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cloc - Count, and compute differences of, lines of source code and comments.


cloc [options] <FILE|DIR> ...


Count, or compute differences of, physical lines of source code in the given files (may be
archives such as compressed tarballs or zip files) and/or recursively below the given
directories. It is written entirely in Perl, using only modules from the standard


Input Options
To count standard input, use the special filename -.

This option is only needed if cloc is unable to figure out how to extract the contents
of the input file(s) by itself. Use CMD to extract binary archive files (e.g.:
.tar.gz, .zip, .Z). Use the literal '>FILE<' as a stand-in for the actual file(s) to
be extracted. For example, to count lines of code in the input files gcc-4.2.tar.gz
perl-5.8.8.tar.gz on Unix use:

--extract-with='gzip -dc >FILE< | tar xf -

or, if you have GNU tar:

--extract-with='tar zxf >FILE<'

and on Windows, use, for example:

--extract-with="\"c:\Program Files\WinZip\WinZip32.exe\" -e -o >FILE<

Take the list of file and/or directory names to process from FILE which has one
file/directory name per line. See also --exclude-list-file

Check binary files to see if they contain Unicode expanded ASCII text. This causes
performance to drop noticably.

Processing Options
Count .in files (as processed by GNU autoconf) of recognized languages.

Report results for every source file encountered.

Report results for every source file encountered in addition to reporting by language.

--diff SET1 SET2
Compute differences in code and comments between source file(s) of SET1 and SET2. The
inputs may be pairs of files, directories, or archives. Use --diff-alignment to
generate a list showing which file pairs where compared. See also --ignore-case,

--diff-timeout N
Ignore files which take more than N seconds to process. Default is 10 seconds.
(Large files with many repeated lines can cause Algorithm::Diff::sdiff() to take

[Unix only] Follow symbolic links to directories (sym links to files are always

Process all files that have a EXT extension with the counter for language LANG. For
example, to count all .f files with the Fortran 90 counter (which expects files to end
with .f90) instead of the default Fortran 77 counter, use:

--force-lang="Fortran 90",f

If EXT is omitted, every file will be counted with the LANG counter. This option can
be specified multiple times (but that is only useful when EXT is given each time). See
also --script-lang, --lang-no-ext.

Load language processing filters from FILE, then use these filters instead of the
built-in filters. Note: languages which map to the same file extension (for example:
MATLAB/Objective C/MUMPS; Pascal/PHP; Lisp/OpenCL) will be ignored as these require
additional processing that is not expressed in language definition files. Use
--read-lang-def to define new language filters without replacing built-in filters (see
also --write-lang-def).

Ignore horizontal white space when comparing files with --diff. See also

Ignore changes in case; consider upper- and lowercase letters equivalent when
comparing files with --diff. See also --ignore-whitespace.

Count files without extensions using the LANG counter. This option overrides internal
logic for files without extensions (where such files are checked against known
scripting languages by examining the first line for "#!"). See also --force-lang,

Skip files larger than "MB" megabytes when traversing directories. By default,
"MB"=100. cloc's memory requirement is roughly twenty times larger than the largest
file so running with files larger than 100 MB on a computer with less than 2 GB of
memory will cause problems. Note: this check does not apply to files explicitly
passed as command line arguments.

Process binary files in addition to text files. This is usually a bad idea and should
only be attempted with text files that have embedded binary data.

Load new language processing filters from FILE and merge them with those already known
to cloc. If FILE defines a language cloc already knows about, cloc's definition will
take precedence. Use --force-lang-def to over-ride cloc's definitions. (see also

Process all files that invoke "S" as a "#!" scripting language with the counter for
language LANG. For example, files that begin with "#!/usr/local/bin/perl5.8.8" will be
counted with the Perl counter by using


The language name is case insensitive but the name of the script language executable,
"S", must have the right case. This option can be specified multiple times. See also

Use DIR as the scratch directory instead of letting File::Temp chose the location.
Files written to this location are not removed at the end of the run (as they are with

Skip the file uniqueness check. This will give a performance boost at the expense of
counting files with identical contents multiple times (if such duplicates exist).

Count lines streamed via STDIN as if they came from a file named FILE.

For each file processed, write to the current directory a version of the file which
has blank lines and comments removed. The name of each stripped file is the original
file name with ".EXT" appended to it. It is written to the current directory unless
--original-dir is on.

Write the stripped files the same directory as the original files. Only effective in
combination with --strip-comments.

Input arguments are report files previously created with the --report-file option.
Makes a cumulative set of results containing the sum of data from the individual
report files.

Over-ride the operating system detection logic and run in UNIX mode. See also
--windows, --show-os.

Over-ride the operating system detection logic and run in Microsoft Windows mode. See
also --unix, --show-os.

Filter Options
--exclude-dir=<dir[,<dir> ...]>
Exclude the given comma separated directories from being scanned. For example:


will skip all files that match "/.cache/" or "/test/" as part of their path.
Directories named ".bzr", ".cvs", ".hg", ".git", ".hg", and ".svn" are always

--exclude-ext=EXT1[,EXT2 ...]
Do not count files having the given file name extensions.

--exclude-lang=<L1[,<L2> ...]>
Exclude the given comma separated languages from being counted.

Ignore files whose names appear in FILE. FILE should have one entry per line. Relative
path names will be resolved starting from the directory where cloc is invoked. See
also --list-file.

Only count files in directories matching the Perl regex. For example


only counts files in directory paths containing "/src/" or "/include/".

Count all files except in directories matching the Perl regex.

Only count files whose basenames match the Perl regex. For example this only counts
files at start with Widget or widget:


Count all files except those whose basenames match the Perl regex.

Ignore files that end with the given Perl regular expression. For example, if given
--skip-archive='(zip|tar(\.(gz|Z|bz2|xz|7z))?)' the code will skip files that end
with .zip, .tar, .tar.gz, .tar.Z, .tar.bz2, .tar.xz, and .tar.7z.

On Windows, ignore hidden files.

Debug Options
Save names of categorized files to FILE.

Save names of processed source files to FILE.

Write to FILE a list of files and file pairs showing which files were added, removed,
and/or compared during a run with --diff. This switch forces the --diff mode on.

Print this usage information and exit.

Save names of every file found to FILE.

Save names of ignored files and the reason they were ignored to FILE.

Print to STDOUT processed source code before and after each filter is applied.

Print information about all known (or just the given) file extensions and exit.

Print information about all known (or just the given) languages and exit.

Print the value of the operating system mode and exit. See also --unix, --windows.

Turn on verbose with optional numeric value.

Print the version of this program and exit.

Writes to FILE the language processing filters then exits. Useful as a first step to
creating custom language definitions. See also --force-lang-def, --read-lang-def.

Output Options
--3 Print third-generation language output. (This option can cause report summation to
fail if some reports were produced with this option while others were produced without

Show progress update after every N files are processed (default N=100). Set N to 0 to
suppress progress output; useful when redirecting output to STDOUT.

Suppress all information messages except for the final report.

Write the results to FILE instead of standard output.

Synonym for --report-file=FILE.

Write the results as comma separated values.

Use the character C as the delimiter for comma separated files instead of ,. This
switch forces --csv to be on.

Write results as SQL CREATE and INSERT statements which can be read by a database
program such as SQLite. If FILE is -, output is sent to STDOUT.

Use <name> as the project identifier for the current run. Only valid with the --sql

Append SQL insert statements to the file specified by --sql and do not generate table
creation option.

For plain text reports, show the SUM: output line even if only one input file is

Write the results in XML.

Reference FILE as an XSL stylesheet within the XML output. If FILE is not given,
writes a default stylesheet, cloc.xsl. This switch forces --xml to be on.

Write the results in YAML.


Count the lines of code in the Perl 5.10.0 compressed tar file on a UNIX-like operating

cloc perl-5.10.0.tar.gz

Count the changes in files, code, and comments between Python releases 2.6.6 and 2.7:

cloc --diff Python-2.6.6.tar.bz Python-2.7.tar.bz2

To see how cloc aligns files for comparison between two code bases, use the
--diff-alignment=FILE option. Here the alignment information is written to "align.txt":

cloc --diff-aligment=align.txt gcc-4.4.0.tar.bz2 gcc-4.5.0.tar.bz2

Print the recognized languages

cloc --show-lang

Remove comments from "foo.c" and save the result in "foo.c.nc"

cloc --strip-comments=nc foo.c

Additional examples can be found at <http://cloc.sourceforge.net>.



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