如何使用tr(1)从非空行删除换行符('\n',0x0A)？

Question

我有一个名为file1的文件,其中包含以下内容:

The answer t
o your question 

A conclusive a
nswer isn’t al
ways possible.

When in doubt, ask pe
ople to cite their so
urces, or to explain

Even if we don’t agre
e with you, or tell y
ou.

我想将file1转换为file2.后者应如下所示:

The answer to your question

A conclusive answer isn’t always possible.

When in doubt, ask people to cite their sources, or to explain

Even if we don’t agree with you, or tell you.

如果我只是执行cat file1 | tr -d "\n" > file2",将删除所有换行符.何你只删除那些使用该实用程序在非空行上的换行符tr(1)？

Answer 1

perl -00 -lpe 'tr/\n//d'

-00是Perl的"段落"模式,用一个或多个空行作为分隔符读取输入.-l将系统换行符附加到print命令,因此删除输入中的所有换行符是安全的.