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copied!<p><strong>Updated to fix:<br></strong> 1. File names with '[' or ']' in their name (really, any character now. See comment)<br> 2. Handling of md5sum when hashing a file with a backslash or newline in its name<br> 3. Functionized hash-checking algo for modularity<br> 4. Refactored hash-checking logic to remove double-negatives<br></p> <pre><code>#!/bin/bash if (($# != 1)) || ! [[ -d "$1" ]]; then echo "Usage: $0 /path/to/directory" exit 1 fi is_hash() { md5=${1##*.} # strip prefix [[ "$md5" == *[^[:xdigit:]]* || ${#md5} -lt 32 ]] && echo "$1" || echo "${1%.*}" } while IFS= read -r -d $'\0' file; do read hash junk < <(md5sum "$file") basename="${file##*/}" dirname="${file%/*}" pre_ext="${basename%.*}" ext="${basename:${#pre_ext}}" # File already hashed? pre_ext=$(is_hash "$pre_ext") ext=$(is_hash "$ext") mv "$file" "${dirname}/${pre_ext}.${hash}${ext}" 2> /dev/null done < <(find "$1" -path "*/.*" -prune -o \( -type f -print0 \)) </code></pre> <p>This code has the following benefits over other entries thus far</p> <ul> <li><strong>It is fully compliant with Bash versions 2.0.2 and beyond</strong></li> <li>No superfluous calls to other binaries like sed or grep; uses builtin parameter expansion instead</li> <li>Uses process substitution for 'find' instead of a pipe, no sub-shell is made this way</li> <li>Takes the directory to work on as an argument and does a sanity check on it</li> <li>Uses $() rather than `` notation for command substitution, the latter is deprecated</li> <li>Works with files with spaces</li> <li>Works with files with newlines</li> <li>Works with files with multiple extensions</li> <li><strong>Works with files with no extension</strong></li> <li>Does not traverse hidden directories</li> <li><strong>Does <em>NOT</em> skip pre-hashed files, it will recalculate the hash as per the spec</strong></li> </ul> <h3>Test Tree</h3> <pre> $ tree -a a a |-- .hidden_dir | `-- foo |-- b | `-- c.d | |-- f | |-- g.5236b1ab46088005ed3554940390c8a7.ext | |-- h.d41d8cd98f00b204e9800998ecf8427e | |-- i.ext1.5236b1ab46088005ed3554940390c8a7.ext2 | `-- j.ext1.ext2 |-- c.ext^Mnewline | |-- f | `-- g.with[or].ext `-- f^Jnewline.ext 4 directories, 9 files </pre> <h3>Result</h3> <pre> $ tree -a a a |-- .hidden_dir | `-- foo |-- b | `-- c.d | |-- f.d41d8cd98f00b204e9800998ecf8427e | |-- g.d41d8cd98f00b204e9800998ecf8427e.ext | |-- h.d41d8cd98f00b204e9800998ecf8427e | |-- i.ext1.d41d8cd98f00b204e9800998ecf8427e.ext2 | `-- j.ext1.d41d8cd98f00b204e9800998ecf8427e.ext2 |-- c.ext^Mnewline | |-- f.d41d8cd98f00b204e9800998ecf8427e | `-- g.with[or].d41d8cd98f00b204e9800998ecf8427e.ext `-- f^Jnewline.d3b07384d113edec49eaa6238ad5ff00.ext 4 directories, 9 files </pre>

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