Xargs就可以了。维基百科

本文描述了解决并行执行的方法，它可以帮助您：Parallel execution in Bash
文章中的示例：

# !/bin/bash

RANDOM=10
JOBS_COUNTER=0
MAX_CHILDREN=10
MY_PID=$$

for i in {1..100}
do
    echo Cycle counter: $i
    JOBS_COUNTER=$((`ps ax -Ao ppid | grep $MY_PID | wc -l`))
    while [ $JOBS_COUNTER -ge $MAX_CHILDREN ]
    do
        JOBS_COUNTER=$((`ps ax -Ao ppid | grep $MY_PID | wc -l`))
        echo Jobs counter: $JOBS_COUNTER
        sleep 1
    done
    sleep $(($RANDOM % 30)) &
done
echo Finishing children ...

# wait for children here

while [ $JOBS_COUNTER -gt 1 ]
do
    JOBS_COUNTER=$((`ps ax -Ao ppid | grep $MY_PID | wc -l`))
    echo Jobs counter: $JOBS_COUNTER
    sleep 1
done
echo Done

我用这样的方法求解多进程：

# export variable to be used into function

export outlog="/tmp/out.log"
export faillog="/tmp/fail.log"
export ok="(curl: \(7\) Failed to connect to)" # acceptable responses

# create function:

check_site() {
  ip=$1
  resp=$(curl -i -m1 http://$ip 2>&1)
  echo "$resp" | grep -Eo "$ok" > /dev/null

  if [ $? -ne 0 ]; then
    echo -e "Command: curl -i -m1 http://$ip 2>&1" >> "${outlog}"
    echo -e "Block failed: $ip:\n\n \"$resp\"\n\n" >> "${outlog}"
    echo "$ip" >> "${faillog}"
  fi
}

# call the function:

export -f check_site
parallel -j 252 -a "${FILE}" check_site