Korn Shell - question

[tekcheck]

Hey there,
I was just wondering how you could specify a range when reading a file in ksh?
Suppose I've got some data like so:

Name: Joe
Profession: Blah
Interests: Blah
<Other Text here>

Name: Dave
Profession: Blah
Interests: Blah
<Other Text here>

Now I'd like to read in the file and print out only the part on 'Joe'(the whole chunk - Name, Profession, etc), excluding Dave. Can this be done using grep/sed? I tried grep, but it only returns a single line. I know it can be done using awk, but is there some other way of going about it? Any suggestions?
Thanks for your time. Hope you have a safe and pleasant Easter.

 

[olded]

tekcheck:

This is one way:


nawk ' BEGIN { p=0 }
{
if($1 ~ /^Name:/ && $2 ~ /Joe/) # turn printing on
{ p=1 }

if($1 ~ /^Name:/ && $2 !~ /Joe/) # turn it off
{ p=0 }

if(p==1)
{ print $0 }

} ' < tmpfile

It's easier to process multi-line records, if you have a well-defined start and stop. Suppose you have a blank line after each mult-line record. You could do this:

nawk ' BEGIN { p=0 }
{
if($1 ~ /^Name:/ && $2 ~ /Joe/)
{ p=1 }

if($0 ~ /^$/)
{ p=0 }

if(p==1)
{ print $0 }

} ' < tmpfile

 

[tekcheck]

Thanks for the prompt reply, olded..appreciate it.
But can it be done without using nawk/awk..i.e. in pure ksh?

Thanks again.

 

[MikeLacey]

tekcheck,

As far as I know you will need to use some scripting language, awk or Perl or something, you could probably do it in sed (I say &quot;you&quot;, but I don't mean that *I* could do it in sed). Is there some reason you need to use the shell? Mike
&quot;Experience is the comb that Nature gives us after we are bald.&quot;

Is that a haiku?
I never could get the hang
of writing those things.

 

[gyan]

Hi Tekcheck,

You can do it(USING ONLY 'ksh')if you have FIXED NUMBER of fields for each entry (e.g., Name, profession, interest, phone, etc..).

Your entries go like this:

1
2
3
...
...
...

n Name: Joe
n+1 Profession: Blah
n+2 Interest: Blah
n+3
n+4
...
...
m Name: Joe
m+1 Profession: Blah
m+2 Interest: Blah
m+3
m+4
...
...

Use following steps:
--------------------

a) Use 'grep -n' to get the line # which matches your pattern (here Joe).

b) You might/ might not get multiple lines from the above command, depending on the occurance of the pattern.

c) Depending on the # of lines you are interested in (here 3 Name, Profession, Interest), use the following:

head -n filename | tail -1
head -n+1 filename | tail -1
head -n+2 filename | tail -1

This will print all the lines you are interested in.

Let me know if this answers your question.

Thanks,

Gyan

 

[bigoldbulldog]

To get the range of text between Joe and Dave, excluding Dave, try

sed '/Name: Joe/,/Name: Dave/' input | sed '$d'

If there is a blank (or unwanted non-blank) line before Dave and you want it gone then try the following to remove the last two lines

sed '/Name: Joe/,/Name: Dave/' input | sed 'N;$!P;$!D;$d'

Cheers,
ND

 

[aigles]

Hi,

To get all the informations for a specific name, with sed you can do :

NAME=Joe
sed -n -e '
/^Name: '$NAME'/,/^Name:/{
x
/ON/{
x
/Name/q
x
}
s/^.*$/ON/
x
p
} ' input-file


With pure Ksh, you can do :

NAME=Joe
Flag=
while read rec
do
case &quot;^$rec&quot; in
&quot;^Name: $NAME&quot;*)
Flag=ON
echo $rec
;;
&quot;^Name:&quot;*)
[ -b &quot;$Flag&quot; ] && break
;;
*)
[ -n &quot;$Flag&quot; ] && echo $rec
;;
esac
done < input-file Jean Pierre.