find and replace in a file using sed or awk

[krishsays]

Hi ,

I have to do a migration from staging to production. I have 50 files where I need to change the hostnames and urls to new environment hostnames and urls. Please can somebody help me in writing a script using which I can read a hostname1 from a file and then search in a second file and change it with new hostname which is also given in first file. I think we can use array for old and new hostnames , only problem is how to search a array value in the file and replace it with second array value.
Please help, thanks iin advance.

Thanks,
Krishan]

 

[PHV]

A starting point.
Say you have a file named changes.txt like this:
oldhostname=newhostname
oldurl1=newurl1
oldurl2=newurl2
...
Then you may consider a command like this:
awk -F'=' '{
NR==FNR{a[$1]=$2;next}
{x=$0;for(k in a)gsub(k,a[k],x);print x}
' changes.txt /path/to/input > output

Hope This Helps, PH.
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