Shell Programming and Scripting

#!/bin/kh or /bin/bash ...
#csvparse

# some sample.csv
echo "$(<<EOF 
name;age;girlfriend;random
aa;11;yes;$RANDOM
bb;22;yes;$RANDOM
cc;33;no;$RANDOM
dd;44;no;$RANDOM
ee;55;yes;$RANDOM
ff;44;
;44;no;$RANDOM
aa;55;no;xx;zz
EOF
)" > sample.csv

### csvparser
lastfld=0
flds[0]=""
val[0]=""
oifs="$IFS"
deli=";"
defdeli=";"
outdeli="$deli"
str=""

#####################################
initcolnames()
{
    Xcnt=$1
    Xdeli=$2
    Xstr=""
    Xfld=1
    while ((Xfld <= Xcnt ))
    do
        Xstr="${Xstr}col${Xfld}$Xdeli"
        ((Xfld+=1))
    done
    echo "$Xstr"
}
#####################################
setvar()
{
   str="$*"
   IFS="$deli"
   val=($str)
   IFS="$oifs"
   last=${#val[@]}
   f=0
   while ((f<=last && f<=lastfld))
   do
        var="${flds[$f]}"
        value="${val[$f]}"
        eval $var=\"$value\"
        ((f+=1))
   done

}

#####################################
showvar()
{
   f=0
   outstr=""
   Xoutdeli="$outdeli"
   while ((f<=lastfld))
   do
        var="${flds[$f]}"
        (( f == lastfld )) && Xoutdeli=""
        eval value=\""\$$var"\"
        outstr="$outstr$value$Xoutdeli"
        ((f+=1))
   done
   echo "$outstr"
}
#####################################
clrvar()
{
   f=0
   while ((f<=lastfld))
   do
        var="${flds[$f]}"
        eval $var=\"\"
        ((f+=1))
   done
}

#####################################
colnames()
{
    nf=0
    while [ $# -gt 0 ]
    do
        opt="$1"
        case "$opt" in
                -c) nf=$2       # no colnames, create
                   shift
                   ;;
                -d) defdeli=$2
                   shift
                   ;;
                *) str="$*" ; break ;;
        esac
        shift
    done

    (( nf > 0 )) && str=$(initcolnames $nf "$defdeli" )
    IFS="$deli"
    flds=($str)
    IFS="$oifs"
    lastfld=${#flds[@]}
    ((lastfld-=1))

}
#####################################
# MAIN
#####################################

deli=";"   # set input delimeter , or use -d option in colnames
outdeli=" | "
lineno=0
while read line
do
    ((lineno+=1))
    (( lineno == 1 )) && colnames "$line" && continue  # headerline = variable names
    clrvar
    setvar "$line"
    echo "________________________________"
    showvar

    # example using values
    [ "$name" = "cc" ] && echo "$name, age:$age"

done < sample.csv