Re: sed help
On Wed, 17 Jun 2009 10:55:28 -0700 (PDT), chloe K wrote:
> Hi
> I have a file. list.txt (two columns)
>
> column1 column2
> name address
>
> I need to put in the letter file letter.txt eg:
>
> Dear: Chloe
> Address: CA
>
> Can I use this
>
> for i `cat list.txt` | sed 's/Chloe/$i.1; /CA/$i.2/g' $i.letter.txt
No that won't work. sed does 'stream editing' to its own input file, so
you have to redirect each output for *every* loop iteration. But I
don't think this is a good method of solving this problem, because you
only have one input file and one output file.
See what the following does, to give you can idea:
$ echo giorgos keram...@ceid.upatras.gr | sed -e 's/^\([^ ]*\)[ ]*\(.*\)$/\
Dear:\1\
Address: \2\
/'
NOTE: If you really want to work effectively with sed, please take a bit
of time to read the manpage of sed(1) and ed(1), paying careful to the
parts about: (1) regular expressions, (2) character classes, and (3) the
rules of character quoting.
It's also worth noting that you don't _have_ to use sed for this
specific problem, because there are other tools more suitable for
processing data in columns, i.e. awk(1):
$ echo giorgos keram...@ceid.upatras.gr | \
awk '{print "Dear: ", $1; print "Address:", $2}'
Dear:giorgos
Address: keram...@ceid.upatras.gr
A single line of awk is vastly more readable than the equivalent sed
expression in this case.
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Re: sed help
In the last episode (Jun 17), chloe K said: > I have a file. list.txt (two columns) > > column1 column2 > name address > > I need to put in the letter file letter.txt eg: > > Dear: Chloe > Address: CA > > Can I use this > > for i `cat list.txt` | sed 's/Chloe/$i.1; /CA/$i.2/g' $i.letter.txt Try: cat list.txt | while read name address ; do sed -e "s/Chloe/$name/ ; s/CA/$address/" < letter.txt > letter.$name.txt done You need the "while read" part so that you loop once per line. Your code would have looped once per word in the input file. You also need double-quotes on your sed line because $variable expansion isn't done inside single-quotes. If your names have spaces in them, consider swapping the name and address in your input file, since "read" splits on spaces and assigns the remainder of the line to the last variable listed. -- Dan Nelson dnel...@allantgroup.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: Sed Help.....
On Thu, Nov 11, 2004 at 08:12:55AM +0200, Giorgos Keramidas wrote:
> On 2004-11-10 15:15, Rod Person <[EMAIL PROTECTED]> wrote:
> > On Wednesday 10 November 2004 7:58 pm, mailing lists at MacTutor wrote:
> > > Take a look at what the shell replacement is actually doing. If you
> > > were to write the line manually it would look like this:
> > >
> > > sed -e 's/\/usr\X11R6\/bin\/xdm/\/usr\/local\/bin\/kdm/g' ...
> > >
> > > Right?
> > >
> > > But the shell doesn't escape the path separators (slashes). You need to
> > > escape them yourself in the variable assignments. Like this,
> > >
> > > KDMLINE='\/usr\/local\/bin\/kdm'
> > > &c
> >
> > I hate when you look at something for hours and it something you know you
> > should have known! I had at one point had the variables with double qoute
> > and
> > even tried to escape the qoutes!!
I'd recommend using the : because it's the least likely character to
appear in a filename since : is the seperator used in $PATH. But then
again, who would use a | in a filename!?
>
> You can also use different sed-separator characters:
>
> sed -e "s|${REPLACELINE}|${KDMLINE}|"
>
> The choise of '|' is arbitrary above. It could have been '@', '#', or
> '!', for all that sed(1) cares. The substitution would still work.
>
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Re: Sed Help.....
On 2004-11-10 15:15, Rod Person <[EMAIL PROTECTED]> wrote:
> On Wednesday 10 November 2004 7:58 pm, mailing lists at MacTutor wrote:
> > Take a look at what the shell replacement is actually doing. If you
> > were to write the line manually it would look like this:
> >
> > sed -e 's/\/usr\X11R6\/bin\/xdm/\/usr\/local\/bin\/kdm/g' ...
> >
> > Right?
> >
> > But the shell doesn't escape the path separators (slashes). You need to
> > escape them yourself in the variable assignments. Like this,
> >
> > KDMLINE='\/usr\/local\/bin\/kdm'
> > &c
>
> I hate when you look at something for hours and it something you know you
> should have known! I had at one point had the variables with double qoute and
> even tried to escape the qoutes!!
You can also use different sed-separator characters:
sed -e "s|${REPLACELINE}|${KDMLINE}|"
The choise of '|' is arbitrary above. It could have been '@', '#', or
'!', for all that sed(1) cares. The substitution would still work.
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Re: Sed Help.....
On Thu, 11 Nov 2004, Svein Halvor Halvorsen wrote: > > [Rod Person, 2004-11-10] > > Here is the relavent code: > > > > KDMLINE="/usr/local/bin/kdm -nodaemon" > > REPLACELINE="/usr/X11R6/bin/xdm -nodaemon" > > > > sed -e "s/$REPLACELINE/$KDMLINE/g" /etc/test/ttys > /etc/test/new > > > > Here is the error I'm getting: > > sed: 1: "s//usr/X11R6/bin/xdm -n ...": bad flag in substitute command: > > 'X' > > > > > I was just made aware of a really nice feature of sed just yesterday: > > You can replace the / as a seperator with whatever character you want, as > long as you use that same character all the way!! > > This is really nice, since you wouldn't need to escape the / characters as > you otherwise would need to do. Works this way with just about any system using the sed substitution syntax (for instance, vi uses it, vim does). Go looking at nearly any large Gmake script (sucu as one of the makefiles from gcc) and you'll see it all over the place. > > Just do like this (for instance): > > sed -2 s_$REPLACELINE_$KDMLIME_g /etc/test/ttys > /etc/test/new > ___ > [EMAIL PROTECTED] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "[EMAIL PROTECTED]" > Chuck Robey | Interests include C & Java programming, FreeBSD, [EMAIL PROTECTED] | electronics, communications, and SF/Fantasy. New Year's Resolution: I will not sphroxify gullible people into looking up fictitious words in the dictionary (on the wall at my old fraternity, Signa Phi Nothing). ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Sed Help.....
[Rod Person, 2004-11-10] > Here is the relavent code: > > KDMLINE="/usr/local/bin/kdm -nodaemon" > REPLACELINE="/usr/X11R6/bin/xdm -nodaemon" > > sed -e "s/$REPLACELINE/$KDMLINE/g" /etc/test/ttys > /etc/test/new > > Here is the error I'm getting: > sed: 1: "s//usr/X11R6/bin/xdm -n ...": bad flag in substitute command: > 'X' > I was just made aware of a really nice feature of sed just yesterday: You can replace the / as a seperator with whatever character you want, as long as you use that same character all the way!! This is really nice, since you wouldn't need to escape the / characters as you otherwise would need to do. Just do like this (for instance): sed -2 s_$REPLACELINE_$KDMLIME_g /etc/test/ttys > /etc/test/new ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Sed Help.....
On Wed, Nov 10, 2004 at 02:43:01PM +, Rod Person wrote: > > KDMLINE="/usr/local/bin/kdm -nodaemon" > REPLACELINE="/usr/X11R6/bin/xdm -nodaemon" > > sed -e "s/$REPLACELINE/$KDMLINE/g" /etc/test/ttys > /etc/test/new > > Here is the error I'm getting: > sed: 1: "s//usr/X11R6/bin/xdm -n ...": bad flag in substitute command: 'X' ^^^ my guess is: after expanding $REPLACELINE your command looks like you see above, which is not what you wanted. proposed solution: use other delimiters for sed. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Sed Help.....
On Wednesday 10 November 2004 7:58 pm, mailing lists at MacTutor wrote: > Rod, > > Take a look at what the shell replacement is actually doing. If you > were to write the line manually it would look like this: > > sed -e 's/\/usr\X11R6\/bin\/xdm/\/usr\/local\/bin\/kdm/g' ... > > Right? > > But the shell doesn't escape the path separators (slashes). You need to > escape them yourself in the variable assignments. Like this, > > KDMLINE='\/usr\/local\/bin\/kdm' > &c > > And if there is only one occurrence per line, then you don't need the > 'g' modifier. > > Hope that helps. > > Alex Thanks Alex and Miguel... I hate when you look at something for hours and it something you know you should have known! I had at one point had the variables with double qoute and even tried to escape the qoutes!! Thanks again Rod... ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: Sed Help.....
On Wed, 10 Nov 2004 14:43:01 + Rod Person <[EMAIL PROTECTED]> wrote: Hi, > KDMLINE="/usr/local/bin/kdm -nodaemon" > REPLACELINE="/usr/X11R6/bin/xdm -nodaemon" > > sed -e "s/$REPLACELINE/$KDMLINE/g" /etc/test/ttys > /etc/test/new > > Here is the error I'm getting: > sed: 1: "s//usr/X11R6/bin/xdm -n ...": bad flag in substitute > command: 'X' > Both strings contain /, so you have to either escape it "\/" or use different command separator, e.g. '[EMAIL PROTECTED]@[EMAIL PROTECTED]' Cheers, -- Miguel Mendez <[EMAIL PROTECTED]> | Extreme ways are back again http://www.energyhq.es.eu.org| Extreme places I didn't know PGP Key: 0xDC8514F1 | I broke everything new again Note: All HTML mail goes to /dev/null| Everything that I'd owned pgpfuuM5YtCZw.pgp Description: PGP signature
Re: Sed Help.....
Rod, Take a look at what the shell replacement is actually doing. If you were to write the line manually it would look like this: sed -e 's/\/usr\X11R6\/bin\/xdm/\/usr\/local\/bin\/kdm/g' ... Right? But the shell doesn't escape the path separators (slashes). You need to escape them yourself in the variable assignments. Like this, KDMLINE='\/usr\/local\/bin\/kdm' &c And if there is only one occurrence per line, then you don't need the 'g' modifier. Hope that helps. Alex On Nov 10, 2004, at 9:43 AM, Rod Person wrote: I trying to write a script that will make it easier for a friend that I finally talked into trying Freebsd setup a desktop. This part of the script is suppose to change the line in the ttys file to allow kdm to start on boot. Here is the relavent code: KDMLINE="/usr/local/bin/kdm -nodaemon" REPLACELINE="/usr/X11R6/bin/xdm -nodaemon" sed -e "s/$REPLACELINE/$KDMLINE/g" /etc/test/ttys > /etc/test/new Here is the error I'm getting: sed: 1: "s//usr/X11R6/bin/xdm -n ...": bad flag in substitute command: 'X' I can't seem to figure this out and the only things I've found in searching is that sed had a problem with replacing strings over 4096 bytes, but I don't think this is the cause and all those post were years old. This is on FreeBSD 5.3. Rod ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]" - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Alexander Sendzimir (owner)802 863 5502 MacTutor: Apple Mac OS X Consulting [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
