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Hello I have a file called users. In that file i have a list of users for example

user1
user2
user3

Now i have another file called searches where there is a specific string called owner = user for example

owner = user1
random text
random text
owner = user15
random text 
random text 
owner = user2

so is it possible to find all the users based on the users file and rename those users to [email protected] ? for example

owner = [email protected]
random text
random text
owner = user15
random text 
random text 
owner = [email protected]

i got some bits and pieces working using the ack command and the cat command but i am new to programming so i cant get a proper output. What i figured out is below but it does not really do what i need. any help is highly appreciated.

cat users | xargs -i sed 's/{}/moo/' searches
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  • Removing the completely unrelated loop-device. Please make sure you read the tag descriptions before using a tag. While the approach you're sketching is certainly viable, we're not really a "free code" service! If I had a recommendation for how to approach this class of problem, it would probably not entail learning shell scripting (as you're currently proposing), but learning a more universally useful language such as Python. This specific problem is a bit easier in Python, and if you're new to programming, that might be the more useful thing to learn. Commented Mar 22, 2022 at 6:53

2 Answers 2

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Try awk:

awk 'NR == FNR {SRCH[$1]; next} $NF in SRCH {$NF = $NF "@domain.com"} 1'   users searches
owner = [email protected]
random text
random text
owner = user15
random text 
random text 
owner = [email protected]

It adds the addendum if user found in users file.

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  • Ma man... This is pure gold. this is exactly what i was trying to do. Commented Mar 22, 2022 at 13:37
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Use awk:

awk '
  NR==FNR{users[$0]=$0"@domain.com"}
  NR>FNR && $1 == "owner" && $3 in users { $3=users[$3]; }
  NR>FNR
' users searches

To edit file directly, append > searches.tmp && mv searches.tmp searches

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  • hello, thanks for replying. i am getting a xargs: illegal option -- a i tried in /bin/bash as well. still the same error. Commented Mar 22, 2022 at 8:23
  • probably -a is GNU find ... Commented Mar 22, 2022 at 8:26
  • This opens and writes the "searches" file umpteen times, even is a user is not found at all. Commented Mar 22, 2022 at 8:37
  • Changed answer completely to use awk. Commented Mar 22, 2022 at 9:06

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