Styjun

I have a file consisting of 4000 rows, I need to iterate the records of that file over shell script and extract first 10 rows and send that rows to my java code which i already wrote, and then next 10 rows and so on

To pass 10 lines at a time as arguments to your script:

< file xargs -d$'n' -n 10 myscript

To pipe 10 lines at a time as input to your script:

< file xargs -d$'n' -n 10 sh -c 'printf "%sn" "$@" | myscript' 

Assuming your input is in a file named file which I'm creating with 30 instead of 4000 lines of input:

$ seq 30 > file

and modifying to have some lines that contain spaces, some that contain shell variables, and some that contain regexp and globbing chars to show no type of shell expansion is being done:

$ head -10 file
1
here is a multi-field line
3
4
$HOME
6
.*
8
9
10

Here's 10 args at a time being passed to an awk script:

$ < file xargs -d$'n' -n 10 awk 'BEGINfor (i=1; i<ARGC; i++) print i, "<" ARGV[i] ">"; exit ENDprint "---"'
1 <1>
2 <here is a multi-field line>
3 <3>
4 <4>
5 <$HOME>
6 <6>
7 <.*>
8 <8>
9 <9>
10 <10>
---
1 <11>
2 <12>
3 <13>
4 <14>
5 <15>
6 <16>
7 <17>
8 <18>
9 <19>
10 <20>
---
1 <21>
2 <22>
3 <23>
4 <24>
5 <25>
6 <26>
7 <27>
8 <28>
9 <29>
10 <30>
---

and here's 10 lines of input at a time being passed to an awk script:

$ < file xargs -d$'n' -n 10 sh -c 'printf "%sn" "$@" | awk '''print NR, "<" $0 ">" ENDprint "---"'''' 
1 <1>
2 <here is a multi-field line>
3 <3>
4 <4>
5 <$HOME>
6 <6>
7 <.*>
8 <8>
9 <9>
10 <10>
---
1 <11>
2 <12>
3 <13>
4 <14>
5 <15>
6 <16>
7 <17>
8 <18>
9 <19>
10 <20>
---
1 <21>
2 <22>
3 <23>
4 <24>
5 <25>
6 <26>
7 <27>
8 <28>
9 <29>
10 <30>
---

Considering that OP wants to pass lines as an argument to OP's code if that is the case then could you please try following once(haven't tested it by running it since I don't have OP's java code etc).

awk '
FNR%10==0
 system("your_java_code " value OFS $0)
 value=""


 value=(value?value OFS:"")$0

END
 if(value)
 system("your_java_code " value)
 

' Input_file

OR

awk '

 value=(value?value OFS:"")$0

FNR%10==0
 system("your_java_code " value)
 value=""

END
 if(value)
 system("your_java_code " value)
 

' Input_file

PS: Just for safer side, I kept END section of awk code so that in case there are left over lines(let's say total number of lines are NOT completely divided by 10) then it will call java program with remaining lines to it.

Sounds to me like you want to slice out rows from a file, then pipe those rows to java. This interpretation differs from the other answers, so let me know if I'm not understanding you:

$ file=/etc/services
$ count=$(wc -l < "$file")
$ start=1
$ stride=10
$ for ((i=start; i<=count; i+=stride)); do
 awk -v i="$i" -v stride="$stride" 
 'NR > (i+stride) exit NR >= i && NR < (i + stride)' "$file" 
 | java ...
done

file holds the path to the data rows. count is the total count of rows in that file. start is the first row, stride is how many you want to slice out in each iteration.

The for loop then performs the stride addition, while awk slices out the rows so numbered. We pipe them to the java program on standard in.

Assuming that you are passing the 10 lines groups from your file to your script as command line arguments, this is an answer:

rows=4000 # the number of rows in file
groupsize=10 # the size of lines groups

OIFS="$IFS"; IFS=$'n' # use newline as input field separator to avoid `for` splitting on spaces
groups=$(($rows / $groupsize)) # the number of groups of lines
for i in $(seq 1 $groups); do # loop through each group of lines
 from=$((($i * $groupsize) - $groupsize + 1))
 to=$(($i * $groupsize))
 # build the arguments for each script invocation by concatenating each group of lines
 for line in `sed -n -e $from,$top file`; do # 'file' is your input file name
 arguments=$arguments "$line"
 done
 echo script $arguments # remove echo and change 'script' with your script name
done 
IFS="$OIFS" # restore original input field separator

Like this :

for ((i=0; i<=4000; i+=10)); do
 arr=( ) # create a new empty array
 for ((j=$i; j<=i+10; j++)); do
 arr+=( $j ) # add id to array
 done
 printf '%sn' "$arr[@]" # or execute command with all the id
done

This might work for you (GNU parallel):

parallel -kN10 javaProgram :::: file

This will pass the lines 1-10, 11-20, ... as arguments to program javaProgram

If you want to pass 10 lines at time, use:

parallel -kN10 --cat javaProgram :::: file