Ubuntu – Resize multiple files and rename them properly

command line

I have a command line problem – probably a pretty easy one, but it seems I can't enter the right words into google.

So I want to resize all *.png images in the folder using imagemagick – this would be something like "convert -resize 80% " and I want "filename" → "small_filename"

So I tried:

for f in *.png ; convert -resize 80% "$f" "small_$f" ; done

but "syntax error near unexpected token `convert" – I suppose you can't just import imagemagick commands into the bash ?

I would be delighted if you could help.

Best Answer

You missed do after for ... string. Here is a slightly modified script, but your version will work also if you add do missing in there.

for f in *.png
  do
  echo "Converting $f."
  convert "$f" -resize 80% "${f/.png/-80%.png}"
done

A name changing here works as follows: for every $f as a text string find its .png part and change it for -80%.png

How it works:

Using a for loop and shell glob trapping the desired files,

    for i in *.bam
    do
        mv source destination
    done

Next extract the part that you want to keep i.e. the second field of the string separated by . using awk as,

    $ echo IonXpress_049.T11014.R_2014_11_13_11_26_35_user_PR2-41-Pooling0026_3140_13112014.bam | awk -F"." '{print $2}'
    $ T11014

One can use custom field separator using -F option. See man awk for more.

Best Answer

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