将python输出馈送到whiptail

man whiptail 说:

--仪表文本高度宽度百分比

          A gauge box displays a meter along the bottom of the
          box.  The meter indicates a percentage.  New percentages
          are read from standard input, one integer per line.  The
          meter is updated to reflect each new percentage.  If
          stdin is XXX, the first following line is a percentage
          and subsequent lines up to another XXX are used for a
          new prompt.  The gauge exits when EOF is reached on
          stdin.

这意味着 whiptail 读取自 standard input . 许多程序 通常在输出不到文件时缓冲输出。强制 python 要产生无缓冲输出,您可以:

• 使用运行它 unbuffer :

  $ unbuffer ./data-gen.py | whiptail --title "TEST" --gauge "GAUGE" 0 50 0
  

• 使用 -u 打开命令行:

  $ python -u ./data-gen.py | whiptail --title "TEST" --gauge "GAUGE" 0 50 0
  

• 修改的shebang data-gen.py :

  #!/usr/bin/python -u
  import time
  print 10
  time.sleep(1)
  print 20
  time.sleep(1)
  print 100
  time.sleep(1)
  

• 每次之后手动冲洗标准液 print :

  #!/usr/bin/python
  import time
  import sys
  
  print 10
  sys.stdout.flush()
  time.sleep(1)
  print 20
  sys.stdout.flush()
  time.sleep(1)
  print 100
  sys.stdout.flush()
  time.sleep(1)
  

• 设置 PYTHONUNBUFFERED 环境变量:

  $ PYTHONUNBUFFERED=1 ./data-gen.py | whiptail --title "TEST" --gauge "GAUGE" 0 50 0