Convert line-endings for whole directory tree (Git)

dos2unix does that for you. Fairly straight forward process.
dos2unix filename

Thanks to toolbear, here is a one-liner that recursively replaces line endings and properly handles whitespace, quotes, and shell meta chars.

find . -type f -exec dos2unix {} \;

If you're using dos2unix 6.0 binary files will be ignored.

Assuming you have GNU grep and perl this will recursively convert CRLF to LF in non-binary files under the current directory:

find . -type f -exec grep -qIP '\r\n' {} ';' -exec perl -pi -e 's/\r\n/\n/g' {} '+'

How it Works

Find recursively under current directory; change . to blog or whatev subdirectories to limit the replacement:

find .

Only match regular files:

  -type f

Test if file contains CRLF. Exclude binary files. Runs grep command for every regular file. That's the price of excluding binaries. If you have an old grep you could try building a test using the file command:

  -exec grep -qIP '\r\n' {} ';'

Replace CRLF with LF. The '+' with the second -exec tells find to accumulate matching files and pass them to one (or as few as possible) invocations of the command -- like piping to xargs, but without problems if file path contains spaces, quotes, or other shell meta characters. The i in -pi tells perl to modify the file in place. You could use sed or awk here with some work, and you'll probably change '+' to ';' and invoke a separate process for each match:

  -exec perl -pi -e 's/\r\n/\n/g' {} '+'

Here's a better option: Swiss File Knife. It works recursively across sub-directories, and handles properly spaces and special characters.

All you have to do is:

sfk remcr -dir your_project_directory

Bonus: sfk also does lots of other conversions. See below for the full list:

SFK - The Swiss File Knife File Tree Processor.Release 1.6.7 Base Revision 2 of May  3 2013.StahlWorks Technologies, http://stahlworks.com/Distributed for free under the BSD License, without any warranty.type "sfk commandname" for help on any of the following.some commands require to add "-help" for the help text.   file system      sfk list       - list directory tree contents.                       list latest, oldest or biggest files.                       list directory differences.                       list zip jar tar gz bz2 contents.      sfk filefind   - find files by filename      sfk treesize   - show directory size statistics      sfk copy       - copy directory trees additively      sfk sync       - mirror tree content with deletion      sfk partcopy   - copy part from a file into another one      sfk mkdir      - create directory tree      sfk delete     - delete files and folders      sfk deltree    - delete whole directory tree      sfk deblank    - remove blanks in filenames      sfk space [-h] - tell total and free size of volume      sfk filetime   - tell times of a file      sfk touch      - change times of a file   conversion      sfk lf-to-crlf - convert from LF to CRLF line endings      sfk crlf-to-lf - convert from CRLF to LF line endings      sfk detab      - convert TAB characters to spaces      sfk entab      - convert groups of spaces to TAB chars      sfk scantab    - list files containing TAB characters      sfk split      - split large files into smaller ones      sfk join       - join small files into a large one      sfk hexdump    - create hexdump from a binary file      sfk hextobin   - convert hex data to binary      sfk hex        - convert decimal number(s) to hex      sfk dec        - convert hex number(s) to decimal      sfk chars      - print chars for a list of codes      sfk bin-to-src - convert binary to source code   text processing      sfk filter     - search, filter and replace text data      sfk addhead    - insert string at start of text lines      sfk addtail    - append string at end of text lines      sfk patch      - change text files through a script      sfk snapto     - join many text files into one file      sfk joinlines  - join text lines split by email reformatting      sfk inst       - instrument c++ sourcecode with tracing calls      sfk replace    - replace words in binary and text files      sfk hexfind    - find words in binary files, showing hexdump      sfk run        - run command on all files of a folder      sfk runloop    - run a command n times in a loop      sfk printloop  - print some text many times      sfk strings    - extract strings from a binary file      sfk sort       - sort text lines produced by another command      sfk count      - count text lines, filter identical lines      sfk head       - print first lines of a file      sfk tail       - print last lines of a file      sfk linelen    - tell length of string(s)   search and compare      sfk find       - find words in binary files, showing text      sfk md5gento   - create list of md5 checksums over files      sfk md5check   - verify list of md5 checksums over files      sfk md5        - calc md5 over a file, compare two files      sfk pathfind   - search PATH for location of a command      sfk reflist    - list fuzzy references between files      sfk deplist    - list fuzzy dependencies between files      sfk dupfind    - find duplicate files by content   networking      sfk httpserv   - run an instant HTTP server.                       type "sfk httpserv -help" for help.      sfk ftpserv    - run an instant FTP server                       type "sfk ftpserv -help" for help.      sfk ftp        - instant anonymous FTP client      sfk wget       - download HTTP file from the web      sfk webrequest - send HTTP request to a server      sfk tcpdump    - print TCP conversation between programs      sfk udpdump    - print incoming UDP requests      sfk udpsend    - send UDP requests      sfk ip         - tell own machine's IP address(es).                       type "sfk ip -help" for help.      sfk netlog     - send text outputs to network,                       and/or file, and/or terminal   scripting      sfk script     - run many sfk commands in a script file      sfk echo       - print (coloured) text to terminal      sfk color      - change text color of terminal      sfk alias      - create command from other commands      sfk mkcd       - create command to reenter directory      sfk sleep      - delay execution for milliseconds      sfk pause      - wait for user input      sfk label      - define starting point for a script      sfk tee        - split command output in two streams      sfk tofile     - save command output to a file      sfk toterm     - flush command output to terminal      sfk loop       - repeat execution of a command chain      sfk cd         - change directory within a script      sfk getcwd     - print the current working directory      sfk require    - compare version text   development      sfk bin-to-src - convert binary data to source code      sfk make-random-file - create file with random data      sfk fuzz       - change file at random, for testing      sfk sample     - print example code for programming      sfk inst       - instrument c++ with tracing calls   diverse      sfk media      - cut video and binary files      sfk view       - show results in a GUI tool      sfk toclip     - copy command output to clipboard      sfk fromclip   - read text from clipboard      sfk list       - show directory tree contents      sfk env        - search environment variables      sfk version    - show version of a binary file      sfk ascii      - list ISO 8859-1 ASCII characters      sfk ascii -dos - list OEM codepage 850 characters      sfk license    - print the SFK license text   help by subject      sfk help select   - how dirs and files are selected in sfk      sfk help options  - general options reference      sfk help patterns - wildcards and text patterns within sfk      sfk help chain    - how to combine (chain) multiple commands      sfk help shell    - how to optimize the windows command prompt      sfk help unicode  - about unicode file reading support      sfk help colors   - how to change result colors      sfk help xe       - for infos on sfk extended edition.   All tree walking commands support file selection this way:   1. short format with ONE directory tree and MANY file name patterns:      src1dir .cpp .hpp .xml bigbar !footmp   2. short format with a list of explicite file names:      letter1.txt revenues9.xls report3\turnover5.ppt   3. long format with MANY dir trees and file masks PER dir tree:      -dir src1 src2 !src\save -file foosys .cpp -dir bin5 -file .exe   For detailed help on file selection, type "sfk help select".   * and ? wildcards are supported within filenames. "foo" is interpreted   as "*foo*", so you can leave out * completely to search a part of a name.   For name start comparison, say "\foo" (finds foo.txt but not anyfoo.txt).   When you supply a directory name, by default this means "take all files".      sfk list mydir                lists ALL  files of mydir, no * needed.      sfk list mydir .cpp .hpp      lists SOME files of mydir, by extension.      sfk list mydir !.cfg          lists all  files of mydir  EXCEPT .cfg   general options:      -tracesel tells in detail which files and/or directories are included                or excluded, and why (due to which user-supplied mask).      -nosub    do not process files within subdirectories.      -nocol    before any command switches off color output.      -quiet    or -nohead shows less output on some commands.      -hidden   includes hidden and system files and dirs.      For detailed help on all options, type "sfk help options".   beware of Shell Command Characters.      command parameters containing characters < > | ! & must be sur-      rounded by quotes "". type "sfk filter" for details and examples.   type "sfk ask word1 word2 ..."   to search ALL help text for words.   type "sfk dumphelp"              to print  ALL help text.

EDIT: a word of caution: be careful when running this on folders that have binary files, as it will effectively destroy your files, particularly .git directories. If this is your case, do not run sfk in the entire folder, but select specific file extensions instead (*.rb, *.py, etc). Example: sfk remcr -dir chef -file .rb -file .json -file .erb -file .md