CODEWITHSUNDEEP
bashshell
sdabet
sdabet

Reputation: 18670

Shell command to format numbers inside filenames

I have a folder containing the following files:

trackingData-00-1.data, trackingData-00-2.data, ..., trackingData-00-2345.data

And I would like to rename them by formatting numbers with 4 digits

trackingData-00-0001.data, trackingData-00-0002.data, ..., trackingData-00-2345.data

How can I achieve that with a bash shell command?

Upvotes: 3

Views: 4708

Answers (4)

fedorqui
fedorqui

Reputation: 289565

You can use printf's options in awk to print four digits:

echo 3 | awk '{printf ("%04i", $1)}'
0003
echo 33 | awk '{printf ("%04i", $1)}'
0033

So it could be:

for file in trackingData*
do
  num=$(awk -F[.-] '{printf ("%04i", $3)}' <<< "$file")
  mv $file trackingData-00-$num.data
done

This uses awk with both field separators: either . or -. Then, it takes the 3rd block based on them and formats its value with the %04i flag (almost equivalent to %d as seen in The GNU Awk User’s Guide #5.5.2 Format-Control Letters).

Upvotes: 2

chepner
chepner

Reputation: 531055

A pure bash solution:

for f in trackingData-00-*.data; do
    [[ $f =~ trackingData-00-([0-9]+).data ]]
    mv "$f" $(printf "trackingData-00-%04d.data" ${BASH_REMATCH[1]})
done

A regular expression extracts the number to pad and stores it in the BASH_REMATCH array. Then printf is used to create the new file name, with the number reinserted and padded with zeros.

Upvotes: 7

JIghtuse
JIghtuse

Reputation: 876

dirty but working hack:

for i in $(seq 2345); do
    mv trackingData-00-$i.data trackingData-00-`printf %04d $i`.data;
done

Upvotes: 2

Kent
Kent

Reputation: 195039

first of all, I assume that there is no spaces in your file name. then

ls/find...| awk -F'-|\\.' '{o=$0;$3=sprintf("%04d",$3);$4=".data";gsub(/-\./,".");print "mv "o" "$0}' OFS='-'

will print the mv ... command. to execute them, just pipe the output to sh like

ls...|awk ..|sh

the core is the awk part, test it a bit:

kent$  echo "trackingData-00-1.data
trackingData-00-2.data"|awk -F'-|\\.' '{o=$0;$3=sprintf("%04d",$3);$4=".data";gsub(/-\./,".");print "mv "o" "$0}' OFS='-'                                                   
mv trackingData-00-1.data trackingData-00-0001.data
mv trackingData-00-2.data trackingData-00-0002.data

Upvotes: 1

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