Challenge to change file names

Shell Programming and Scripting
1

Hi,

How can I change following file name in a bash script?

From file names:

myfile-module-1.0-3.0.el6.x86_64.package

To file names:

myfile-module1_0-1.0-3.0.el6.x86_64.package

                            ^ ^ ^ ^ ^ ^ ^ ^

Basically, the digit 1.0 is a version number, the digit 3.0 is a release number, I need to add the version number to module name and change the version number "." to "_". So the module name "module" becomes "module1_0", the rest are identical.

Thank you.

Kind regards.

2

Is gawk available?

echo 'myfile-module-1.0-3.0.el6.x86_64.package' | awk -F- '{$2=$2 gensub(/\./,"_","",$3)}1' OFS="-"
myfile-module1_0-1.0-3.0.el6.x86_64.package
3

Bash pattern replacement:

filename="myfile-module-1.0-3.0.el6.x86_64.package"
echo ${filename/./_}

Oh I misread the requirement. Please disregard this post. Thanks mirni for pointing that out :b:

4

but that is not what he/she wanted. The version number is to be kept intact, but module name is to be changed.

5

Brilliant, that works well. The only thing I forgot to mention was that the version number could be 2 digits 1.0, or 3 digits 1.1.1, or 4 digits 1.2.1.1. Can it be adapted to different digits of version numbers?

Thank you so much, very appreciated.

Cheers.

6

Easy. Just add "g" for "global" substitution:

awk -F- '{$2=$2 gensub(/\./,"_","g",$3)}1' OFS="-"
7

Ahh, that's the tricky. I played with awk, but could not figure it out. Lots to learn :-). Thank you so much.

Cheers.

8

I believe bipinijith was on the right track, but didn't quite follow through with what was requested. This uses a shell expansion that is not defined by the standards, but is available in recent versions of both ksh and bash:

for i in *-module-*
do      echo mv $i ${i/-module-/-module1_0-}
done

Remove the echo after verifying that the mv commands it will print do what you want to have done.

9

But you hardcoded version 1.0 in there. What if it's 2.3.4? Although the parameter expansion supports nested vars, like ${i/foo/${bar}} , you have to grab the version somehow.

10

Hi mirni,
Quoting from the original request: "So the module name "module" becomes "module1_0", the rest are identical." I just did what was requested.

11 
sed 's/-\([0-9][0-9]*\).\([0-9][0-9]*\)-/\1_\2-\1.\2-/'

Try this if you want to use sed.

12

A little easier to read, assuming your sed supports -r option.
If your sed does not support -r option, you should switch to GNU sed.

sed -r 's/-([0-9]+).([0-9]+)-/\1_\2-\1.\2-/'