打印只是awk的某些列 [英] Print just some columns in awk

问题描述

我想知道如何过滤要从一个txt文件编程语言的只是名字。
我已经使用在AWK下面这句话，但我不能得到我想要的：

I was wondering how to filter just the name of the programming language from a txt file. I have used the following sentence in AWK but I cannot get what I want:

($1 ~ /[A-Za-z]*/)  && ( ($3 ~ /-/) || ($4 ~ /-/) )

怎么做任何想法？因为你可以看到，有没有正规途径的行写的。

Any ideas of how to do it? Cause as you can see, there is no regular way the lines are written.

在换句话说，我有以下行，但我只是想打印只是编程语言的名称

In other words, I have the following lines but I just want to print just the programming language name

2.PAK - AI language with coroutines.  "The 2.PAK Language: Goals and
Description", L.F. Melli, Proc IJCAI 1975.

473L Query - English-like query language for Air Force 473L system.  Sammet
1969, p.665.  "Headquarters USAF Command and Control System Query
Language", Info Sys Sci, Proc 2nd Congress, Spartan Books 1965, pp.57-76.

3-LISP - Brian Smith.  A procedurally reflective dialect of LISP which uses
an infinite tower of interpreters. 

我只想过滤，使出现下列行：

I just want to filter and make the following lines appear:

2.PAK

473L Query 

3-LISP

编辑：现在会为同一句子工作以下

DML - 

  1. Data Management Language.  Early ALGOL-like language with lists,
graphics, on Honeywell 635.  

  2. "DML: A Meta-language and System for the Generation of Practical and
Efficient Compilers from Denotational Specifications"

我想我只需要解决一些RS和FS的东西，所以我能得到​​这个行？

I guess I just have to fix some of the RS and FS stuff so I can get this line?

DML

在此先感谢！

推荐答案

它看起来像 - 可能是一个很好的分离，给出的文件：

It looks like " - " could be a good separator, given the file:

$ cat /tmp/a 
2.PAK - AI language with coroutines.  "The 2.PAK Language: Goals and
Description", L.F. Melli, Proc IJCAI 1975.

473L Query - English-like query language for Air Force 473L system.  Sammet
1969, p.665.  "Headquarters USAF Command and Control System Query
Language", Info Sys Sci, Proc 2nd Congress, Spartan Books 1965, pp.57-76.

3-LISP - Brian Smith.  A procedurally reflective dialect of LISP which uses
an infinite tower of interpreters. 

您可以使用以下内容：

$ awk -F ' - ' '/ - /{ print $1 }' /tmp/a
2.PAK
473L Query
3-LISP
$ 

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