regex - how to extract substring from file with multiple lines -


i trying extract os name /etc/os-release contains:

... name="os name" ...

but when execute:

sed 's/.*name="\([^"]*\).*/\1/' /etc/os-release

it correctly capture os name, prints other lines intead of printing captured string, why?

content of os-release file

cat /etc/os-release  name="centos linux" version="7 (core)" id="centos" id_like="rhel fedora" version_id="7" pretty_name="centos linux 7 (core)" ansi_color="0;31" cpe_name="cpe:/o:centos:centos:7" home_url="https://www.centos.org/" bug_report_url="https://bugs.centos.org/"  centos_mantisbt_project="centos-7" centos_mantisbt_project_version="7" redhat_support_product="centos" redhat_support_product_version="7"

sed command should output "centos linux" outputs lines:

$ sed 's/.*name="\([^"]*\).*/\1/' /etc/os-release centos linux version="7 (core)" id="centos" id_like="rhel fedora" version_id="7" centos linux 7 (core) ansi_color="0;31" cpe:/o:centos:centos:7 home_url="https://www.centos.org/" bug_report_url="https://bugs.centos.org/"  centos_mantisbt_project="centos-7" centos_mantisbt_project_version="7" redhat_support_product="centos" redhat_support_product_version="7"

you can use -n option suppress regular output , /p mode in s command print result on particular line:

sed -ne 's/^name="([^"]+)".*/\1/p' /etc/os-release  centos linux

you can use awk:

awk -f '["=]+' '$1=="name"{print $2}' /etc/os-release  centos linux

or using grep -op:

grep -op '^name="\k[^"]+' /etc/os-release

Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more