Unix Commands to check a file is compressed or not? Post: 302350641

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LEARN ABOUT CENTOS

archive_write_filter

ARCHIVE_WRITE_FILTER(3) 				   BSD Library Functions Manual 				   ARCHIVE_WRITE_FILTER(3)

NAME

     archive_write_add_filter_bzip2, archive_write_add_filter_compress, archive_write_add_filter_gzip, archive_write_add_filter_lzip,
     archive_write_add_filter_lzma, archive_write_add_filter_none, archive_write_add_filter_program, archive_write_add_filter_xz

LIBRARY

     Streaming Archive Library (libarchive, -larchive)

SYNOPSIS

     #include <archive.h>

     int
     archive_write_add_filter_bzip2(struct archive *);

     int
     archive_write_add_filter_compress(struct archive *);

     int
     archive_write_add_filter_gzip(struct archive *);

     int
     archive_write_add_filter_lzip(struct archive *);

     int
     archive_write_add_filter_lzma(struct archive *);

     int
     archive_write_add_filter_none(struct archive *);

     int
     archive_write_add_filter_program(struct archive *, const char * cmd);

     int
     archive_write_add_filter_xz(struct archive *);

DESCRIPTION

     archive_write_add_filter_bzip2(), archive_write_add_filter_compress(), archive_write_add_filter_gzip(), archive_write_add_filter_lzip(),
	     archive_write_add_filter_lzma(), archive_write_add_filter_xz(),
	     The resulting archive will be compressed as specified.  Note that the compressed output is always properly blocked.

     archive_write_add_filter_none()
	     This is never necessary.  It is provided only for backwards compatibility.

     archive_write_add_filter_program()
	     The archive will be fed into the specified compression program.  The output of that program is blocked and written to the client
	     write callbacks.

RETURN VALUES

     These functions return ARCHIVE_OK on success, or ARCHIVE_FATAL.

ERRORS

     Detailed error codes and textual descriptions are available from the archive_errno() and archive_error_string() functions.

SEE ALSO

     tar(1), libarchive(3), archive_write(3), archive_write_format(3), archive_write_set_options(3), cpio(5), mtree(5), tar(5)

BSD
								 February 2, 2012							       BSD

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check to see if a file is compressed before trying to compress

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