linux - Multithreading a Bash Script -


i'm finding difficult run script multithreaded.

i cannot fix script, not know error making, there not many examples in stack.

#!/bin/bash  function teste(){      in $(seq 0 10);      connect_timeout=1 # in seconds     a="$1."     b=$i     ip_address=$a$b     port="${2}"      set +e     data=$(curl --head -vs -m ${connect_timeout} http://${ip_address}:${port} 2>&1)      exit_code="$?"     data=$(echo -ne "${data}" | grep "server: ")      set -e      if [[ ${exit_code} -eq 0 ]];     if [[ -n "${data}" ]];     echo -ne "${ip_address} - ${data}"     else     echo "${ip_address} - got empty data server!"     fi     else     echo "${ip_address} - no server."     fi      done  } function doexecute(){ set -e  if [[ $# -ne 2 ]]; echo "usage: $(basename "$0") ip_address_number port"  exit 1 fi  threads=10;  threads=$(( $threads - 1))  thread in `seq $threads` teste ${1} & done } doexecute

your doexecute function expects 2 arguments, else prints error message , exits (not returns). so, when call without argument exits calling shell.


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