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How to expand the same word?

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# 1  
Old 12-29-2009
How to expand the same word?
Hi All,
May I know how to expand the words?
e.g:
a
aa
aaa
aaaa
I have try to use
for (i=0;i<5;i++)
do
c="a"
echo -n $c
done
but the output is aaaaa. Is it need to use array?Smilie
Thanks for your help!
# 2  
Old 12-29-2009
Using bash
Code:
# i=1;a=; while [ ${i} -lt 5 ];do a="${a}a";echo $a;let i++;done
a
aa
aaa
aaaa

# 3  
Old 12-29-2009
Code:
for ((i=1;i<5;i++));  do  for ((j=1;j<=$i;j++)); do echo -n "a"; done;  echo;done

# 4  
Old 12-29-2009
Try:

Code:
perl -e 'for ($i=0;$i++<5;) { print "a" x $i ."\n"; }'

# 5  
Old 12-29-2009
Or you can use Ruby Smilie

Code:
$
$ ruby -le '4.times{|y|print "a"*(y+1)}'
a
aa
aaa
aaaa
$

tyler_durden
# 6  
Old 12-29-2009
Hi Guys,

Really thanks for your kind help! Smilie
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