Member Avatar for John Linux

Hi,

I am trying to write a Bash Script to sort some images but I am new to Bash and not having any luck.
I have a folder of images.

Example:
P100.jpg
P172.jpg
P342.jpg
P400.png

I need to change these filenames to <filename>_DEFAULT<extension>.
ie. P100_DEFAULT.jpg and then move the file into a folder with the name of the original file.

Pseudo:

    Load file list for directory

    For each file in the directory:
    {
        filename = <filename>
        newfilename = <filename>_DEFAULT<extension>
        mkdir <filename> #if directory doesn't exist
        mv <filename> <newdir/newfilename>
    }

NOTE: I will be running the script on MacOSX (BASH 3.2)

Any help will be appreciated.

  • 3 Contributors
  • 2 Replies
  • 264 Views
  • 4 Days Discussion Span
  • Latest Post Latest Post by histrungalot

Dani AI

Generated

Quick, safe alternative for that builds on 's suggestion but avoids common pitfalls (parsing ls, hard-coded extensions, and broken behavior on filenames with spaces). This version is macOS-friendly (Bash 3.2), operates only on the top-level files in the target folder, preserves each file's extension, creates a folder named after the base filename, appends _DEFAULT and avoids clobbering existing files by adding a small numeric suffix when needed.

#!/bin/bash
# usage: ./rename_sort.sh /path/to/dir
dir="${1:-.}"
shopt -s nullglob

for file in "$dir"/*; do
  [ -f "$file" ] || continue
  base="$(basename "$file")"
  if [[ "$base" == *.* ]]; then
    name="${base%.*}"
    ext="${base##*.}"
    dot=".$ext"
  else
    name="$base"
    ext=""
    dot=""
  fi

  mkdir -p "$dir/$name"
  new="$dir/$name/${name}_DEFAULT${dot}"
  # if target exists, add numeric suffix to avoid overwrite
  if [ -e "$new" ]; then
    n=1
    if [ -n "$ext" ]; then
      while [ -e "$dir/$name/${name}_DEFAULT_$n.$ext" ]; do n=$((n+1)); done
      new="$dir/$name/${name}_DEFAULT_$n.$ext"
    else
      while [ -e "$dir/$name/${name}_DEFAULT_$n" ]; do n=$((n+1)); done
      new="$dir/$name/${name}_DEFAULT_$n"
    fi
  fi

  printf "DRY: %s -> %s\n" "$file" "$new"
  # to perform the move, uncomment the next line:
  # mv "$file" "$new"
done

Notes: run this on a copy or in a test folder first (the script defaults to a dry run). If you want to process only particular extensions, filter the glob (e.g., "$dir"/*.jpg), but be aware that matching only one extension will skip others such as .png. This approach avoids the ls/command-substitution issues raised earlier and addresses the rename-and-move goal while handling spaces, missing extensions, and existing target files.

Recommended Answers

All 2 Replies

Member Avatar for razamughal67

what you mean change the file name and copy in a folder
are you want to a move copy of your file with a new name and move in another folderor
change the orignal file extention and rename
explain

Member Avatar for histrungalot
See if this helps
#!/bin/bash
if [ -d $1 ]
then
  cd $1
  for file in $(ls *.jpg)
  do
     newfile=${file%.jpg}"_DEFAULT"${file:(-4)}
     echo "New file name: $newfile"
  done
else
  echo "Directory $1 doesn't exist"
fi
Testing
$ ls ./temp
P100.jpg    P172.jpg    P342.jpg    P400.jpg
$ ./myScript temp/
New file name: P100_DEFAULT.jpg
New file name: P172_DEFAULT.jpg
New file name: P342_DEFAULT.jpg
New file name: P400_DEFAULT.jpg
$
Just add the rest
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