如何使用shell脚本将多行以模式开头的grep转换为单行

Question

What I'm trying to do is I would like to add multiple lines start with a pattern into a single line for example

test.txt contains

name: test1
role: manager
mail: test1@mail.com
name:test2
role: analyst
name:test3

I would like to grep start from "name" and end at "name" but not all "name" will end with "mail" some is without "mail"

desired output:

name: test1 role: manager mail: test1@mail.com
name:test2 role: analyst
name:test3 

Answer 1

Right tool for this is awk . I am not sure this could be done with grep

awk '{printf (/^name/?RS:FS)"%s",$0}' test.txt

name: test1 role: manager mail: test1@mail.com
name:test2 role: analyst
name:test3

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A gnu awk version (due to multiple characters in Record Separator)

awk 'NF{$1=$1;print RS,$0}' RS="name:" test.txt
name: test1 role: manager mail: test1@mail.com
name: test2 role: analyst
name: test3