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I have test file where i have some entries like below and i need to change memberUid to nisNetgroupTriple along with the names

$ cat testfile2

memberUid: tony

memberUid: jacob

memberUid: zenny

memberUid: helori

memberUid: honies

memberUid: hunter

However, i'm able to change the memberUid to nisNetgroupTriple with unix sed like %s/memberUid/nisNetgroupTriple/g and the angain using awk like awk '{print $1, "(-,"$2",)"}' testfile2 but this two way process and i'm this can be done more elegantly which i'm not getting now.

Desired Output:

nisNetgroupTriple: (-,tony,)

nisNetgroupTriple: (-,jacob,)

Try this:

sed -r 's/^memberUid: (.*)/nisNetgroupTriple: (-,1,)/' testfile2 

nisNetgroupTriple: (-,tony,)

nisNetgroupTriple: (-,jacob,)

nisNetgroupTriple: (-,zenny,)

nisNetgroupTriple: (-,helori,)

nisNetgroupTriple: (-,honies,)

nisNetgroupTriple: (-,hunter,)

Using sed with search and replace and a capturing group (.*).
In the replacement string we just construct your desired format, and the 1 fills in what was captured in the parenthesis.

As you asked for an answer using Python3, here is one using Python regex:

import re

f = open(testfile2).read()

re.sub(r'(memberUid)(:s)(w+)',r'nisNetgroupTriple2(-,3,)',f)

Explanation:

• 
  re is the Python's regex module providing re.sub method which replaces a pattern with another pattern in the provided string in the following manner:
  
  
  
  
  • re.sub(r'original-pattern', r'replacement-pattern', inputString)
  
  
  
  


• The brackets used in the pattern are used for capturing groups in the original pattern. E.g. in our case, we have captured 3 groups: memberUid, :s and w+. Then, we can reference back to these groups in our replacement pattern as 1, 2 and so on.

As the first part of each input line will always be replaced, the sed is redundant. All you need is

awk '{print "nisNetgroupTriple: (-,"$2",)"}'