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To redirect standard output to a truncated file in Bash, I know to use:
cmd > file.txt To redirect standard output in Bash, appending to a file, I know to use:
cmd >> file.txt To redirect both standard output and standard error to a truncated file, I know to use:
cmd &> file.txt How do I redirect both standard output and standard error appending to a file? cmd &>> file.txt did not work for me.
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Understanding the concept of redirections and file descriptors is very important when working on the command line. To redirect stderr and stdout , use the 2>&1 or &> constructs.
Discussion. &> or >& is a shortcut that simply sends both STDOUT and STDERR to the same place—exactly what we want to do.
How to redirect standard error and standard output in bash. You can send both stdout and stderr to a file named output.txt. command &>output.xt. find / -name "*.pl" &>filelist.txt. Please note that both errors and actual output of the find command stored into a file: cat filelist.txt.
To redirect stderr (standard error) to a file: To redirect both stderr and stdout (standard output): You must replace command with the command you want to run. Let us see some examples that explains redirection of standard error in bash.
1 To redirect standard output and standard error to the same file, use the following command syntax. ... 2 A slightly easier way to achieve this functionality is with the &> operator. ... 3 To append standard output and standard error to a file that already exists, use the same syntax above, but with the >> redirection operator. ... More items...
#Redirect standard output to the file app.log Standard redirection is done with a single >. This will replace the file each time your restart your script. Two > will append to the file. #Redirect error output to the file err.log Our test python script foo.py: Error is accessible with 2 while standard output is 1, so you can redirect error with:
cmd >>file.txt 2>&1 Bash executes the redirects from left to right as follows:
>>file.txt: Open file.txt in append mode and redirect stdout there.2>&1: Redirect stderr to "where stdout is currently going". In this case, that is a file opened in append mode. In other words, the &1 reuses the file descriptor which stdout currently uses.
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