Shell Programming and Scripting

I need shell script for the following specfic need, I'll get following output after running my program.
I wanted every 50th row in the coloumn and take into array.

For example input

Code:

==============
03
03
03
03
05
05
05
05
07
07
07
07

I wanted to extract 3,5,7 and store it in array. extract the array if i want to use the array again.

out ---->

Code:

3,5,7

please suggest a way to cut the specified row and store it in array.

Is this a homework assignment?

I'm completely confused about what you are trying to do. You have shown us a file that contains 12 or 13 lines (I had to guess when I added CODE tags for you whether or not the line containing the equal signs is part of your input file). Then you say that you want every 50th row (of which there are none). And then you say you want 3, 5, and 7 (none of which appear in your input file). And you say you want those values stored in an array. What kind of array (shell, awk, ???)?

What OS are you using?

What shell are you using?

What language are you using?

What have you tried?

Sorry for not mention clearly. I say it is example which i wrote here.
I need shell script to extract 3,5,7 which are in every 4th row for the below example.
==============

Code:

03
03
03
03
05
05
05
05
07
07
07
07

I am using Linux bash shell.. I don't know array concept in shell scripting i just know basics of shell programming.
I tried using

Code:

cut -f 1,4

and

Code:

cut -f 1,8

but it doesn't get the exact location.

---------- Post updated at 02:36 PM ---------- Previous update was at 02:06 PM ----------

Sorry for not mention clearly. I say it is example which i wrote here.
I need shell script to extract 3,5,7 which are in every 4th row for the below example.
==============

Code:

03
03
03
03
05
05
05
05
07
07
07
07

I am using Linux bash shell.. I don't know array concept in shell scripting i just know basics of shell programming.
I tried using

Code:

cut -f 1,4

and

Code:

cut -f 1,8

but it doesn't get the exact location and also i wanted to store it in array after extracting it.

Moderator's Comments:

Please use CODE tags!

Show us clearly (with CODE tags) what is actually in your input file.

Show us exactly (with CODE tags) what you are trying to extract from that input file.

How would using cut to extract the first and 4th (or first and eighth) tab delimited fields from lines that contain only one field (and no tabs) help you extract every fourth line from a file.

If you don't understand the concept of an array in shell scripting, why do you want an array in your shell script? What are you going to do with that array?

I repeat 3, 5, and 7 do not appear in any row in your file. Your file contains 03, 05, and 07, respectively. What transformation are you trying to perform? Are you trying to convert octal input to decimal values? Are you trying to strip leading zeros from leading zero-filled decimal values?

I repeat: IS THIS A HOMEWORK ASSIGNMENT?

No this is not home work assignment. I had some requirement to restart some of the killed process. my program generate some files(like /tmp/grepd.0003.00049:12:server_read_cb:xxld died) when some process died. So based on the input from the file i have to extract these numbers and manipulate to restart those processes.

Code:

grep -rn "died" /tmp/grepd.0*|cut -d':' -f1|cut -d'.' -f2|cut -c 3,4

out File contains following after executing above code
=======

Code:

03
03
03
03
05
05
05
05
07
07
07
07

======

so from above out file, i want to extract 03,05,04,07 which is on every fourth row and convert to decimal value, store it in an array.

Moderator's Comments:

Please use CODE tags for sample input, sample output, and code as directed in private mail you received shortly after you posted the 1st message in this thread.

defining array is like below

set -A array_name value1 value2 ... valuen

get the uniq contents with

Code:

sort -u

and put a loop over the uniq contents and write into array. job done!!

How about (assuming you are using bash which you failed to mention)

Code:

ARR=($(awk '/died/ {T[$2]} END {for (i in T) print i+0}' FS="." file))