awk - Adding brackets after paricular string

Question

I want to add () after the equal symbol as shown below.

actual variable in a file : vm_names=vm1 vm2 vm3

i want to change it to: vm_names=(vm1 vm2 vm3)

I tried the below command but its giving different output

sed -i 's/.*/(&)/' file_name

O/p: (vm_names=vm1 vm2 vm3)

question from:https://stackoverflow.com/questions/65920926/adding-brackets-after-paricular-string

Answer 1

You can use

sed -i 's/=(.*)/=(1)/' file_name

Details

• =(.*) - matches = and then captures into Group 1 the rest of the string
• =(1) - replaces with =( + Group 1 value and a ).

See an online demo:

s='vm_names=vm1 vm2 vm3'
sed 's/=(.*)/=(1)/' <<< "$s"
# => vm_names=(vm1 vm2 vm3)