something unclear with sed for me
I want to replaces all multiple spaces with one space. My first attempt was this: sed -e 's/\ */\ /g' This replaced all multiple spaces with one but as a side effect, sed inserted a space between all characters. Playing a little I tried this: sed -e 's/[\ ]\ */\ /g' and this works. The fact is that I don't understand why the first one doesn't work. Can someone explain me that?
Re: something unclear with sed for me
On Wed, May 11, 2005 at 03:01:47PM +0300, Andras Lorincz wrote: I want to replaces all multiple spaces with one space. My first attempt was this: sed -e 's/\ */\ /g' The asterisk means zero or more, so it matches evven if there are no spaces. This replaced all multiple spaces with one but as a side effect, sed inserted a space between all characters. Playing a little I tried this: sed -e 's/[\ ]\ */\ /g' and this works. The fact is that I don't understand why the first one doesn't work. Can someone explain me that? -- David Jardine Running Debian GNU/Linux and loving every minute of it. -L. von Sacher-M.(1835-1895) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
RE: something unclear with sed for me
From: Andras Lorincz [mailto:[EMAIL PROTECTED] I want to replaces all multiple spaces with one space. My first attempt was this: sed -e 's/\ */\ /g' This replaced all multiple spaces with one but as a side effect, sed inserted a space between all characters. Playing a little I tried this: sed -e 's/[\ ]\ */\ /g' and this works. The fact is that I don't understand why the first one doesn't work. Can someone explain me that? You can use + that means one or more of the preceding character. But + is defined in extended regular expression. use -r option for the extended regular expression like this: sed -r 's/ +/ /g' -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: something unclear with sed for me
Andras Lorincz wrote: I want to replaces all multiple spaces with one space. My first attempt was this: sed -e 's/\ */\ /g' This replaced all multiple spaces with one but as a side effect, sed inserted a space between all characters. Playing a little I tried this: sed -e 's/[\ ]\ */\ /g' and this works. The fact is that I don't understand why the first one doesn't work. Can someone explain me that? I dont know about sed. But you can do this with the tr command. tr -s ' ' is what you are after. For more details see man tr. raju -- Graduate student MAE, Cornell University -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: something unclear with sed for me
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Andras Lorincz wrote: I want to replaces all multiple spaces with one space. My first attempt was this: sed -e 's/\ */\ /g' This replaced all multiple spaces with one but as a side effect, sed inserted a space between all characters. You told sed replace 0 or more whitespace characters with 1 whitespace character. sed -e 's/[\ ]\ */\ /g' and this works. The fact is that I don't understand why the first one doesn't work. Can someone explain me that? This time you told sed replace 1 or more whitespace characters with 1 whitespace character. - -- /phil -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.0 (MingW32) Comment: Public Key: http://www.dyermaker.org/gpgkey iD8DBQFCgkw/Gbd/rBLcaFwRAtUqAKCu8C+iNH53011Lq3NGX680H/P4xwCdGUBZ e78WXTGi3RGpm3uoGFBv04I= =ZkNQ -END PGP SIGNATURE- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
