Rename Files to Md5 Sum + Extension (Bash)

Rename files to md5 sum + extension (BASH)

This might work for you:

# mkdir temp && cd temp && touch file.{a..e}
# ls
file.a  file.b  file.c  file.d  file.e
# md5sum * | sed -e 's/\([^ ]*\) \(.*\(\..*\)\)$/mv -v \2 \1\3/' | sh
`file.a' -> `d41d8cd98f00b204e9800998ecf8427e.a'
`file.b' -> `d41d8cd98f00b204e9800998ecf8427e.b'
`file.c' -> `d41d8cd98f00b204e9800998ecf8427e.c'
`file.d' -> `d41d8cd98f00b204e9800998ecf8427e.d'
`file.e' -> `d41d8cd98f00b204e9800998ecf8427e.e'

Or GNU sed can do it even shorter:

# md5sum * | sed -e 's/\([^ ]*\) \(.*\(\..*\)\)$/mv -v \2 \1\3/e'

Rename files to hash and extension

I find this easier to read and follow:

#!/bin/bash

source_dir=/home/hermit/Documents/Pictures
destination_dir=/home/hermit/Documents/HashPictures

for file in "${source_dir}"/*;do

    hash=$(md5sum "${file}"|cut -d' ' -f1)

    ext=${file##*.}

    cp -v "$file" "${destination_dir}/${hash}.${ext}"

done

How to rename files inside folder to its corresponding md5sum?

See Why you shouldn't parse the output of ls or find in a for-loop, ParsingLs,

If you have file names with spaces also recommend using -print0 option of GNU findutils for the job which embeds a \0 character after file name with read with a null delimiter as below.

Run the script below inside /home/SomeFolder and use find from the current directory as

#!/bin/bash

while IFS= read -r -d '' file
do
    mv -v "$file" "$(md5sum $file | cut -d ' ' -f 1)"
done< <(find . -mindepth 1 -maxdepth 1 -type f -print0)

The depth options ensure the current folder . is not included in the search result. This will now get all the files in your current directory ( remember it does not recurse through sub-directories) and renames your file with the md5sum of the filenames.

The -v flag in mv is for verbose output ( which you can remove) for seeing how the files are to be renamed as.

Replace the complete filenames for files with their MD5 hash string of the content in bash

Make things simple by making use the glob patterns that the shell provides, instead of using external utilities like find. Also see Why you don't read lines with "for"

Navigate inside the folder /home/admin/test and do the following which should be sufficient

for file in *; do
    [ -f "$file" ] || continue
    md5sum -- "$file" | { read sum _; mv "$file" "$sum"; }
done

Try using echo inplace of mv first to check once if they files are renamed as expected.

To go to sub-directories below, which I assume would also be your requirement, enable globstar, which is one of the extended globing options provided by the shell to go deeper

shopt -s globstar
for file in **/*; do

Rename files to CRC32 and extension

Here is a step by step explanation:

$ ls -1
abc.txt
def.txt
ghi.txt

$ crc32 *
c7e06c1a        abc.txt
042999b4        def.txt
e686c130        ghi.txt

$ crc32 * | sed -e "s/^\(\S*\)\s*\(.*\(\..*\)\)$/mv -v \2 \1\3/g"
mv -v abc.txt c7e06c1a.txt
mv -v def.txt 042999b4.txt
mv -v ghi.txt e686c130.txt

what happens in detail:

s/                  # substitute the following expression
^                   # begin of line
\(\S*\)             # store every char until whitespace  (\1)
\s*                 # whitespace
\(.*                # store every char...                (\2)
\(\..*\)            # until '.', store it extra          (\3)
\)                  # end brace of \2
$                   # end of line
/mv -v \2 \1\3      # command with stored arguments
/g                  # global, on the whole line

to perform in one step, replace the "g" with an "e"

$ crc32 * | sed -e "s/^\(\S*\)\s*\(.*\(\..*\)\)$/mv -v \2 \1\3/e"
renamed 'abc.txt' -> 'c7e06c1a.txt'
renamed 'def.txt' -> '042999b4.txt'
renamed 'ghi.txt' -> 'e686c130.txt'

if you are not using gnu sed, remove "e" and add "| sh"

crc32 * | sed -e "s/^\(\S*\)\s*\(.*\(\..*\)\)$/mv -v \2 \1\3/" | sh

Will changing a file name affect the MD5 Hash of a file?

The usual definition of "MD5 hash of a file" is that the hash is based on the file contents. The name can be freely changed.

$hash1 = md5(file);
// change file name
$hash2 = md5(file);

The two hash codes will be the same.

In some (fairly specialized) use cases, file metadata (name, time stamp(s), etc.) are part of the data used to compute the hash. Then

$hash1 = md5(file);
// change file name
$hash2 = md5(file);

will produce two separate hashes.

How to rename files with output from program in bash?

You can reuse the answer from: Rename files to md5 sum + extension (BASH)

By modifying a little bit it will do exactly what you want (I already edited the command for you):

md5sum * | sed -e 's/\([^ ]*\)  \(.*\)$/mv -v "\2" \1/' | sh

Example of output:

'a' -> 'b026324c6904b2a9cb4b88d6d61c81d1'
'b' -> '26ab0db90d72e28ad0ba1e22ee510510'
'c' -> '6d7fce9fee471194aa8b5b6e47267f03'

Rename files to md5 sum + extension on Windows 7 (with CMD or PowerShell 2013)

You didn't write what you've already got, so I won't explain the script. Just remember that you'll get an error for files with same md5.

Get-ChildItem d:\temp\*.xxx | select FullName, Extension, @{name='md5'; expression={(Get-FileHash $_ -Algorithm md5).Hash}} | foreach {Rename-Item $_.FullName -NewName "$($_.md5)$($_.extension)"}

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