如果ddrescue将其stdout / stderr重定向到管道时仍不更改其输出，则可以使用tee实用程序在终端上显示输出并将其保存到文件中：
$ ddrescue input_path output_path ddrescue_logfile |& tee logfile
如果确实如此，那么您可以尝试使用script实用程序提供一个伪tty ：
$ script -c 'ddrescue input_path output_path ddrescue_logfile' -q logfile
如果它直接写入终端，则可以screen用来捕获输出：
$ screen -L -- ddrescue input_path output_path ddrescue_logfile
要tee在Python中模拟基于命令的命令而不调用tee实用程序：
#!/usr/bin/env python3
import shlex
import sys
from subprocess import Popen, PIPE, STDOUT
command = 'ddrescue input_path output_path ddrescue_logfile'
with Popen(shlex.split(command), stdout=PIPE, stderr=STDOUT, bufsize=1) as p:
with open('logfile', 'wb') as logfile:
for line in p.stdout:
logfile.write(line)
sys.stdout.buffer.write(line)
sys.stdout.buffer.flush()
tee使用shell=True以下命令在Python中调用基于命令：
#!/usr/bin/env python
from pipes import quote
from subprocess import call
files = input_path, output_path, ddrescue_logfile
rc = call('ddrescue {} | tee -a drclog'.format(' '.join(map(quote, files))),
shell=True)
要模拟script基于命令：
#!/usr/bin/env python3
import os
import shlex
import pty
logfile = open('logfile', 'wb')
def read(fd):
data = os.read(fd, 1024) # doesn't block, it may return less
logfile.write(data) # it can block but usually not for long
return data
command = 'ddrescue input_path output_path ddrescue_logfile'
status = pty.spawn(shlex.split(command), read)
logfile.close()
要screen在Python中调用命令：
#!/usr/bin/env python3
import os
import shlex
from subprocess import check_call
screen_cmd = 'screen -L -- ddrescue input_path output_path ddrescue_logfile'
check_call(shlex.split(screen_cmd))
os.replace('screenlog.0', 'logfile')
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