Alternate for sed -i in AIX


 
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# 8  
Old 01-07-2013
Quote:
Originally Posted by sathyaonnuix
[...]
This works out, can you please explain the code.
Code:
awk 'NR == FNR {
  # while reading the fist input file
  # store the names in an array
  # keyed by the IPs
  iton[$1] = $2
  next
  }
# if the IP has an associated name
# assign its value to $1
# otherwise just return the record
# 1 -> true -> print $0  
($1 in iton && $1 = iton[$1]) || 1
  ' file2 file1 > _tmp_file_ && 
      mv -- _tmp_file_ file1

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