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deepblue_86
Asked: 2016-03-25 06:56:01 +0800 CST

adding zero to specific location of file names

  • 772

I have a directory consists of several files. Files name are as follows;

0102920.05o
0203920.05o
0304920.05o
....

I need to add "0" for all files after the first 4 numbers like;

01020920.05o
02030920.05o
03040920.05o

Is there a way to do it with bash or perl?

command-line

2 Answers

  1. Best Answer

    Use this command

    rename -n -v 's/(.{4})(.*)/${1}0${2}/' *

    See if the result is what you want, remove -n and -v options.

    Explanation:

    take this simple command:

    rename 's/pattern/result/' filename(s)

    Pattern can be regex. So, we can take different part of the text (which is the filename). If you don't understand it, google for regex.

    So in the command I suggest, in pattern, it divide the filename into two parts: first part which is first four characters and the second part is the rest.

    Now in the result part, we paste first part, add one 0 and then add the second part. As simple as this.

    If you can make proper regex, you can easily do bulk rename.

    • 5

  2. something like that can do the trick in bash for all files in current directory

    for filename in *;do
    mv "$filename" "${filename:0:4}0${filename:5:11}"
done
    • 3