Appending output of a Batch file To log file

Question

I have a batch file which calls a java program   The output is redirected to a log file in the same directory  However the log file is replaced everytime the batch file is run     I would like to keep the old outputs in the log file and always append the new output to the log file

User · Answer

This is not an answer to your original question   Appending output of a Batch file To log file    For reference  it s an answer to your followup question   What lines should i add to my batch file which will make it execute after every 30mins     But I would take Jon Skeet s advice   You probably shouldn t do that in your batch file - instead  use Task Scheduler     Timeout    timeout command 1 timeout command 2   Example  1 second    TIMEOUT  T 1000  NOBREAK  Sleep    sleep command  if sleep exe is installed    Example  1 second    sleep -m 1000  Alternative methods    Sleeping in a batch file batch script  put to sleep until certain time   Here s an answer to your 2nd followup question   Along with the Timestamp    Create a date and time stamp in your batch files  Example   echo     Date   DATE   -  and Time  TIME   -       gt  gt  output log

User · Answer

It s also possible to use java Foo   tee -a some log  it just prints to stdout as well  Like   user at Computer in     echo  hi    tee -a foo txt hi  user at Computer in     echo  hello    tee -a foo txt hello  user at Computer in     cat foo txt hi hello

User · Answer

Use log4j in your java program instead   Then you can output to multiple media  create rolling logs  etc  and include timestamps  class names and line numbers

User · Answer

Instead of using     to redirect like this   java Foo  gt  log   use      to append normal  stdout  output to a new or existing file   java Foo  gt  gt  log   However  if you also want to capture  stderr  errors  such as why the Java program couldn t be started   you should also use the  2  amp 1  tag which redirects  stderr   the  2   to  stdout   the  1     For example   java Foo  gt  gt  log 2 gt  amp 1

[batch-file] Appending output of a Batch file To log file

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