echo a loop with variables 命令

Question

我有几个列表，想对它们运行一些命令。由于列表很长，我想并行运行这些命令，因此使用nohup.
对于我尝试echo包含 nohup 命令的循环的每个项目，但它不起作用 -cat another_list_of_names读取到 stdout，但不读取到./tools. First catinfor a in $(cat list_of_names)将列表发送到循环，但echo'edfor b in $(cat another_list_of_names)将其发送到 stdout。
如何设置并行运行的 nohup 命令（是否可以nohup使用echo）？

for a in $(cat list_of_names)
      do              
          ID=`echo $a`
          mkdir ${ID}
          echo " 
             nohup sh -c '
             for b in $(cat another_list_of_names)
               do 
                  ./tools $b $a >> ${ID}/output
               done' &
           "

      done

Answer 1

我对您的代码进行了一些改进：

# This sort of loop is generally preferable to the one you had.
# This will handle spaces correctly.
while read a
do
   # There's no need for the extra 'echo'
   ID="$a"
   # Quote variables that may contain spaces
   mkdir "$ID"
   # This is a matter of taste, but I generally find heredocs to be more
   #  readable than long echo commands
   cat <<EOF
   nohup sh -c '
   while read b
   do
      # Quotation marks
      ./tools \$b $a >> "${ID}/output"
   done < another_list_of_names' &
EOF
done < list_of_names