Redirect all output to file using Bash on Linux

Question

I am trying to redirect all output from a command line programme to a file   I am using Bash   Some of the output is directed to a the file  but some still appears in the terminal and is not stored to the file     Similar symptoms are described here   Redirect all output to file  However I have tried the proposed solution  capture stderr  without success    lt cmd gt   lt args gt   gt  stdout txt 2 gt  stderr txt   The file stderr txt is created but is empty   A possible clue is that the command-line programme is a client communicating with a server on the same machine   It may be that some of the output is coming from the server     Is there a way to capture all the output from the terminal  irrespective of its origin   EDIT   I ve confirmed that the missing output is generated by the server   Running the command in a separate terminal causes some output in both terminals  I can pipe all the output from the command terminal to a file   This raises issues about how to capture the server output  but that s a different question

User · Accepted Answer

If the server is started on the same terminal, then it's the server's stderr that is presumably being written to the terminal and which you are not capturing.

The best way to capture everything would be to run:

script output.txt

before starting up either the server or the client. This will launch a new shell with all terminal output redirected out output.txt as well as the terminal. Then start the server from within that new shell, and then the client. Everything that you see on the screen (both your input and the output of everything writing to the terminal from within that shell) will be written to the file.

When you are done, type "exit" to exit the shell run by the script command.

User · Answer

Proper answer is here  http   scratching psybermonkey net 2011 02 ssh-how-to-pipe-output-from-local-to html  your command   ssh username server  cat  gt  filename txt

User · Answer

I had trouble with a crashing program  cough PHP cough  Upon crash the shell it was ran in reports the crash reason  Segmentation fault  core dumped   To avoid this output not getting logged  the command can be run in a subshell that will capture and direct these kind of output   sh -c  your command   gt  your stdout log 2 gt  your stderr err   or sh -c  your command   gt  your stdout log 2 gt  amp 1

User · Answer

you can use this syntax to redirect all output stderr and stdout to stdout txt    lt cmd gt   lt args gt   gt  allout txt 2 gt  amp 1

User · Answer

Though not POSIX  bash 4 has the  amp  gt  operator   command  amp  gt  alloutput txt

User · Answer

You can execute a subshell and redirect all output while still putting the process in the background       script sh blah  gt    log blah log 2 gt  amp 1    amp  echo     gt    pids blah pid

[linux] Redirect all output to file using Bash on Linux?

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