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+====== shellscript - automatically fix wrong filename extensions - fix-filename-extension.sh ======
+Its a little weird topic. But when you have to deal a lot with "non IT people" throwing around lots of files like photos and/or archive files and they mix up each and every file format and filename extensions, it quickly can get messy. This shell script is a early attempt to quickly and easily find these "messed up" (falsely renamed) files on a data volume and have the filename extension "fixed" if possible. This is specially important in mixed platform environment with Windows, Mac and Linux/Unix where sometimes apps act on filename extensions and sometimes on the actual file content.
+The shell script is nowhere near complete or comprehensive yet. But its a possible start and building block and might be a help for someone else too.
+:!: **Since this script actually modifies files in a filesystem recursively, actual use might be somewhat dangerous/harmful. So be warned and use at your own risk!**
+<file bash fix-filename-extension.sh>
+#!/bin/bash
+#
+# fix filename extension script Version 2018-12-08
+# in current directory (recursively)
+#
+# by Axel Werner    [axel.werner.1973@gmail.com]
+#                   [mail@awerner.myhome-server.de]
+#
+# CHANGE HISTORY:
+# =========================
+#
+# 2018-12-08    A.Werner    Release V1.0
+#
+#
+#
+#TODO:
+#   - xxxx
+#
+set -e
+#set -x
+# define some colors for console output
+RED='\033[91m'
+YELLOW='\033[93m'
+GREEN='\033[92m'
+BLUE='\033[96m'
+NOCOLOR='\033[0m'
+NC=$NOCOLOR
+function print {
+	echo -e "$@"
+}
+function printInfo {
+	echo -e "$NC""$@""$NC"
+}
+function printWarning {
+	echo -e "$YELLOW""$@""$NC"
+}
+function printError {
+	echo -e "$RED""$@""$NC"
+}
+function printDebug {
+	echo -e "$BLUE""DEBUG: $@""$NC"
+}
+function reportCaseDetected {
+    printDebug "\tcase '$newFileExtension' detected ..."
+}
+function toUpper {
+    echo "$@" | tr [a-z] [A-Z]
+}
+function toLower {
+    echo "$@" | tr [A-Z] [a-z]
+}
+function noSpaces {
+    echo "$@" | tr -d '[:space:]'
+}
+function testFileExtention {
+    fileExtensionIsUppercase=$( toUpper "$fileExtensionIs" )
+    newFileExtensionUpper=$( toUpper "$newFileExtension" )
+    if [ "$fileExtensionIsUppercase" = "$newFileExtensionUpper" ] ; then
+        printDebug "\tFile extension matches content."
+        return 0
+    else
+        printWarning "\tFile extension missmatch detected. File '$fileNameWithPath' is of type '$fileTypeDescCompressed'. Expected filename extension is: '$newFileExtension' ."
+        return -1
+    fi
+}
+find . -type f -print0 | while read -d $'\0' f ; do
+    fileNameWithPath="$f"
+    print "\nProcessing '$fileNameWithPath' ..."
+    fileTypeDescription=$(file "$fileNameWithPath" | cut -f2 -d':')
+    printDebug "\tFile Type is\t\t: '$fileTypeDescription'"
+    fileExtensionIs="${fileNameWithPath##*.}"
+    fileBaseNameNoExt="${fileNameWithPath%.*}"
+    printDebug "\tFile Extension is\t: '$fileExtensionIs'"
+    printDebug "\tFilename without Ext is\t: '$fileBaseNameNoExt'"
+    fileTypeDescCompressed=$( toUpper $( noSpaces "${fileTypeDescription}" ) )
+    case $fileTypeDescCompressed in
+        ( PNGIMAGEDATA* )
+            newFileExtension=png
+            reportCaseDetected
+            if ! testFileExtention ; then
+                mv -v "$fileNameWithPath" "${fileBaseNameNoExt}.${newFileExtension}"
+            fi
+            ;;
+        ( JPEGIMAGEDATA* )
+            newFileExtension=jpg
+            reportCaseDetected
+            if ! testFileExtention ; then
+                # test for special case when extension has an alternative name.
+                if [ $( toUpper $fileExtensionIs ) = $( toUpper "jpeg" ) ] ; then
+                    print "\t\tAlternative filename extention 'jpeg' accepted. Moving on..."
+                else
+                    mv -v "$fileNameWithPath" "${fileBaseNameNoExt}.${newFileExtension}"
+                fi
+            fi
+            ;;
+        ( *AVI*VIDEO )
+            newFileExtension=avi
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( ISOMEDIA*MP4V2* | ISOMEDIA*M4V*VIDEO | ISOMEDIA*MP4* )
+            newFileExtension=mp4
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( *ISOMEDIA*3GPP* )
+            newFileExtension=3gp
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( *RARARCHIVEDATA* | 7-ZIPARCHIVEDATA* )
+            newFileExtension='-ARCHIVE-'
+            reportCaseDetected
+            # we dont temper with archive files just yet.
+            ;;
+        ( *MATROSKADATA* )
+            newFileExtension=mkv
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( SENDMAIL* | DATA )
+            newFileExtension='-miscDataFile-'
+            reportCaseDetected
+            # we dont temper with misc data files just yet.
+            ;;
+        ( MICROSOFTASF )
+            newFileExtension=wmv
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( MPEGSEQUENCE,V1* )
+            newFileExtension=mpg
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( MACROMEDIAFLASHVIDEO )
+            newFileExtension=flv
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( DOSEXECUTABLE* )
+            newFileExtension='-DosExecutable-'
+            reportCaseDetected
+            # we dont temper with that files just yet.
+            ;;
+        ( WEBM )
+            newFileExtension=webm
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( BOURNE-AGAINSHELLSCRIPT* )
+            newFileExtension='-BashScript-'
+            reportCaseDetected
+            # we dont temper with shell script files just yet.
+            ;;
+        ( ASCIITEXT )
+            newFileExtension='-ASCII-'
+            reportCaseDetected
+            # we dont temper with ASCII files just yet.
+            ;;
+        ( *STRING* )
+            newFileExtension=EXTENSION
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( *STRING* )
+            newFileExtension=EXTENSION
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( *STRING* )
+            newFileExtension=EXTENSION
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( *STRING* )
+            newFileExtension=EXTENSION
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( *STRING* )
+            newFileExtension=EXTENSION
+            reportCaseDetected
+            # we dont temper with video files just yet.
+            ;;
+        ( * )
+            printError "ERROR: We dont know how to handle file type '$fileTypeDescCompressed' yet. Please extend this shell script manually so it gets better."
+            exit -1
+    esac
+done
+</file>
+ --- //[[mail@awerner.myhome-server.de|Axel Werner]] 2018-12-08 17:17//
+{{tag>linux cli bash shellscript file extensions filenames photos}}