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replace strings in a file

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# 1  
Old 08-07-2008
replace strings in a file
Hi

I want to change the following

passwd: files nis
group: files nis


in /etc/nsswitch.conf

to be

passwd: files compat
group: files compat


I tried

cp -p nsswitch.conf nsswitch.conf.old

sed -e 'sSmilieasswd\: files nisSmilieasswd\: files compat:g' -e 's:group\: files nis:group\: files compat:g' nsswitch.conf.old > nsswitch.conf

It only changes passwd not group:

passwd: files compat
group: files nis

could you please advise?

thank you
# 2  
Old 08-07-2008
Code:
sed 's/nis/compat/' filename

# 3  
Old 08-07-2008
hi

but there are other occurences of 'nis' string while I want to change only 2 occurences.

thx
# 4  
Old 08-07-2008
I tried this

cp -p nsswitch.conf nsswitch.conf.old
sed -e '/<passwd>/!s/passwd\(.*\)/passwd\: files compat/' \
-e '/<shadow>/!s/shadow\(.*\)/shadow\: files compat/' \
-e '/<group>/!s/group\(.*\)/group\: files compat/' \
nsswitch.conf


but this changes also

netgroup: files nis

to

netgroup: files compat
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