Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

This thread has no sed solution yet?

The following program reads a single line, and gives its words in reverse.

sed 's/^/@/;:;s/\(.*@\)[ \t]*\([^ \t][^ \t]*\)/\2 \1/;t;s/ *@.*//;q'

(This works in GNU sed. If you use another sed, you may need to change the semicolons to new lines, and the \t escapes to real tab characters.)

This really breaks if the input contains an at-sign. If you need such inputs, change the at-sign to some other character that doesn't occurr in the input, or use the following more complicated snippet.

sed 's/@/@a/g;s/^/@s/;:;s/\(.*@s\)[ \t]*\([^ \t][^ \t]*\)/\2 \1/;t;s/ +*@s.*//;s/@a/@/g;q'

In reply to Re: Five Ways to Reverse a String of Words (C#, Perl 5, Perl 6, Ruby, Haskell) by ambrus
in thread Five Ways to Reverse a String of Words (C#, Perl 5, Perl 6, Ruby, Haskell) by eyepopslikeamosquito

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others scrutinizing the Monastery: (4)
As of 2024-03-28 15:24 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found