Pipe status after command substitution

问题:

I'd like to send the result of a series of commands to a variable:

variable=$(a | few | commands)

However, the command substitution resets PIPESTATUS, so I can't inspect where it went wrong after the fact. One solution would be to use mktemp and put the result there temporarily:

variable_file=$(mktemp) || exit 1
a | few | commands > $variable_file
exit_codes="${PIPESTATUS[*]}"
variable=$(<$variable_file)

Is there a more elegant solution?

回答1:

Kinda hacky but I think you could fudge it like this.

variable=$(a | few | commands; echo ": ${PIPESTATUS[*]}")
PIPESTATUS=(${variable##*: })
variable=${variable%:*}
variable=${variable%$'\n'}