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chomp behaviour

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  chomp behaviour Steel Steel <angel_steel@ymail.com> - 2011-04-15 21:08 -0500
    Re: chomp behaviour James <oscartheduck@gmail.com> - 2011-04-15 21:15 -0500
    Re: chomp behaviour Roy Zuo <roylzuo@gmail.com> - 2011-04-15 21:19 -0500
    Re: chomp behaviour Peter Zotov <whitequark@whitequark.org> - 2011-04-15 21:21 -0500
    Re: chomp behaviour Mike Stok <mike@stok.ca> - 2011-04-15 21:23 -0500

#2984 — chomp behaviour

Using 1.9.1
I noticed something with chomp

$ echo "abc" | ruby -e 'puts gets.chomp("c")'
abc

$ irb
irb(main):001:0> "abc".chomp("c")
=> "ab"

It doesn't work on the command line, or am i doing it wrong.?
comments?

-- 
Posted via http://www.ruby-forum.com/.

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#2985

[Note:  parts of this message were removed to make it a legal post.]

What are you trying to accomplish? Bear in mind that, on the command line,
you have bash or cmd intercepting everything. It's not the same as trying
things inside irb.


Look up what string.chomp(arg) does in irb  vs the same thing on the command
line.

On Fri, Apr 15, 2011 at 8:08 PM, Steel Steel <angel_steel@ymail.com> wrote:

> Using 1.9.1
> I noticed something with chomp
>
> $ echo "abc" | ruby -e 'puts gets.chomp("c")'
> abc
>
> $ irb
> irb(main):001:0> "abc".chomp("c")
> => "ab"
>
> It doesn't work on the command line, or am i doing it wrong.?
> comments?
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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#2986

``echo "abc"`` outputs "abc\n", try this instead

    echo -n abc | ruby -e "puts gets.chomp 'c'"

Roy

On Sat, Apr 16, 2011 at 11:08:10AM +0900, Steel Steel wrote:
> Using 1.9.1
> I noticed something with chomp
> 
> $ echo "abc" | ruby -e 'puts gets.chomp("c")'
> abc
> 
> $ irb
> irb(main):001:0> "abc".chomp("c")
> => "ab"
> 
> It doesn't work on the command line, or am i doing it wrong.?
> comments?
> 
> -- 
> Posted via http://www.ruby-forum.com/.
> 

-- 
 ___________________________________________________________________ 
/ She's the kind of girl who climbed the ladder of success wrong by \
| wrong.                                                            |
|                                                                   |
\ -- Mae West                                                       /
 ------------------------------------------------------------------- 
       \   ,__,
        \  (oo)____
           (__)    )\
              ||--|| *

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#2987

 On Sat, 16 Apr 2011 11:08:10 +0900, Steel Steel wrote:
> Using 1.9.1
> I noticed something with chomp
>
> $ echo "abc" | ruby -e 'puts gets.chomp("c")'
> abc
>
> $ irb
> irb(main):001:0> "abc".chomp("c")
> => "ab"
>
> It doesn't work on the command line, or am i doing it wrong.?
> comments?

 "gets" returns the whole read string, with trailing newline ("\n").
 Try: echo "abc" | ruby -e 'p gets' # => "abc\n"

 You can either chomp it twice, or do "echo -n" instead of "echo"
 (the former does not add a newline), or use "strip" method, which
 removes all whitespace from begin and end of a string (check also
 "rstrip" and "lstrip" functions).

-- 
   WBR, Peter Zotov.

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#2988

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On 2011-04-15, at 10:08 PM, Steel Steel wrote:

> Using 1.9.1
> I noticed something with chomp
> 
> $ echo "abc" | ruby -e 'puts gets.chomp("c")'
> abc
> 
> $ irb
> irb(main):001:0> "abc".chomp("c")
> => "ab"
> 
> It doesn't work on the command line, or am i doing it wrong.?
> comments?

gets includes the new line (if present):

ratdog:~ mike$ echo "abc" | ruby -e 'puts gets.chomp("c")'
abc
ratdog:~ mike$ echo -n "abc" | ruby -e 'puts gets.chomp("c")'
ab

Hope this helps,

Mike


- -- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.




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