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Rename first N numeric strings in filename

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# 1  
Old 04-11-2019
Rename first N numeric strings in filename
Hello,
I have some video files containing numbers and characters . To tell the problem shortly, due to a limitation, I am unable create a playlist regularly changing on a daily basis with the command shuffle....So I decided to rename filenames, just a replacement of first five numbers randomly.
myfiles:
Code:
87338ArianaGrandebreakupwithyourgirlfriendimboredLH4Y1ZUUx2g.mp4
92593ArianaGrandebreathinkN0iD0pI3o0.mp4
29003ArianaGrandeDangerousWoman9WbCfHutDSE.mp4
29024ArianaGrandeFocuslfwVfwpfp8.mp4
39043ArianaGrandeGodisawomankHLHSlExFis.mp4

Code:
for i in `seq 5`
do
A=$( echo "$((10000 + RANDOM % 9999))" )
echo "$A"
done

Number creation is okay with above command..
Code:
11111
18367
12008
15249
10059

Expected output:
Code:
11111ArianaGrandebreakupwithyourgirlfriendimboredLH4Y1ZUUx2g.mp4
18367ArianaGrandebreathinkN0iD0pI3o0.mp4
12008ArianaGrandeDangerousWoman9WbCfHutDSE.mp4
15249ArianaGrandeFocuslfwVfwpfp8.mp4
10059ArianaGrandeGodisawomankHLHSlExFis.mp4

How can I do it? Is there a command to separate numeric / alphanumeric fields ?

Thank you
Boris
# 2  
Old 04-11-2019
With a recent shell (which you alas fail to mention) try "Parameter expansion / Substring Expansion":
Code:
for FN in *.mp4; do echo mv "$FN" "$((10000 + RANDOM % 9999))${FN:5}"; done

If you know for sure its five leading digits, why do you think you need tell numeric from alpha characters?
These 2 Users Gave Thanks to RudiC For This Post:
baris35 rbatte1
# 3  
Old 04-11-2019
Code:
$ for i in *.mp4
> do
> Num=${i%%[a-zA-Z]*}
> echo mv $i $((10000 + RANDOM % 9999))${i#$Num}
> done
mv 29003ArianaGrandeDangerousWoman9WbCfHutDSE.mp4 12880ArianaGrandeDangerousWoman9WbCfHutDSE.mp4
mv 29024ArianaGrandeFocuslfwVfwpfp8.mp4 17588ArianaGrandeFocuslfwVfwpfp8.mp4
mv 39043ArianaGrandeGodisawomankHLHSlExFis.mp4 19680ArianaGrandeGodisawomankHLHSlExFis.mp4
mv 87338ArianaGrandebreakupwithyourgirlfriendimboredLH4Y1ZUUx2g.mp4 17652ArianaGrandebreakupwithyourgirlfriendimboredLH4Y1ZUUx2g.mp4
mv 92593ArianaGrandebreathinkN0iD0pI3o0.mp4 17909ArianaGrandebreathinkN0iD0pI3o0.mp4

# 4  
Old 04-11-2019
If you want to replace the leading digits no matter how many by exactly 5 random digits, i.e. 10000 - 99999, try (bash)

Code:
for FN in *.mp4; do echo mv "$FN" "$((10000 + 90000 * RANDOM / 32767))${FN#${FN%%[[:alpha:]]*}}"; done

# 5  
Old 04-11-2019
Thank You Both,
I am sorry for my delayed return.
I am a bit busy with different sort of software problems now.

Dear Anbu,
Could you please explain the function of ${i#$Num}
I am trying to understand what you are aiming with that.

Dear Rudic,
Need more time to understand this.
What does FN#$ stand for? Especially #

Thanks
Boris
# 6  
Old 04-11-2019
man bash:
Quote:
${parameter#word}
${parameter##word}
Remove matching prefix pattern. The word is expanded to produce a pattern just as in pathname expansion. If the pattern matches the beginning of the value of
parameter, then the result of the expansion is the expanded value of parameter with the shortest matching pattern (the ``#'' case) or the longest matching pat”
tern (the ``##'' case) deleted.

The inner ${FN%%[[:alpha:]]*} removes all chars from the first alpha to string end, then ${FN#...} uses the result to remove the leading digits, no matter how many.
This User Gave Thanks to RudiC For This Post:
baris35
# 7  
Old 04-11-2019
Thank you Rudic,
That's what I wanted to do.
I will give both solutions a go in soonest available time.

Kind regards
Boris
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