Redirect all output to file in Bash

Question

I know that in Linux  to redirect output from the screen to a file  I can either use the  gt  or tee  However  I m not sure why part of the output is still output to the screen and not written to the file    Is there a way to redirect all output to file

User · Answer

Command   foo  gt  gt  output txt 2 gt  amp 1   appends to the output txt file  without replacing the content

User · Answer

It might be the standard error  You can redirect it       gt  out txt 2 gt  amp 1

User · Answer

All POSIX operating systems have 3 streams  stdin  stdout  and stderr  stdin is the input  which can accept the stdout or stderr  stdout is the primary output  which is redirected with  gt    gt  gt   or    stderr is the error output  which is handled separately so that any exceptions do not get passed to a command or written to a file that it might break  normally  this is sent to a log of some kind  or dumped directly  even when the stdout is redirected  To redirect both to the same place  use   command  amp    some file  EDIT  thanks to Zack for pointing out that the above solution is not portable--use instead        command   gt  file 2 gt  amp 1    If you want to silence the error  do    command  2 gt   dev null

User · Answer

That part is written to stderr  use 2 gt  to redirect it  For example   foo  gt  stdout txt 2 gt  stderr txt   or if you want in same file   foo  gt  allout txt 2 gt  amp 1   Note  this works in  ba sh  check your shell for proper syntax

User · Answer

To get the output on the console AND in a file file txt for example   make 2 gt  amp 1   tee file txt   Note   amp   in 2 gt  amp 1  specifies that 1 is not a file name but a file descriptor

User · Answer

You can use exec command to redirect all stdout stderr output of any commands later   sample script   exec 2 gt  your file2  gt  your file1 your other commands

User · Answer

Use  gt  gt  to append   command  gt  gt  file

User · Answer

Use this -  require command here   gt  log file name 2 gt  amp 1  Detail description of redirection operator in Unix Linux   The   operator redirects the output usually to a file but it can be to a device  You can also use    to append   If you don t specify a number then the standard output stream is assumed but you can also redirect errors   gt  file redirects stdout to file 1 gt  file redirects stdout to file 2 gt  file redirects stderr to file  amp  gt  file redirects stdout and stderr to file    dev null is the null device it takes any input you want and throws it away  It can be used to suppress any output

User · Answer

Credits to osexp2003 and j a         Instead of putting    amp  gt  gt  your file log   behind a line in   crontab -e   I use      bin bash exec  amp  gt  gt  your file log       at the beginning of a BASH script   Advantage  You have the log definitions within your script  Good for Git etc

[linux] Redirect all output to file in Bash

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