Problem with string append

[hirav]

Hi all,

I am new to linux shell script and I am currently facing a strange problem. Currently I am working on , in which I have a string and I have to parse it to a specific string.

My problem is as like below.

echo $str1
# data1_data2_data3_data4 /. this string I have got from substring of main string
# now what I want to do is

str2="dt5_dt6.pdf"
a=$str1"_"$str2
echo $a
# that should print data1_data2_data3_data4_dt5_dt6.pdf but instead it prints like below "_dt4_dt6.pdfdata3_data4"

# in short it replaces str1's data with the str2's data from starting of str1


Please help me to solve this strange problem

Thanks in advance

[tpl]

ok, here's to try:

1. make a "str0" that contains and underscore '_'

2. paste -d " " str1 str0 str2 >str3

3. tr -d " " <str3 >str4

4. then str4 should be what you want

[hirav]

Thanks for replying..

I have tried your code but it gives me following error

$str3: ambiguous redirect

I am copying my code here,

echo "sub Final 0 :" $PDFNM // prints "data1_data2_data3_data4"
echo "PI :" $PI // prints "dt5_dt6.pdf"
str0="_"
str3=""
str4=""

-d " " $PDFNM $str0 $PI >$str3 //gives error @ this line & below line
tr -d " " <$str3 >$str4
echo $str4



I might be wrong in syntax, as I am totally new in shell scripts...Please help me solve this issue

Thanks again