Why doesn't the Linux redirection operator capture the output of my command?-CodePudding

Context: I have a program (go-sigma-rule-engine by Markus Kont) on my EC2 instance that runs against a logfile and produces some output to screen.

The command used to run this program is ./gsre/go-sigma-rule-engine run --rules-dir ./gsre/rules/ --sigma-input ./logs/exampleLog.json

The program produces output of the form:

INFO[2021-09-22T21:51:06Z] MATCH at offset 0 : [{[]  Example Activity Found}]   
INFO[2021-09-22T21:51:06Z] All workers exited, waiting on loggers to finish   
INFO[2021-09-22T21:51:06Z] Stats logger done   
INFO[2021-09-22T21:51:06Z] Done

Goal: I would like to capture this output and store it in a file.

Attempted Solution: I used the redirection operator to capture the output like so:
./gsre/go-sigma-rule-engine run --rules-dir ./gsre/rules/ --sigma-input ./logs/exampleLog.json > output.txt

Problem: The output.txt file is empty and didn't capture the output of the command invoking the rule engine.

CodePudding user response：

Maybe the output you want to capture goes to standard error rather than standard output. Try using 2> instead of > to redirect stderr.