you may be able to do better with GNU awk, using the RT variable):

$ awk 'BEGINRS=""; ORS="nn" print; if( (getline < "second") > -1) print' first
1 How many steps are in programming?
A.5
B.4
C.3
D.9
Ans.

1. Who is outside of the room ?
A.john
B.Mary
C.Scot
D.Fery
Ans.

2 How many stairs in room?
A.6
B.10
C.15
D.23
Ans.

2. Which day is today ?
A.Mon
B.Wed
C.Friday
D.Sunday
Ans.

You may achieve this with awk

awk -v RS='' '
 FNR == NR block[NR] = $0; next 
 print block[FNR] "nn" $0 "n" 
' file1 file2

Blocks are separated by empty lines (RS=''). First line (FNR == NR) stores the blocks of file1 into the block array. For each block of file2, the second line prints the corresponding block in file1 then the block in file2.

Notes:

• I'm assuming each file contains the same number of text blocks


• For a proper formatting, ensure that the last block in each file is followed by en empty line.

If there is a different number of blocks in each file, here is a (admittedly hackish) solution using bash and GNU tools sed and paste:

paste -z -d 'n' <(sed -z 's/nn/nx00/g' file1) <(sed -z 's/nn/nnx00/g' file2)

The sed commands append a zero byte to the block separators (empty lines). paste uses that zero byte as a delimiter and prints each block in turn, separating them with a new line.

Here is a script and output to illustrate the use of standard utility paste for this. First the simple case of pasting lines alternately from 2 separate files. Then all we need to do is make the paragraph, stanza input into a single line and use the paste method. The gathering of lines in a group into a "superline" is done with a short perl script that transforms each line by replacing the newline with some other character, in this case "@". Then we paste, and then we separate the superlines back into paragraphs. This is a useful tehcnique because most *nix commands operate at the line level. It is useful enough, in fact, that at our shop we have a utility "masuli" to make such superlines.

The data files are smaller in the interest of conserving visual space.

#!/usr/bin/env bash

# @(#) s1 Demonstrate modular approach to multi-line data, perl, paste.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() for _i;do printf "%s" "$_i";done; printf "n"; 
pl() pe;pe "-----" ;pe "$*"; 
em() pe "$*" >&2 ; 
db() ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "n" ) >&2 ; 
db() : ; 
C=$HOME/bin/context && [ -f $C ] && $C paste perl

pl " Input data file data[12]:"
 head data[12]

pl " Results, proof of concept:"
paste -d'n' data[12]

pl " Input data files data[34]:"
head data[34]

pl " Results, collect, paste, separate:"
paste -d'n' <( perl -00 -wp -e 's/n/@/g;s/@@/=n/' data3 ) 
 <( perl -00 -wp -e 's/n/@/g;s/@@/=n/' data4 ) |
tee f1 |
perl -000 -wp -e 's/@/n/g;s/=/nn/g;s/nnn/nn/g'

exit 0

producing:

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution : Debian 8.9 (jessie) 
bash GNU bash 4.3.30
paste (GNU coreutils) 8.23
perl 5.20.2

-----
 Input data file data[12]:
==> data1 <==
1.1
1.2

==> data2 <==
2.1
2.2

-----
 Results, proof of concept:
1.1
2.1
1.2
2.2

-----
 Input data files data[34]:
==> data3 <==
3.1a
3.1b

3.2a
3.2b


==> data4 <==
4.1a
4.1b

4.2a
4.2b


-----
 Results, collect, paste, separate:
3.1a
3.1b

4.1a
4.1b

3.2a
3.2b

4.2a
4.2b

Best wishes ... cheers, drl