Re: escape characters in sed
Hans du Plooy wrote: william pursell wrote: Your version is missing the final ', so I'm guessing you meant: sed 's/\\)/ /' Yes, sorry, several mistakes on my part... which will replace occurences of \) with a single space Not what I had intended, I just wanted to replace ) with a space. Actually I wanted to replace the ( with a space and get rid of the trailing ), So, you'd want to use: sed -e 's/(/ /' -e 's/)//' Which says replace left parens with a space, right one with nothing, with a single run of 'sed'. : eg: $ echo '2nd backslash and first paren replaced: \\))' | sed 's/\\)/ /' 2nd backslash and first paren replaced: \ ) Note that this is exactly the same as: $ echo '2nd backslash and first paren replaced: \\))' | sed s/\)/\ / 2nd backslash and first paren replaced: \ ) Thanks, now I kinda understand why. Hans Bob smime.p7s Description: S/MIME Cryptographic Signature
Re: escape characters in sed
On Mon, May 14, 2007 at 08:59:49AM -0700, Bob McGowan wrote: Hans du Plooy wrote: william pursell wrote: Your version is missing the final ', so I'm guessing you meant: sed 's/\\)/ /' Yes, sorry, several mistakes on my part... which will replace occurences of \) with a single space Not what I had intended, I just wanted to replace ) with a space. Actually I wanted to replace the ( with a space and get rid of the trailing ), So, you'd want to use: sed -e 's/(/ /' -e 's/)//' any reason not to do sed -e 's/(/ /;s/)//' Which says replace left parens with a space, right one with nothing, with a single run of 'sed'. : eg: $ echo '2nd backslash and first paren replaced: \\))' | sed 's/\\)/ /' 2nd backslash and first paren replaced: \ ) Note that this is exactly the same as: $ echo '2nd backslash and first paren replaced: \\))' | sed s/\)/\ / 2nd backslash and first paren replaced: \ ) Thanks, now I kinda understand why. Hans Bob signature.asc Description: Digital signature
Re: escape characters in sed
Alex Samad wrote: On Mon, May 14, 2007 at 08:59:49AM -0700, Bob McGowan wrote: Hans du Plooy wrote: william pursell wrote: Your version is missing the final ', so I'm guessing you meant: sed 's/\\)/ /' Yes, sorry, several mistakes on my part... which will replace occurences of \) with a single space Not what I had intended, I just wanted to replace ) with a space. Actually I wanted to replace the ( with a space and get rid of the trailing ), So, you'd want to use: sed -e 's/(/ /' -e 's/)//' any reason not to do sed -e 's/(/ /;s/)//' ---XXX--- No, except perhaps clarity. And, the fact I was not aware that you could do it that way. ;) Bob smime.p7s Description: S/MIME Cryptographic Signature
escape characters in sed
Hi guys,
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
But it does nothing. Why? How do I do this?
Thanks
Hans
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Re: escape characters in sed
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Hash: SHA1
Hans du Plooy escribió:
Hi guys,
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
But it does nothing. Why? How do I do this?
Well, I think you're replacing `)' and not `('
Jose Luis.
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Re: escape characters in sed
Jose Luis Rivas Contreras wrote:
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Hans du Plooy escribió:
Hi guys,
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
But it does nothing. Why? How do I do this?
Well, I think you're replacing `)' and not `('
Typo, sorry. Should be:
sed 's/\\(/ /'
Still doesn't work though :-) I guess the question should be, how to
excape a ( character?
Thanks
Hans
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Re: escape characters in sed
Hi Hans.
Hans du Plooy, 13.05.2007 16:51:
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
No, just type the parenthesis, no escaping necessary.
Regards, Mathias
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Re: escape characters in sed
Hans du Plooy wrote:
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
But it does nothing. Why? How do I do this?
$ echo 1.2.3.4(1.2.3.4) | sed 's/(/ /'
1.2.3.4 1.2.3.4)
$ echo 1.2.3.4(1.2.3.4) | sed s/\(/\ /
1.2.3.4 1.2.3.4)
Your version is missing the final ', so I'm guessing you
meant: sed 's/\\)/ /' which will replace occurences
of \) with a single space: eg:
$ echo '2nd backslash and first paren replaced: \\))' | sed 's/\\)/ /'
2nd backslash and first paren replaced: \ )
Note that this is exactly the same as:
$ echo '2nd backslash and first paren replaced: \\))' | sed s/\)/\ /
2nd backslash and first paren replaced: \ )
Try the exercise of replacing the quote marks in the echo with
double-quotes. Hours of fun for the whole family!
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Re: escape characters in sed
Hans du Plooy wrote:
Typo, sorry. Should be:
sed 's/\\(/ /'
Still doesn't work though :-) I guess the question should be, how to
excape a ( character?
With a backslash! The thing is, if you include the single quotes,
you don't need to escape it through the shell, but if you drop
the single quotes, you do. Also, since you are escaping the backslash
to sed, you are telling sed to look for a literal backslash. When sed
sees an unescaped (, it looks for it literally. When it sees an escaped
(, it uses it as a grouping symbol. In other words: the shell and
sed both treat backslash as a special character, but only the shell
treats ( as a special character.
Suppose you want to replace the literal text a (fat) cat
with a cat:
$ echo a (fat) cat | sed 's/(fat) //'
a cat
However, this replaces all occurences of (fat) , which may not
be what you want, so you do a grouping:
$ echo a (fat) cat | sed 's/\(a\) (fat) \(cat\)/\1 \2/'
a cat
Here, we use '(' to match literal '(', and '\(' to tell
sed that we want to remember that portion of the regex,
for use in the replacement string.
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Re: escape characters in sed
Mathias Brodala wrote:
Hi Hans.
Hans du Plooy, 13.05.2007 16:51:
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
No, just type the parenthesis, no escaping necessary.
Thanks Mathias - guess I was trying to be too smart :-)
Hans
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Re: escape characters in sed
william pursell wrote: Your version is missing the final ', so I'm guessing you meant: sed 's/\\)/ /' Yes, sorry, several mistakes on my part... which will replace occurences of \) with a single space Not what I had intended, I just wanted to replace ) with a space. Actually I wanted to replace the ( with a space and get rid of the trailing ), : eg: $ echo '2nd backslash and first paren replaced: \\))' | sed 's/\\)/ /' 2nd backslash and first paren replaced: \ ) Note that this is exactly the same as: $ echo '2nd backslash and first paren replaced: \\))' | sed s/\)/\ / 2nd backslash and first paren replaced: \ ) Thanks, now I kinda understand why. Hans -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: escape characters in sed
Hans du Plooy wrote:
Jose Luis Rivas Contreras wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hans du Plooy escribió:
Hi guys,
I'm trying to do a search/replace on some text. Looks like this:
1.2.3.4(1.2.3.4)
To my mind, this should replace the '(' with a space
sed 's/\\)/ /
But it does nothing. Why? How do I do this?
Well, I think you're replacing `)' and not `('
Typo, sorry. Should be:
sed 's/\\(/ /'
Still doesn't work though :-) I guess the question should be, how to
excape a ( character?
Thanks
Hans
I think you have too many \, try
sed 's/\(/ /'
That is the way it would be done in perl, vim, etc.
but sed may be different! ;-)
Good Luck!
Dennis
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