Shell Programming and Scripting

how to replace grep with awk commands.
i have a code like:

Code:

grep -w $student $markfile|$subjectid

can similar code be written by replacing grep with awk.

Thanks in advance,
regards,
giri

What are you trying to accomplish??

Hi,
Welcome to unix.com!!!
Try this one,

Code:

awk -v w="${student}" '$0~w{print;}' ${markfile}

If you want to use bash variable inside awk, you have to use -v option or assign it before specify file.
Cheers,
Ranga:-)

Thanks Ranga,
while searching on the above query..I was able to find a solution..but with limitted success.

Code:

studentMarkInParticularSubject=`awk -F: '/$student/ ' $markfile | awk -F: '/$subjectid/ '`

I was getting results when i ran the code in the command prompt with value substituted
ie

Code:

studentMarkInParticularSubject=`awk -F: '/20/ ' classmark | awk -F: '/ENG/ '`

Code:

studentMarkInParticularSubject=`awk -F: '/$student/ ' $markfile | awk -F: '/$subjectid/ '`

Kindly , help me with this.
Thanks & Regards,
Giri

Advice for forum posts, general:

To obtain the best answers quickly for processing datasets --
extracting, transforming, filtering, you should, after having
searched for answers (man pages, Google, etc.):

1. Post representative samples of your data (i.e. data that
should "succeed" and data that should "fail")

2. Post what you expect the results to be, in addition to
describing them. Be clear about how the results are to be
obtained, e.g. "add field 2 from file1 to field 3 from file2",
"delete all lines that contain 'possum', etc.

3. Post what you have attempted to do so far. Post scripts,
programs, etc. within CODE tags. If you have a specific
question about an error, please post the shortest example of the
code, script, etc. that exhibits the problem.

4. Place the data and expected output within CODE tags, so that
they are more easily readable.

Special cases, exceptions, etc., are very important to include
in the samples.

Try like this:

Code:

studentMarkInParticularSubject=`awk -F: '/'"$student"'/' $markfile | awk -F: '/'"$subjectid"'/'`

or like this:

Code:

studentMarkInParticularSubject=`awk -F: '$0 ~ '"$student" $markfile | awk -F: '$0 ~ '"$subjectid"`

Nevertheless, the 2 awk commands can be combined together. But that depends on your requirement.

Thanks elixir_sinari,
The solution was working when i tried in my script.
Thanks a lot for your time and efforts.

regards,
Giri

---------- Post updated at 09:13 PM ---------- Previous update was at 09:11 PM ----------

Thanks elixir_sinari,
The solution was working when i tried in my script.
Thanks a lot for your time and efforts.

regards,
giri