CODEWITHSUNDEEP
linuxsedawk
user3147180
user3147180

Reputation: 943

How can i replace text with sed by matching previous line

I have this file:

user_default:
    resource: "@UserDefaultBundle/Controller/"
    type:     annotation
    prefix:   /
Other_default:
    resource: "@PeopDefaultBundle/Controller/"
    type:     annotation
    prefix:   /

I want to replace the prefix under user_default to /user

I know how I can replace in single line, but I don't know how to check the previous lines.

Upvotes: 1

Views: 156

Answers (4)

BMW
BMW

Reputation: 45243

Using sed

sed -r '/user_default:/{:a;N;/prefix/!{/\n\S/!ba};s!(prefix:\s*).*!\1/user!}' file

This command will avoid to apply the change to wrong session, if "prefix" is not exist in user_default session.

Upvotes: 0

potong
potong

Reputation: 58430

This might work for you (GNU sed):

sed -r '/^\S/{h;b};G;/^user_default:/M{s/(prefix:\s*\S).*/\1user/};P;d' /file

This copies a section header into the hold space and thereafter appends it to lines within that section. If the line contains both user_default: and prefix: it does the required substitution.

N.B. It uses the multi-line switch M to check that the section header begins with the required label.

EDIT: Missed the obvious!:

sed -r '/^user_default:/,/^\s*prefix:/{s/\(prefix:\s*).*/\1\/user/}' file

Upvotes: 1

Ell
Ell

Reputation: 947

This AWK solution should work, change the variables accordingly.

awk -v p="prefix:" -v x="user_default:" '{
{!/^[[:space:]]/ && NF=1 && a=$NF}
{if ((a==x) && ($0~p))
sub(/\//,"/user")}
}1' filename

Upvotes: 0

Zsolt Botykai
Zsolt Botykai

Reputation: 51613

Basically it's not that easy with sed, but it's doable (see this answer and modify to suit to your needs if sed is the only option). I'd recommend to use awk for this job, like:

awk '/^user_default:/ { print ; ud=1 ; next}
     /^ +resource:/ && ud==1 {print gensub("@UserDefaultBundle","/user",1) ; ud=0 ; next }
     { print }' INPUTFILE

Upvotes: 0

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