寫shell script必須要先了解LVL的語法內容才有辦法，知道應該要如何來達到我們要的效果，所以必須先看上一篇LVL command file 範例。
廢話不多說，以下先分享shell script範例，再做解說。
LVL Shell Script Example.
#! /bin/bash
##script name: genLVL.sh
##description:
## This script is used to make LVL rule file.
##Author: ron.huang
##History:
## 2021/06/22 ron.huang release
##usage:
## 1.Please modify the layer map to the following format first.
## 2.Modify customized region
## 3.Run script ex. ./genLVL.sh
##customized region
LAYERMAP=layermap
LVLFILE=lvl.cal
## Do not modify below
getLayerNames=$(cat $LAYERMAP | awk '{print $1}');
getPurpuseNames=$(cat $LAYERMAP | awk '{print $2}');
getLayerNumbers=$(cat $LAYERMAP | awk '{print $3}');
getDatatypeNumbers=$(cat $LAYERMAP | awk '{print $4}');
seq=1
for layerName in $getLayerNames;
do
layerNames[$seq]=$layerName
((seq++))
done
seq=1
for purpuseName in $getPurpuseNames;
do
purpuseNames[$seq]=$purpuseName
((seq++))
done
seq=1
for layerNumber in $getLayerNumbers;
do
layerNumbers[$seq]=$layerNumber
((seq++))
done
seq=1
for datatypeNumber in $getDatatypeNumbers;
do
datatypeNumbers[$seq]=$datatypeNumber
((seq++))
done
echo "//$LVLFILE" > $LVLFILE
echo '//description: Compare the differences between the two gds.' >> $LVLFILE
echo "//use genLVL.sh to generate at $(date '+%Y/%m/%d %H:%M')" >> $LVLFILE
echo "//History:" >> $LVLFILE
echo ' ' >> $LVLFILE
echo '//SPECIFY FIRST DATABASE' >> $LVLFILE
echo 'LAYOUT PRIMARY "TOP_CELL_NAME"' >> $LVLFILE
echo 'LAYOUT PATH "top.gds"' >> $LVLFILE
echo 'LAYOUT SYSTEM GDSII' >> $LVLFILE
echo ' ' >> $LVLFILE
echo '//SPECIFY SECOND DATABASE' >> $LVLFILE
echo 'LAYOUT PRIMARY2 "TOP_CELL_NAME2"' >> $LVLFILE
echo 'LAYOUT PATH2 "top2.gds"' >> $LVLFILE
echo 'LAYOUT SYSTEM2 GDSII' >> $LVLFILE
echo 'LAYOUT BUMP2 1000 // add 1000 to layer number for the second database' >> $LVLFILE
echo ' ' >> $LVLFILE
echo '//OUTPUT REPORT' >> $LVLFILE
echo 'DRC RESULTS DATABASE "top.lvl.db" ASCII' >> $LVLFILE
echo 'DRC SUMMARY REPORT "top.lvl.rep"' >> $LVLFILE
echo ' ' >> $LVLFILE
echo 'DRC MAXIMUM RESULTS ALL' >> $LVLFILE
echo 'PRECISION 1000' >> $LVLFILE
echo 'RESOLUTION 1' >> $LVLFILE
echo ' ' >> $LVLFILE
echo '//LAYER COMPARE' >> $LVLFILE
for ((i=1;i<=${#layerNames[@]};i++));
do
LD=$((i+2000))
echo "LAYER ${layerNames[$i]}_${purpuseNames[$i]} $LD LAYER MAP ${layerNumbers[$i]} DATATYPE ${datatypeNumbers[$i]} $LD" >> $LVLFILE
LD2=$((LD+1000))
LN2=$((${layerNumbers[$i]}+1000))
echo "LAYER ${layerNames[$i]}_${purpuseNames[$i]}_Sec $LD2 LAYER MAP $LN2 DATATYPE ${datatypeNumbers[$i]} $LD2" >> $LVLFILE
echo "DIFF.${layerNames[$i]}.${purpuseNames[$i]} {@ ${layerNames[$i]}:${purpuseNames[$i]}[${layerNumbers[$i]}:${datatypeNumbers[$i]}] is different from the ${layerNames[$i]}:${purpuseNames[$i]}[${layerNumbers[$i]}:${datatypeNumbers[$i]}] of another GDS" >> $LVLFILE
echo "${layerNames[$i]}_${purpuseNames[$i]} XOR ${layerNames[$i]}_${purpuseNames[$i]}_Sec" >> $LVLFILE
echo "}" >> $LVLFILE
done