Line | |
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1 | #!/bin/sh |
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2 | |
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3 | #-----[ usage ]--------------------------------------------- |
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4 | function usage () |
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5 | { |
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6 | echo "Usage : $0 min max [step [iter]]"; |
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7 | echo " * min : value minimal"; |
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8 | echo " * max : value maximal"; |
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9 | echo " * step : step between two value. If no present, step = \"+1\""; |
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10 | echo " * iter : choose the Nième value"; |
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11 | exit; |
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12 | } |
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13 | |
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14 | #-----[ range ]--------------------------------------------- |
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15 | function range () |
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16 | { |
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17 | declare a=$1; |
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18 | declare b=$2; |
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19 | declare step=$3; |
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20 | |
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21 | while test $a -le $b; do |
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22 | echo $a; |
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23 | a=$(($a $step)); |
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24 | done |
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25 | } |
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26 | |
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27 | #-----[ range_max ]----------------------------------------- |
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28 | function range_max () |
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29 | { |
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30 | declare a=$1; |
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31 | declare b=$2; |
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32 | declare step=$3; |
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33 | declare iter=$4; |
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34 | |
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35 | while test $a -le $b -a $iter -gt 1; do |
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36 | a=$(($a $step)); |
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37 | iter=$(($iter-1)); |
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38 | done; |
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39 | |
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40 | if test $iter -eq 1; then |
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41 | echo $a; |
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42 | fi; |
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43 | } |
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44 | |
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45 | #-----[ main ]---------------------------------------------- |
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46 | function main () |
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47 | { |
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48 | # create operande |
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49 | case $# in |
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50 | 2) range $* "+1";; |
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51 | 3) range $* ;; |
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52 | 4) range_max $* ;; |
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53 | *) usage $* |
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54 | esac |
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55 | } |
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56 | |
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57 | #-----[ Corps ]--------------------------------------------- |
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58 | main $* |
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