shellcheck has this to say: In exec.sh line 1: if [ exec 1>/dev/null 2>/dev/null 3>/dev/tcp/localhost/4000 ] ; then ^-- SC1009: The mentioned synta

shellcheck has this to say: In exec.sh line 1: if [ exec 1>/dev/null 2>/dev/null 3>/dev/tcp/localhost/4000 ] ; then ^-- SC1009: The mentioned syntax error was in this if expression. ^-- SC1073: Couldn't parse this test expression. Fix to allow more checks. ^-- SC1014: Use 'if cmd; then ..' to check exit code, or 'if [[ $(cmd) == .. ]]' to check output. ^-- SC1072: Expected test to end here (don't wrap commands in []/[[]]). Fix any mentioned problems and try again. For more information: https://www.shellcheck.net/wiki/SC1014 -- Use 'if cmd; then ..' to check ex... https://www.shellcheck.net/wiki/SC1072 -- Expected test to end here (don't ... https://www.shellcheck.net/wiki/SC1073 -- Couldn't parse this test expressi...