Find and replace in AIX 5.3 - file

Question

I am running AIX 5.3.
I have two flat text files.
One is a "master" list of network devices, along with their communication settings(CLLIFile.tbl).
The other is a list of specific network devices that need to have one setting changed, within the main file(specifically, cn to le). The list file is called DDM2000-030215.txt.
I have gotten as far as looping through DDM2000-030215.txt, pulling the lines I need to change with grep from CLLIFile.tbl, changing cn to le with sed, and sending the output to a file.
The trouble is, all I get are the changed lines. I need to make the changes inside CLLIFile.tbl, because I cannot disturb the formatting or structure.
Here's what we tried, so far:
for i in 'DDM2000-030215.txt'
do
grep -p $ii CLLIFile.tbl| sed s/cn/le/g >> CLLIFileNew.tbl
done
Basically, I need to replace all instances of 'le' with 'cn', within 'CLLIFile.tbl', that are on lines that contain a network element name from 'DDM2000-030215.txt'.

Answer 1

Your sed (on AIX) will not have an -i option (edit the input file),
and you do not want to use a temporary file.
You can try a here construction with vi:
vi CLLIFile.tbl >/dev/null <<END
:1,$ s/cn/le/g
:wq
END

Answer 2

You don't want grep here, because, as you've observed, it only outputs the matching lines. You want to just use sed and have it do the replacement only on the lines that match while passing the other lines through unchanged.
So instead of this:
grep 'pattern' | sed 's/old/new/'
just do this:
sed '/pattern/s/old/new/'
You will have to send the output into a new file, and then move that new file into place to replace the old CLLIfile.tbl. Something like this:
cp CLLIfile.tbl CLLIfile.tbl.bak # make a backup in case something goes awry
sed '/pattern/s/old/new/' CLLIfile.tbl >newclli && mv newclli CLLIfile.tbl

Answer 3

EDIT: Entirely new question, I see. For this, I would use awk:
awk 'NR == FNR { a[++n] = $0; next } { for(i = 1; i <= n; ++i) { if($0 ~ a[i]) { gsub(/cn/, "le"); break } } print }' DDM2000-030215.txt CLLIFile.txt
This works as follows:
NR == FNR { # when processing the first file
# (DDM2000-030215.txt)
a[++n] = $0 # remember the tokens. This assumes that every
# full line of the file is a search token.
next # That is all.
}
{ # when processing the second file (CLLIFile.tbl)
for(i = 1; i <= n; ++i) { # check all remembered tokens
if($0 ~ a[i]) { # if the line matches one
gsub(/cn/, "le") # replace cn with le
break # and break out of the loop, because that only
# needs to be done once.
}
}
print # print the line, whether it was changed or not.
}
Note that if the contents of DDM2000-030215.txt are to be interpreted as fixed strings rather than regexes, you should use index($0, a[i]) instead of $0 ~ a[i] in the check.