Shell Programming and Scripting

# cat -n /temp/script.sh
     1  #!/bin/bash
     2
     3  if [ ${#} -lt 2 ] || [ ! -r $1 ];then
     4          echo "Usage: $0 input.file row:count row:count ....etc";
     5          exit 1;
     6  fi
     7  file=$1 && shift
     8  while (($#)); do
     9          array[${1%:*}]=${1#*:}
    10          shift
    11  done
    12  cnt1=0
    13  while read line;do
    14          let cnt1++
    15          if [ ! -z ${array[${cnt1}]} ];then
    16                  cnt2=${array[${cnt1}]}
    17                  while [ $cnt2 -gt 0 ];do
    18                          echo $line
    19                          let cnt2--
    20                  done
    21          fi
    22  done < $file

# /temp/script.sh /temp/file.in 2:3 4:5
line 2
line 2
line 2
line 4
line 4
line 4
line 4
line 4