CODEWITHSUNDEEP
linuxbashtouch
redleo85
redleo85

Reputation: 249

Change modification date to filename

I've got a number of files of which I want to change the modification date in linux. The modification date is saved in the filename.

So I've got files, whose name is for example "IMG_20180101_010101.jpg", but the modification date is today. I want to change the modification date to 2018-01-01 01:01:01, as in the filename. I've tried with find and touch:

find . -iname 'IMG*' -print | while read filename; do touch -t {filename:7:8} "$filename"; done

When I do this I always get an error ("invalid date format: {filename:7:8}).

What am I doing wrong?

Upvotes: 0

Views: 435

Answers (2)

Neo
Neo

Reputation: 46

If I understood good, you would like to write the file names in your own format. What about this script:

#!/bin/bash

suffix=".jpg"

for file in "IMG*"; do # Careful, the loop will break on whitespace
    fileDate=$(echo $file| cut -d'_' -f 2)
    year=${fileDate:0:4}
    month=${fileDate:4:2}
    day=${fileDate:6:2}

    fileHour=$(echo $file| cut -d'_' -f 3 | sed -e s/$suffix//)
    hour=${fileHour:0:2}
    min=${fileHour:2:2}
    secs=${fileHour:4:2}
    newName="$year-$month-$day $hour:$min:$secs$suffix"
    mv $file "$newName"
done

Upvotes: 0

oliv
oliv

Reputation: 13249

If you want to set the file timestamp according to the filename, you can try this:

find -type f -name "IMG_*" -exec bash -c 'touch -t $(sed "s/.*IMG_\([0-9]\{8\}\)_\([0-9]\{4\}\)\([0-9]\{2\}\).jpg$/\1\2.\3/" <<< "$1") "$1"' _ {} \;

As mentionned in the touch man page, the option -t expects a format [[CC]YY]MMDDhhmm[.ss]. That's the purpose of the sed command.

Upvotes: 1

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