Date: Thu, 18 Jun 2009 00:00:22 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: chloe K <chloekcy2000@yahoo.ca> Cc: freebsd-questions@freebsd.org Subject: Re: sed help Message-ID: <873a9yshi1.fsf@kobe.laptop> In-Reply-To: <974960.33077.qm@web57412.mail.re1.yahoo.com> (chloe K.'s message of "Wed, 17 Jun 2009 10:55:28 -0700 (PDT)") References: <974960.33077.qm@web57412.mail.re1.yahoo.com>
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On Wed, 17 Jun 2009 10:55:28 -0700 (PDT), chloe K <chloekcy2000@yahoo.ca> w=
rote:
> Hi
> I have a file. list.txt (two columns)
> =A0
> column1=A0=A0=A0 column2
> name=A0=A0=A0=A0=A0=A0=A0 address
> =A0
> I need to put in the letter file letter.txt eg:
> =A0
> Dear: Chloe
> Address: CA
> =A0
> Can I use this
> =A0
> 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 keramida@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 keramida@ceid.upatras.gr | \
awk '{print "Dear: ", $1; print "Address:", $2}'
Dear: giorgos
Address: keramida@ceid.upatras.gr
A single line of awk is vastly more readable than the equivalent sed
expression in this case.
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