CODEWITHSUNDEEP
bashawk
catchvenki
catchvenki

Reputation: 35

bash script appending data after comma

I have a test file with following contents.

[groups]

test_read =  apple,orange
write = grapes,mango
[TEST:/]
@test_read= apple,orange
@write= grapes,mango

I need to add the word raspberry on all the fields under groups section which is above [TEST:/]

Expected output

[groups]

    test_read =  apple,orange,raspberry
    write = grapes,mango,raspberry
    [TEST:/]
    @test_read= apple,orange
    @write= grapes,mango

I tried with this one liner 

awk 'NF > 1 {$NF = $NF ",raspberry"} 1' test

But it is adding raspberry on all the fields.

Upvotes: 0

Views: 95

Answers (4)

Ed Morton
Ed Morton

Reputation: 203219

$ awk '/\[/{f=/groups/} f{if (NF) $0=$0",raspberry"} 1' file
[groups],raspberry

test_read =  apple,orange,raspberry
write = grapes,mango,raspberry
[TEST:/]
@test_read= apple,orange
@write= grapes,mango

Upvotes: 1

Jose Ricardo Bustos M.
Jose Ricardo Bustos M.

Reputation: 8164

You can use match in gawk

awk 'f && /=/{$0=$0 ",raspberry"}
     match($0, /^\[([^\]]*)\]$/, a){f=(a[1]=="groups")}1' file

you get,

[groups]

test_read =  apple,orange,raspberry
write = grapes,mango,raspberry
[TEST:/]
@test_read= apple,orange
@write= grapes,mango

Upvotes: 0

Kent
Kent

Reputation: 195039

awk '/\[groups/{a=1;print;next} /^\[/{a=0}a && /=/{$0=$0",raspberry"}7' file

This line works no matter where is the groups block located. (E.g. is above or under the TEST block).

Upvotes: 0

anubhava
anubhava

Reputation: 784968

You can use this sed command:

sed '1,/\[TEST:\/\]/{/=/s/$/,raspberry/;}' file

[groups]

test_read =  apple,orange,raspberry
write = grapes,mango,raspberry
[TEST:/]
@test_read= apple,orange
@write= grapes,mango

To save the changes inline use:

sed -i.bak '1,/^[ \t]*\[TEST:\/\]/{/=/s/$/,raspberry/;}' file

How it works:

1,/^[ \t]*\[TEST:\/\]/  # search between 1st line and the line where [TEST:/] is found
{
   /=/                  # only act on line where = is found (fields)
   s/$/,raspberry/;     # replace end of line with ,raspberry 
}

Upvotes: 0

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