4.3BSD-UWisc/man/cat1/cpio.1

CPIO(1)             UNIX Programmer's Manual              CPIO(1)



NAME
     cpio - copy file archives in and out

SYNOPSIS
     cpio -o [ acBv ]

     cpio -i [ BcdmrtuvfsSb6 ] [ patterns ]

     cpio -p [ adlmruv ] directory

DESCRIPTION
     Cpio -o (copy out) reads the standard input to obtain a list
     of path names and copies those files onto the standard out-
     put together with path name and status information.

     Cpio -i (copy in) extracts files from the standard input
     which is assumed to be the product of a previous cpio -o.
     Only files with names that match _p_a_t_t_e_r_n_s are selected.
     _P_a_t_t_e_r_n_s are given in the name-generating notation of _s_h(1).
     In _p_a_t_t_e_r_n_s, meta-characters ?, *, and [...] match the slash
     / character.  Multiple _p_a_t_t_e_r_n_s may be specified and if no
     _p_a_t_t_e_r_n_s are specified, the default for _p_a_t_t_e_r_n_s is * (i.e.,
     select all files).  The extracted files are conditionally
     created and copied into the current directory tree based
     upon the options described below.

     Cpio -p (pass) reads the standard input to obtain a list of
     path names of files that are conditionally created and
     copied into the destination _d_i_r_e_c_t_o_r_y tree based upon the
     options described below.

     The meanings of the available options are:

     a    Reset access times of input files after they have been
          copied.
     B    Input/output is to be blocked 5,120 bytes to the record
          (does not apply to the _p_a_s_s option; meaningful only
          with data directed to or from /dev/rmt?).
     d    _D_i_r_e_c_t_o_r_i_e_s are to be created as needed.
     c    Write _h_e_a_d_e_r information in ASCII character form for
          portability.
     r    Interactively _r_e_n_a_m_e files.  If the user types a null
          line, the file is skipped.
     t    Print a _t_a_b_l_e _o_f _c_o_n_t_e_n_t_s of the input.  No files are
          created.
     u    Copy _u_n_c_o_n_d_i_t_i_o_n_a_l_l_y (normally, an older file will not
          replace a newer file with the same name).
     v    _V_e_r_b_o_s_e: causes a list of file names to be printed.
          When used with the t option, the table of contents
          looks like the output of an ls -l command (see _l_s(1)).
     l    Whenever possible, link files rather than copying them.
          Usable only with the -p option.



Printed 12/27/86                                                1






CPIO(1)             UNIX Programmer's Manual              CPIO(1)



     m    Retain previous file modification time.  This option is
          ineffective on directories that are being copied.
     f    Copy in all files except those in _p_a_t_t_e_r_n_s.
     s    Swap bytes.  Use only with the -i option.
     S    Swap halfwords.  Use only with the -i option.
     b    Swap both bytes and halfwords.  Use only with the -i
          option.
     6    Process an old (i.e., UNIX System _S_i_x_t_h Edition format)
          file.  Only useful with -i (copy in).

EXAMPLES
     The first example below copies the contents of a directory
     into an archive; the second duplicates a directory hierar-
     chy:

          ls | cpio -o >/dev/mt0

          cd olddir
          find . -depth -print | cpio -pdl newdir

     The trivial case ``find . -depth -print | cpio -oB
     >/dev/rmt0'' can be handled more efficiently by:

          find . -cpio /dev/rmt0

SEE ALSO
     ar(1), find(1), cpio(4).

BUGS
     Path names are restricted to 128 characters.  If there are
     too many unique linked files, the program runs out of memory
     to keep track of them and, thereafter, linking information
     is lost.  Only the super-user can copy special files.  The
     -B option does not work with certain magnetic tape drives
     (see _u_n_3_2(7) in the _U_N_I_X _S_y_s_t_e_m _A_d_m_i_n_i_s_t_r_a_t_o_r'_s _M_a_n_u_a_l).




















Printed 12/27/86                                                2