Decoding a string


 
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# 1  
Old 03-17-2012
Decoding a string

Hi,

If my input string is
Code:
3a3b4c

then my result should be
Code:
aaabbbcccc

. Please guide me how to achieve this in a bash script.

Thanks
# 2  
Old 03-17-2012
Code:
$ cat input
3a3b4c
4a5d2c
10a12b14c
3abc4xyz5pqr
$
$ perl -ne 'chomp;print$2x$1while(/(\d+)(\D+)/g);print"\n"' input
aaabbbcccc
aaaadddddcc
aaaaaaaaaabbbbbbbbbbbbcccccccccccccc
abcabcabcxyzxyzxyzxyzpqrpqrpqrpqrpqr
$

This User Gave Thanks to balajesuri For This Post:
# 3  
Old 03-17-2012
Thanks for your perl method. Out of interest, i want to accomplish in pure bash method.
Could you please suggest?
Thanks
# 4  
Old 03-18-2012
@pandeesh
Please show is your best effort and happened when you tried your own bash script.
# 5  
Old 03-19-2012
I have started writing the script:
Code:
############################RunLength_Decode###################################
#
#Implementatin of RunLength Decoding
#Written on:19March 11AM
#Author:Pandeeswaran
###############################################################################
#!/bin/bash
len=`echo $1|wc -c`
a=$1
for((i=0;i<=$len-1;i++))
do
ch=${a:$i:1}
echo $ch
if [ "${ch}" -eq "3" -o "${ch}" -eq "4" ]
then
res=${ch}
else
res=`echo "$res",`
fi
done

Code:
pandeeswaran@ubuntu:~/training$ bash RunLength_decode 3a
3
a
RunLength_decode: line 14: [: a: integer expression expected

RunLength_decode: line 14: [: : integer expression expected
pandeeswaran@ubuntu:~/training$

Please help me.
Thanks
# 6  
Old 03-19-2012
Code:
 
if [ "${ch}" -eq "3" -o "${ch}" -eq "4" ]

Should be

Code:
 
if [ "${ch}" = "3" -o "${ch}" = "4" ]
 
OR 
 
if [ ${ch} -eq 3 -o ${ch} -eq 4 ]

= for comparing string
-eq for numbers
This User Gave Thanks to max_hammer For This Post:
# 7  
Old 03-19-2012
Thanks .. Is there any shortcut to check or 0 to 9.
Here I checked or 3 or 4. Without using multiple -o , is there any simple way to check for 0-9?
Thanks
 
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