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- DD(1L) DD(1L)
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- NNAAMMEE
- dd - convert a file while copying it
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- SSYYNNOOPPSSIISS
- dddd [--help] [--version] [if=file] [of=file] [ibs=bytes]
- [obs=bytes] [bs=bytes] [cbs=bytes] [skip=blocks]
- [seek=blocks] [count=blocks]
- [conv={ascii,ebcdic,ibm,block,unblock,lcase,ucase,swab,noerror,notrunc,
- sync}]
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- DDEESSCCRRIIPPTTIIOONN
- This manual page documents the GNU version of dddd. dddd
- copies a file (from the standard input to the standard
- output, by default) with a user-selectable blocksize,
- while optionally performing conversions on it.
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- OOPPTTIIOONNSS
- Numbers can be followed by a multiplier:
- b=512, k=1024, w=2, xm=number m
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- _-_-_h_e_l_p Print a usage message and exit with a non-zero sta-
- tus.
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- _-_-_v_e_r_s_i_o_n
- Print version information on standard error then
- exit.
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- _i_f_=_f_i_l_e
- Read from _f_i_l_e instead of the standard input.
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- _o_f_=_f_i_l_e
- Write to _f_i_l_e instead of the standard output.
- Unless _c_o_n_v_=_n_o_t_r_u_n_c is given, truncate _f_i_l_e to the
- size specified by _s_e_e_k_= (0 bytes if _s_e_e_k_= is not
- given).
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- _i_b_s_=_b_y_t_e_s
- Read _b_y_t_e_s bytes at a time.
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- _o_b_s_=_b_y_t_e_s
- Write _b_y_t_e_s bytes at a time.
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- _b_s_=_b_y_t_e_s
- Read and write _b_y_t_e_s bytes at atime. Override ibs
- and obs.
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- _c_b_s_=_b_y_t_e_s
- Convert _b_y_t_e_s bytes at a time.
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- _s_k_i_p_=_b_l_o_c_k_s
- Skip _b_l_o_c_k_s ibs-sized blocks at start of input.
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- _s_e_e_k_=_b_l_o_c_k_s
- Skip _b_l_o_c_k_s obs-sized blocks at start of output.
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- FSF GNU File Utilities 1
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- DD(1L) DD(1L)
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- _c_o_u_n_t_=_b_l_o_c_k_s
- Copy only _b_l_o_c_k_s ibs-sized input blocks.
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- _c_o_n_v_=_c_o_n_v_e_r_s_i_o_n_[_,_c_o_n_v_e_r_s_i_o_n_._._._]
- Convert the file as specified by the _c_o_n_v_e_r_s_i_o_n
- arguments.
- Conversions:
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- ascii Convert EBCDIC to ASCII.
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- ebcdic Convert ASCII to EBCDIC.
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- ibm Convert ASCII to alternate EBCDIC.
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- block Pad newline-terminated records to size of
- cbs, replacing newline with trailing spaces.
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- unblock
- Replace trailing spaces in cbs-sized block
- with newline.
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- lcase Change uppercase characters to lowercase.
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- ucase Change lowercase characters to uppercase.
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- swab Swap every pair of input bytes. Unlike the
- Unix dd, this works when an odd number of
- bytes are read. If the input file contains
- an odd number of bytes, the last byte is
- simply copied (since there is nothing to
- swap it with).
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- noerror
- Continue after read errors.
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- notrunc
- Do not truncate the output file.
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- sync Pad every input block to size of ibs with
- trailing NULs.
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- FSF GNU File Utilities 2
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