CODEWITHSUNDEEP
stringbashsed
Pedro Gonzalez
Pedro Gonzalez

Reputation: 95

Append string before and after

How could I use bash or sed to put string before and after a match? There are 4 spaces before and \n after the pattern.

Input:

Irrelevant text
    line of code
Irrelevant text

Output

Irrelevant text
    {code}line of code{code}
Irrelevant text

I tried

CONTENT=$(while read -r line;
do     line=${line//'    '/'    {code}'};
line=${line//\n/'{code}'};     
echo $line; done < testfile)

but it is not producing output i want.

Edit: How would I do it if I even wanted to append a different string before and different string after the pattern?

Upvotes: 0

Views: 472

Answers (1)

dash-o
dash-o

Reputation: 14424

Consider using 'sed' on the whole file.

sed -e 's/    \(.*\)$/    {code}\1{code}/'

The s operator will select the text after the spaces in group #1, and will then replace wrapped the captured group (\1) with {code}.

Using sed is significantly more efficient than using bash on a line-by-line basis.

Upvotes: 1

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