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Small help required to create For loop

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Top Forums Shell Programming and Scripting Small help required to create For loop
# 1  
Old 06-04-2012
Small help required to create For loop
Hi,
I am new to UNIX and have an issue.
I need to check that whether a perticular file name exists or not. I wan to do that in loop to avoid number of IF statements.
I need to check that
if file10.txt exists rename that to file11.txt.
if file9.txt exists rename that to file10.txt.
:
:
if file1.txt exists rename that to file2.txt.

Please help.
Thanks.
# 2  
Old 06-04-2012
Assuming you never go higher than 11:
Code:
cnt=10
while [ $cnt -gt 0 ]
do
   fname=file${cnt}.txt
   if [ -r $fname ];  then
         next=$(( $cnt + 1 ))
         tmp=file${next}.txt
         mv $fname $tmp
   fi
done

next and tmp added for clarity.
# 3  
Old 06-04-2012
Thanks a lot. But it seems we are not reducing the value of the CNT in this logic.How will we do that?
# 4  
Old 06-04-2012
MySQL
It is ideally
Code:
next=$(( $cnt - 1 ))

Looks like a typo to me.
# 5  
Old 06-04-2012
No, the increment is correct... Try:

Code:
cnt=11
while [ $((cnt-=1)) -gt 0 ]

# 6  
Old 06-04-2012
Thanks a lot for the help. Yes the increment was for moving the file name to new one. I was not able to decrease the count. Thanks again to both of you.
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