cstream 介绍
cstream 是一个类似 Linux 下的 dd 工具，用来处理数据流的工具。
cstream by Martin Cracauer - version 3.0.0
-V = print version number to stdout and exit with 0
-v <n> = verbose [default: off]
0 = nothing
1 = report bytes transferred and throughput
2 = also throughput after first read/write
3 = also seperate throughput for read and write (unimplemented)
3 = verbose stats on every read/write
-b <n> = blocksize [default: 8192]
-B <n> = buffer (at most) <n> bytes [default: one block]
-c <n> = Concurrency, writing done by a seperate process
0 = no concurrency, one one process
1 = read side buffers
2 = write side buffers
3 = both sides buffer, -B amount of data will be transferred at once
-n <n> = overall size of data [default: unlimited]
-t <n> = throughput in bytes/sec [default: unlimited]
if positive, bandwith is average over whole session.
if negative, every write is delayed to not excceed.
-i <s> = name of input file, - = generate stream yourself
to use stdin, use -i ''
-o <s> = name of output file, - = just sink data
to use stdout, -o ''
-I <s> = Type of input file
-O <s> = Type of ouput file
'f' = fifo (create it)
'a' = set audio modes on file (i.e. CD quality)
'N' = don't use TCP even if filename has ':'
't' = tee - in addition to outfile, copy stream to fd 3
'D' = O_DIRECT
'S' = O_SYNC
[Multiple chars allowed]
-p <s> = Write pid as ascii integer to file <s>
-l include line count in statistics
-w <n> = Set write block size (-c 5 only)
-S Don't output statistic on SIGINFO
-T <n> = Report throughput every <n> seconds
SIGINFO causes statistics to be written to stderr
SIGUSR1 causes statistics to be written to stderr
SIGUSR2 causes loop end after next buffer transfer
<file> if -i has not been used, specifies input file
-6 <n> Use IPV6: -1 = don't, 1 = allow both, 2 = force v6
On some platforms server mode 1 forces ipv6, as
they don't open both v4 and v6 ports from one bind call.
cstream 官网
http://www.cons.org/cracauer/cstream.html
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