From Newsgroup: alt.os.linux.ubuntu

An improved version. This alerts you if the file to be renamed matches
an already existing file since you can't have two files with identical
names.


#!/bin/bash
# Check if zenity is installed
if ! command -v zenity &> /dev/null; then
echo "Zenity is required but not installed. Please install it using
'sudo apt-get install zenity' or equivalent."
exit 1
fi

# Get search string from user
search_string=$(zenity --entry \
--title="Search String" \
--text="Enter characters to search for:" \
--width=300)

# Check if user cancelled
if [ $? -ne 0 ]; then
exit 0
fi

# Check if search string is empty
if [ -z "$search_string" ]; then
zenity --error --text="Search string cannot be empty!" --width=200
exit 1
fi

# Get replace string from user
replace_string=$(zenity --entry \
--title="Replace String" \
--text="Enter characters to replace with:" \
--width=300)

# Check if user cancelled
if [ $? -ne 0 ]; then
exit 0
fi

# Count files that will be renamed and check for conflicts
count=0
conflicts=()
for file in *; do
if [[ "$file" == *"$search_string"* ]]; then new_name="${file//$search_string/$replace_string}"
if [ "$file" != "$new_name" ]; then
if [ -e "$new_name" ]; then
conflicts+=("$new_name")
else
((count++))
fi
fi
fi
done

# If there are conflicts, show error and exit
if [ ${#conflicts[@]} -gt 0 ]; then
conflict_list=$(printf "%s\n" "${conflicts[@]}")
zenity --error --text="Cannot rename files. The following files already exist:\n$conflict_list" --width=400
exit 1
fi

# If no files match, inform user and exit
if [ $count -eq 0 ]; then
zenity --info --text="No files found containing '$search_string'."
--width=200
exit 0
fi

# Perform rename operation
for file in *; do
if [[ "$file" == *"$search_string"* ]]; then new_name="${file//$search_string/$replace_string}"
if [ "$file" != "$new_name" ]; then
mv -n "$file" "$new_name"
if [ $? -eq 0 ]; then
echo "Renamed: $file -> $new_name"
else
zenity --error --text="Error renaming $file to $new_name" --width=200
fi
fi
fi
done

# Show completion message
zenity --info --text="Renaming complete. $count files processed."
--width=200
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