Question 38038 in Ubuntu Question posted in
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How to replace part of URL without knowing it beforehand using sed/awk? – Ubuntu

How do I replace part of url string without knowing beforehand what the string would be ? For example below is Ubuntu mirror. I want to set mirror to my liking.

Basically, I want replace (jp, us provided as an example, I think for every country they have their own ubuntu mirrors).

deb http://us.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://us.archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal-updates multiverse

deb http://jp.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://jp.archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu/ focal-updates multiverse

deb http://archive.ubuntu.com/ubuntu focal multiverse
# deb-src http://archive.ubuntu.com/ubuntu focal multiverse
deb http://archive.ubuntu.com/ubuntu focal-updates multiverse
# deb-src http://archive.ubuntu.com/ubuntu focal-updates multiverse

To following.

deb http://mirror.sg.gs/ubuntu focal multiverse
# deb-src http://mirror.sg.gs/ubuntu focal multiverse
deb http://mirror.sg.gs/ubuntu focal-updates multiverse
# deb-src http://mirror.sg.gs/ubuntu focal-updates multiverse

deb http://mirror.sg.gs/ubuntu focal multiverse
# deb-src http://mirror.sg.gs/ubuntu focal multiverse
deb http://mirror.sg.gs/ubuntu focal-updates multiverse
# deb-src http://mirror.sg.gs/ubuntu focal-updates multiverse

deb http://mirror.sg.gs/ubuntu focal multiverse
# deb-src http://mirror.sg.gs/ubuntu focal multiverse
deb http://mirror.sg.gs/ubuntu focal-updates multiverse
# deb-src http://mirror.sg.gs/ubuntu focal-updates multiverse

Possibly with sed, awk.

Tags:

3

Answers


  1. 0

    An easy solution for perl:

    perl -pe 's/([^s/]+.)?archive.ubuntu.com/mirror.sg.gs/g'

    Explanation: This replaces an optional part of (non-space and non-slashes followed by a .) before archive.ubuntu.com by mirror.sg.gs.

    If you prefer sed:

    sed -E 's#(https?://)[^/]*archive.ubuntu.com#1mirror.sg.gs#'

    Explanation: This sed command replaces everything between http:// or https://, followed by an optional part (of no slashes), ending with archive.ubuntu.com with your host.

    Here are the two examples updating /etc/apt/sources.list in-place:

    perl -i -pe 's/([^s/]+.)?archive.ubuntu.com/mirror.sg.gs/g' /etc/apt/sources.list
sed -Ei 's#(https?://)[^/]*archive.ubuntu.com#1mirror.sg.gs#' /etc/apt/sources.list

    I would however replace everything incl. the URL scheme (http/https/ftp). That’s also easier to read:

    perl -pe 's/s.*archive.ubuntu.com/ http://mirror.sg.gs/g'
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  2. 0

    This solution replaces everything between the "" and the first "" (not including these three ""s), then replaces the first 3 ""s (the "" and the first "") with temporary "~"s, then removes the remaining "/"s, then replaces the three temporary "~"s with ""s:

    cat input2.txt | sed 's/(^.*//)([^/]*)(.*$)/1mirror.sg.gs3/' | sed 's///~/' | sed 's///~/' | sed 's///~/' | sed 's////g' | sed 's/~///g'
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  3. 0

    Using any sed:

    $ sed 's#([^ ]* http://)[^ ]*#1mirror.sg.gs/ubuntu#' file
deb http://mirror.sg.gs/ubuntu focal multiverse
# deb-src http://mirror.sg.gs/ubuntu focal multiverse
deb http://mirror.sg.gs/ubuntu focal-updates multiverse
# deb-src http://mirror.sg.gs/ubuntu focal-updates multiverse

deb http://mirror.sg.gs/ubuntu focal multiverse
# deb-src http://mirror.sg.gs/ubuntu focal multiverse
deb http://mirror.sg.gs/ubuntu focal-updates multiverse
# deb-src http://mirror.sg.gs/ubuntu focal-updates multiverse

deb http://mirror.sg.gs/ubuntu focal multiverse
# deb-src http://mirror.sg.gs/ubuntu focal multiverse
deb http://mirror.sg.gs/ubuntu focal-updates multiverse
# deb-src http://mirror.sg.gs/ubuntu focal-updates multiverse
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