DD's command

dd： Copy a file in a block of a specified size , And perform the specified transformation at the same time of copying

Be careful ： The place where the number is specified ends with the following characters , Multiply by the corresponding number ：b=512;c=1;k=1024;w=2

Parameters		explain
if	file name	Input file name , Default to standard input . That is, specify the source file .< if=input file >
of	file name	Output file name , Default to standard output . I.e. designated purpose document .< of=output file >
ibs	bytes	Read in at a time bytes Bytes , That is, to specify a block size of bytes Bytes
obs	bytes	One output bytes Bytes , That is, to specify a block size of bytes Bytes
bs	bytes	Also set read in / The output block size is bytes Bytes
cbs	bytes	One conversion bytes Bytes , That is, specify the conversion buffer size
skip	blocks	Skip from the beginning of the input file blocks Block and start copying
seek	blocks	Skip from the beginning of the output file blocks Block and start copying Be careful ： Usually only valid if the output file is disk or tape , That is, backup to disk or tape is valid
count	blocks	Just copy blocks Block , The size of the block is equal to ibs Number of bytes specified
conv	conversion	Convert the file with the specified parameters Parameters explain ascii transformation ebcdic by ascii ebcdic transformation ascii by ebcdic ibm transformation ascii by alternate ebcdic block Convert each line to a length of cbs, Fill in the insufficient part with space unblock Make each line the length of cbs, Fill in the insufficient part with space lcase Convert uppercase characters to lowercase characters ucase Convert lowercase characters to uppercase characters swab Exchange each pair of bytes of input noerror Don't stop when something goes wrong notrunc Do not truncate the output file sync Fill each input block to ibs Bytes , Empty the insufficient part （NUL） Character complement