I want to find common line in two files and replace the next line of first file with the next line of second file. (sed,awk,perl,bash any solution is welcomed ) Case Ignored. Multiple Occurrence of same line.

File 1:

         hgacdavd
sndm,ACNMSDC
msgid "Rome"
msgstr ""
kgcksdcgfkdsb
msgid ""
hsdvchgsdvc
msgstr ""
dhshfjksdfhmd
msgid "Vidya"
msgstr ""
sdjhcbnd
dcndnv
cfnkdndvrknvkf
dfkvrnkdfnk
snfvrkng
msgid "Rome"
msgstr ""
wdbhkjbcfj
#dmcdmf
f,nvdf,

fvnfnvk
vfmf,mv
vfn

msgid "vid"
msgstr ""
dmcbdmbcvmfbvmkhsdk

file 2:

  dfhkvgjbfrvkf  
msgid "Rome"
msgstr "new bie"
sdbsjbcdcbwoido
fjcdcvnm
msgid "vidya"
msgstr "expert"
dvnjfkdvhnkfvnknsbdjh


msgid "vid"
msgstr "newton"
dfenfjdbrfjbvlfnvl
dcnkncvkdfvknfv
fcndkbvknfkv
vfdnkvnfknbvkfn

Later File 1 should be:

          hgacdavd
sndm,ACNMSDC
msgid "Rome"
msgstr "new bie"
kgcksdcgfkdsb
msgid ""
hsdvchgsdvc
msgstr ""
dhshfjksdfhmd
msgid "Vidya"
msgstr "expert"
sdjhcbnd
dcndnv
cfnkdndvrknvkf
dfkvrnkdfnk
snfvrkng
msgid "Rome"
msgstr "new bie"
wdbhkjbcfj
#dmcdmf
f,nvdf,

fvnfnvk
vfmf,mv
vfn

msgid "vid"
msgstr "newton"
dmcbdmbcvmfbvmkhsdk

awk 'NF{i=tolower($0)} NR==FNR{A[p]=$0; p=i; next} i in A{getline x; $0=$0 ORS A[i]}1' file2 file1
works fine for above file..but I am facing problem if both file contains almost similar contents,eg:
file1:

         hgacdavd
sndm,ACNMSDC
msgid "Rome"
msgstr ""
kgcksdcgfkdsb
msgid ""
hsdvchgsdvc
msgstr ""
dhshfjksdfhmd
msgid "Vidya"
msgstr ""
sdjhcbnd
dcndnv
cfnkdndvrknvkf
dfkvrnkdfnk
snfvrkng
msgid "Rome"
msgstr ""
wdbhkjbcfj
#dmcdmf
f,nvdf,

fvnfnvk
vfmf,mv
vfn

msgid "vid"
msgstr ""
dmcbdmbcvmfbvmkhsdk

file2:

         hgacdavd
sndm,ACNMSDC
msgid "Rome"
msgstr "new bie"
sdbsjbcdcbwoido
kgcksdcgfkdsb
msgid ""
hsdvchgsdvc
msgstr ""
dhshfjksdfhmd
msgid "vidya"
msgstr "expert"
sdjhcbnd
dcndnv
cfnkdndvrknvkf
dfkvrnkdfnk
snfvrkng
msgid "Rome"
msgstr "new bie"
sdbsjbcdcbwoido
wdbhkjbcfj
#dmcdmf
f,nvdf,

fvnfnvk
dvnjfkdvhnkfvnknsbdjh


msgid "vid"
msgstr "newton"
dfenfjdbrfjbvlfnvl
dmcbdmbcvmfbvmkhsdk

after exection..file1 should be:

  hgacdavd
sndm,ACNMSDC
msgid "Rome"
msgstr "new bie"
kgcksdcgfkdsb
msgid ""
hsdvchgsdvc
msgstr ""
dhshfjksdfhmd
msgid "Vidya"
msgstr "expert"
sdjhcbnd
dcndnv
cfnkdndvrknvkf
dfkvrnkdfnk
snfvrkng
msgid "Rome"
msgstr "new bie"
wdbhkjbcfj
#dmcdmf
f,nvdf,

fvnfnvk
vfmf,mv
vfn

msgid "vid"
msgstr "newton"
dmcbdmbcvmfbvmkhsdk
Search msgstr "" pattern in file1
       take its previous line, find this line in file2 
if found then replace the next line of file1 with next line of file2

Thats the only thing i want to do...for all those msgstr with null value,i want to search its relevant value from file2 and replace the null with the value.
Please provide me implementation logic.

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