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Shell Programming and Scripting

Add 0 in start of filename

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# 1  
Old 04-08-2013
Add 0 in start of filename
Code:
1 - abcd1.txt
2 - abcd2.txt
.
.
10  - abcd3.txt

need to write a script to rename all files that start with a number less than 10, to have a zero in front. ie. 1 - abcd1.txt will be renamed to 01 - abcd1.txt.
# 2  
Old 04-08-2013
Show what you tried first.
# 3  
Old 04-08-2013
Currently nothing in mind that's why ask question here for help. I think need to use find command but stuck in checking of less than 10.
# 4  
Old 04-08-2013
Show your find command etc., show your code.
# 5  
Old 04-08-2013
Nothing yet started, because this checking thing sucks and stop my mind that's why.

---------- Post updated at 01:10 PM ---------- Previous update was at 01:04 PM ----------

Please suggest this one.

Code:
#!/bin/bash
#
for i in *.txt
  do mv "$i" "0-${i/.txt}"
done

# 6  
Old 04-08-2013
Based on some assumptions:
Code:
#!/bin/bash

for file in *.txt
do
        num="${file//[[:alpha:].]/}"
        nam="${file//[[:digit:].txt]/}"
        printf "%s%02d.txt\n" $nam $num
done

If this works for you, assign printf result to a variable and perform the rename.
# 7  
Old 04-08-2013
It is giving below output.

Code:
sh1.sh: line 7: printf: 10-3: invalid number
-abcd10.txt
sh1.sh: line 7: printf: 1-3: invalid number
-abcd01.txt

I need to change 1-abcd1.txt to 01-abcd1.txt and 2-abcd2.txt to 02-abcd2.txt and do till 09-abcd9.txt not do only 10
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