awk in practise
I recently made a contribution to my friend’s affair that need to batchly vote on a java website
Hence I write a bash script to deal with this, at the meantime, I have learnt a lot of things about bash.
function getParameter()
{
if [ $1 == "" ]
then
exit
fi
DATA=$(cat $DATA_FILE)
PATTERN=$1
pos=$(echo | awk -v "DATA=$DATA" -v "PATTERN=$PATTERN" '{print index(DATA,PATTERN)}')
#find JSON parameter name
subed=$(echo ${DATA:$pos-1+${#PATTERN}+3})
#positionize
pos=$(echo | awk -v "DATA=$subed" -v "PATTERN=\"" '{print index(DATA,PATTERN)}')
#positionize first " in JSON
value=$(echo ${subed:0:$pos-1})
#subtract JSON parameter value
echo $value
}