" I also observed that I couldn't redirect STDERR with out also redirecting STDOUT. The answer wherever programA sends STDOUT to STDIN of programB, then redirects STDERR to the log file: programA 2> /var/log/programA.log AkeoAkeo 20611 silver badge44 bronze badges Include a remark Examine to check out if modem-manager is https://alfredo012gfd3.blogozz.com/profile