linux - within - shell script redirect output to file




Redirect all output to file (7)

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 >, >>, 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 &> /some/file

EDIT: thanks to Zack for pointing out that the above solution is not portable--use instead:

*command* > file 2>&1 

If you want to silence the error, do:

*command* 2> /dev/null

This question already has an answer here:

I know that in Linux, to redirect output from the screen to a file, I can either use the > 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?


Command:

foo >> output.txt 2>&1

appends to the output.txt file, without replacing the content.


In Linux Mint, this command string routed executing script and errors to a single txt file. bash -x ./setup.sh > setup.txt 2>&1. Script name was setup.sh and output destination was setup.txt.


It might be the the standard error. You can redirect it:

... > out.txt 2>&1

To get the output on the console AND in a file file.txt for example.

make 2>&1 | tee file.txt

Note: & (in 2>&1) specifies that 1 is not a file name but a file descriptor.


Use >> to append:

command >> file


You can use exec command to redirect all stdout/stderr output of any commands later.

sample script:

exec 2> your_file2 > your_file1
your other commands.....




io-redirection