Need help writing a script to traverse through files in a directory

Question

I want to go through a directory and sub directories and convert files into jpg ones
I have this code I've been using: mkdir jpegs; sips -s format jpeg *.png --out jpegs
This is great for one directory at a time
But, what I want is to apply this to all sub directories, create a jpeg directory in each of the sub directories and then create jpg's and put them in there
I'm not sure where to start
Should I be looking for 'scripting in linux'?
Thanks
Omar

Answer 1

Hello
You may also try something like this. Set DIR to the root directory to start the search.
#!/bin/bash
#     convert png to jpeg and put jpeg in jpegs sub-directory
DIR=~/Desktop/test
while read -d $'\0' f
do
    d=${f%/*}/jpegs
    [[ -d "$d" ]] || mkdir "$d"
    sips -s format jpeg "$f" --out "$d"
done < <(find "$DIR" -type f -iname '*.png' -print0)
In case, here's an AppleScript wrapper:
set f to (choose folder with prompt "Choose root folder to process")'s POSIX path
if f ends with "/" then set f to f's text 1 thru -2
do shell script "/bin/bash -s <<'EOF' -- " & f's quoted form & "
#     convert png to jpeg and put jpeg in jpegs sub-directory
DIR=\"$1\"
while read -d $'\\0' f
do
    d=${f%/*}/jpegs
    [[ -d \"$d\" ]] || mkdir \"$d\"
    sips -s format jpeg \"$f\" --out \"$d\"
done < <(find \"$DIR\" -type f -iname '*.png' -print0)
EOF"
Regards,
H