Thanks folks,
I was able to accomplish the task without using the loop. I did attempt the
---sed "${a}q;d" "$filename"---
though and it worked great. I'll know that in the future.
Thanks for the help,
Keith
On 7/21/05, Eben King <eben1@tampabay.rr.com> wrote:
> #include <std_disclaimer.h>
>
> On Thu, 21 Jul 2005, Keith Lelacheur wrote:
>
> > I have a script to move through each line of a file and do some parsing
> > with a combiantion of sed and awk. I am having trouble passing a variable
> > into the address portion of the sed command though. The basic outline is:
> >
> >
> > ____________________________
> > #!/bin/bash
> > filename=$1
> > filelines=`wc-l $filename`
>
> My wc acts like so:
>
> [eben@pc tmp]$ foo=`wc -l watch-receipt.htm`
> [eben@pc tmp]$ echo "$foo"
> 216 watch-receipt.htm
>
> Something like this might work:
>
> [eben@pc tmp]$ foo=`wc -l < watch-receipt.htm`
> [eben@pc tmp]$ echo "$foo"
> 216
>
> > for ((a=1; a <= filelines ; a++))
> > do
> > sed '$aq;d' $filename
> > blah,
> > blah,
> > blah,
> > done
> > _____________________________
> >
> >
> > the problem with the -- sed '$aq;d' $filename -- syntax is that it
> > process evey line of the file not the line number specified by the
> > loop counter.
>
> $a is in single quotes. Variables aren't expanded there -- what sed gets is
> not
>
> 1q;d somefile
> 2q;d somefile
> 3q;d somefile
> ...
>
> but
>
> $aq;d somefile
> $aq;d somefile
> $aq;d somefile
> ...
>
> ; isn't parsed when in double quotes (but is when not), and it's
> conceiveable that you'd try to use a filename with #, ;, space and so on,
> and $aq will be expanded to whatever happens to be in "aq" (or nothing if
> that's the case), so replacing that line with
>
> sed "${a}q;d" "$filename"
>
> should work. Also, comp.unix.shell is great.
>
> --
> "Never go off on tangents, which are lines that intersect a curve at only
> one point and were discovered by Euclid, who lived in the 6th century,
> which was an era dominated by the Goths, who lived in what we now know
> as Poland." - Unknown from Nov. 1998 issue of Infosystems Executive.
>
>
>
>
>
>
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