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How to redirect both stdout and stderr to a file?
Please use command 2>file Here 2 stands for file descriptor of stderr. You can also use 1 instead of 2 so that stdout gets redirected to the ‘file’ Not the answer you’re looking for? Browse other questions tagged bash stdout io-redirection stderr or ask your own question.
How is stderr redirected in Bash Stack Overflow?
These will be used as real terminal STDOUT and STDERR. parens (sub-shell) executes ‘tee’ reading from exec’s STDOUT (pipe) and redirects to ‘logger’ command via another pipe to sub-shell in parens. At the same time it copies the same input to FD #3 (terminal)
What does stderr and stdout mean in Bash?
1 – stdout, the standard output stream. 2 – stderr, the standard error stream. A file descriptor is just a number representing an open file. The input stream provides information to the program, generally by typing in the keyboard.
How to redirect a command to a file in Bash?
When redirecting the output of a command to a file or piping it to another command, you might notice that the error messages are printed on the screen. In Bash and other Linux shells, when a program is executed, it uses three standard I/O streams. Each stream is represented by a numeric file descriptor:
What are the descriptors for stdout and stderr?
STDOUT and STDERR are just two files, represented by file descriptors, which are just integers, specifically 1 and 2. What you’re asking is to set descriptor 2 to /dev/null, then set descriptor 3 to the same file descriptor 2 and have that output go somewhere else.
How to redirect the output of a shell script?
While running shell scripts how we can redirect the output of shell scripts into two different files. i.e.STDOUT and STDERR files. If there is some error logs should go to STDERR file and if script successfully runs then logs should be generated under STDOUT file Replace echo “test” with any command or script.
How to redirect stdout and stderr to syslog?
What I have in my startup script is thie: This is redirecting the stdout to syslog just fine but stderr is coming to the console, so I need to refine the command. You need to combine the output of STDERR and STDOUT prior to piping it to logger. Try this instead: NOTE: This is equivalent to 2>&1 | .
Can you write both stderr and stdout at the same time?
You can write both stderr and stdout to two separate files: To suppress the error messages from being displayed on the screen, redirect stderr to /dev/null: When saving the program’s output to a file, it is quite common to redirect stderr to stdout so that you can have everything in a single file.
What happens if a logger writes to stderr?
Another pitfall is that if your logger writes to stderr itself we get infinite recursion (a stack overflow error). So only output to a file. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.