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Why are exit codes included in a bash script?
Exit codes are included in the script output. Naturally, when you have a more complicated bash script, you’ll see more telling output from the command. For example, let’s say you write a bash script that requires input of a filename and said file will be deleted.
How to capture the exit status in Bash?
Bonus: in the end the exit status is actually an exit status and not some string in a file. you want the exit status from someprog and the output from filter. ( ( ( (someprog; echo $? >&3) | filter >&4) 3>&1) | (read xs; exit $xs)) 4>&1 echo $?
What is the return value of pipefail in Bash?
using bash’s set -o pipefail is helpful pipefail: the return value of a pipeline is the status of the last command to exit with a non-zero status, or zero if no command exited with a non-zero status
How to pipe output from Bash to zsh?
Or another alternative which also works with other shells (like zsh) would be to enable pipefail: set -o pipefail The first option does not work with zsh due to a little bit different syntax.
How to redirect output to the log file?
In Unix shell, I have a env file ( env file defines the parameters required for running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc) which redirects all the outputs ( echo messages) and errors to the log file from the executed script using the following code:
How to write output to stdout and log file?
The /tmp/both.log is appended unless you remove the -a from tee. Hint: > (…) is a process substitution. It lets the exec to the tee command as if it were a file. I wanted to display logs on stdout and log file along with the timestamp. None of the above answers worked for me.
How to write a message to both the console and the log file?
to write a message to both the console and the log file – tee sends its output to both its own fd 1 (which here is the LOG_FILE) and the file you told it to write to (which here is fd 3, i.e. the console). Example: into the log file. It worked just as you suggested.