Save Screen program output to a file

Question

I need to save the whole output of Screen to a file to check later all the content   The reason is that I m dumping a flash memory through a serial port  using Screen to interface with it  I would like to save it to a file to check memory structure   I ve tried      screen  dev ttyUSB0 115200  gt  gt  foo txt    screen  dev ttyUSB0 115200   tee foo txt   And I ve also tried to use bufferfile from screen  but I don t understand how to use it   Is there an easy way

User · Accepted Answer

There is a command line option for logging. The output is saved to screenlog.n file, where n is a number of the screen. From man pages of screen:

‘-L’ Tell screen to turn on automatic output logging for the windows.

User · Answer

The selected answer doesn t work quite well with multiple sessions and doesn t allow to specify a custom log file name   For multiple screen sessions  this is my formula    Create a configuration file for each process   logfile test log logfile flush 1 log on logtstamp after 1 logtstamp string     t   Y- m- d  c  s   012  logtstamp on   If you want to do it  on the fly   you can change logfile automatically   012 means  new line   as using  n will print it on the log file  source  Start your command with the  -c  and  -L  flags   screen -c   test conf -dmSL  Test    test pl   That s it  You will see  test log  after the first flush       6 Something is happening      test pl  2016-06-01 13 02 53   7 Something else      test pl  2016-06-01 13 02 54   8 Nothing here   test pl  2016-06-01 13 02 55   9 Something is happening      test pl  2016-06-01 13 02 56   10 Something else      test pl  2016-06-01 13 02 57   11 Nothing here   test pl  2016-06-01 13 02 58          I found that  -L  is still required even when  log on  is on the configuration file   I couldn t find a list of the time format variables  like  m  used by screen  If you have a link of those formats  please post it bellow   Extra  In case you want to do it  on the fly   you can use this script      bin bash if     2           then     echo  Usage   0 name command       exit 1  fi name  1 command  2 path   var log   config  logfile   path    name  log logfile flush 1 log on logtstamp after 1 logtstamp string      t   Y- m- d  c  s   012   logtstamp on   echo   config   gt   tmp log conf screen -c  tmp log conf -dmSL   name   command rm  tmp log conf   To use it  save it  screen sh  and set  x permissions     screen sh TEST   test pl       and will execute   test pl and create a log file in  var log TEST log

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A different answer if you need to save the output of your whole scrollback buffer from an already actively running screen   Ctrl-a   g SPACE G    gt     This will save your whole buffer to  tmp screen-exchange

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Existing screen log can be saved by    Ctrl A   hardcopy -h filename

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For the Mac terminal   script -a -t 0 out txt screen  dev ttyUSB0 115200   Details   script  A built-in application to  make a typescript of terminal session  -a  Append to output file -t 0  Time between writing to output file is 0 seconds  so out txt is updated for every new character out txt  Is just the output file name screen  dev ttyUSB0 115200  Command from question for connecting to an external device   You can then use tail to see that the file is updating   tail -100 out txt

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Here s a trick  wrap it in sh -c   screen sh -c    some-script 2 gt  amp 1   tee mylog log    Where 2 gt  amp 1 redirects stderr to stdout so tee can catch and log error messages

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You can also use Control-a   H to save loggings into screenlog n file  One more Control-a   H to turn off   C-a H  Begins ends logging of the current window to the file  screenlog n

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The following command works for Screen version 4 06 02   screen -L -Logfile Log file name of your choice command to be executed   From the man page of Screen   -Logfile file   By default logfile name is  screenlog 0                   You can set new logfile name with the  -Logfile  option    You can check the existing version of Screen using screen -version  You can download and install the latest Screen version from https   www gnu org software screen

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Ctrl A then Shift H works for me  You can view the file screenlog 0 while the program is still running

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The following might be useful  tested on  Linux Ubuntu nbsp 12 04  Precise Pangolin     cat  dev ttyUSB0   Using the above  you can then do all the re-directions that you need  For example  to dump output to your console while saving to your file  you d do   cat  dev ttyUSB0   tee console log

User · Answer

The  script  command under Unix should do the trick  Just run it at the start of your new console and you should be good

[logging] Save Screen (program) output to a file

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