Question

我正在开发一个我需要在machineX上运行的shell脚本。它会在其他两台计算机YYYYMMDD和MAPPED_LOCATION中检查此文件夹machineP内的格式为machineQ的文件夹。因此machineP和machineQ -

中的路径都是这样的

/bat/testdata/t1_snapshot/20140311

在上面的文件夹路径中，里面会有一些文件。下面是我的shell脚本 -

#!/bin/bash

readonly MACHINES=(machineP machineQ)
readonly MAPPED_LOCATION=/bat/testdata/t1_snapshot
readonly FILE_TIMESTAMP=20140311

# old code which I was using to get the latest folder inside each machine (P and Q)
dir1=$(ssh -o "StrictHostKeyChecking no" david@${MACHINES[0]} ls -dt1 "$MAPPED_LOCATION"/[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9] | head -n1)
dir2=$(ssh -o "StrictHostKeyChecking no" david@${MACHINES[1]} ls -dt1 "$MAPPED_LOCATION"/[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9] | head -n1)

dir3=$MAPPED_LOCATION/$FILE_TIMESTAMP # /bat/testdata/t1_snapshot/20140311

echo $dir1
echo $dir2
echo $dir3

if dir3 path exists in both the machines (P and Q) and number of files is greater than zero in each machine
then

    # then do something here
    echo "Hello World"

else

    # log an error - folder is missing or number of files is zero in which servers or both servers

fi

Noow我应该做的是 - 如果这两台机器中存在/bat/testdata/t1_snapshot/20140311并且两台机器中的文件数大于零，那么就做一些事情。否则，如果任何服务器中的文件夹丢失或者任何其他服务器中的文件数为零，我将退出shell脚本，其状态为非零状态，并显示实际错误消息。

我怎样才能在shell脚本中执行此操作？

更新： -

for machine in $MACHINES; do
   dircheck=($(ssh -o "StrictHostKeyChecking no" david@${machine} [[ ! -d "$dir3" ]] \&\& exit 1 \; ls -t1 "$dir3"))

   #On the ssh command, we exit 1 if the folder doesn't exist. We check the return code with `$?`
   if [[ $? != 0 ]] ;then
       echo "Folder doesn't exist on $machine"; 
       exit 1
   fi

   # check number of files retrieved
   if [[ "${dircheck[@]}" = 0 ]] ;then
       echo "0 Files on server $machine"; 
       exit 1
   fi
  #all good for $machine here
done

echo "Everything is Correct"

如果我在20140411内添加一个新的空文件夹machineP，然后执行上面的脚本，它总是打印出来 -

echo "Everything is Correct"

事实上，我没有在machineQ中添加任何文件夹。不确定是什么问题？

另一次更新 -

我仅在20140411中创建了一个空文件夹machineP。然后我以调试模式运行脚本 -

david@machineX:~$ ./test_file_check_1.sh
+ FILERS_LOCATION=(machineP machineQ)
+ readonly FILERS_LOCATION
+ readonly MEMORY_MAPPED_LOCATION=/bexbat/data/be_t1_snapshot
+ MEMORY_MAPPED_LOCATION=/bexbat/data/be_t1_snapshot
+ readonly FILE_TIMESTAMP=20140411
+ FILE_TIMESTAMP=20140411
+ dir3=/bexbat/data/be_t1_snapshot/20140411
+ echo /bexbat/data/be_t1_snapshot/20140411
/bexbat/data/be_t1_snapshot/20140411
+ for machine in '$FILERS_LOCATION'
+ dircheck=($(ssh -o "StrictHostKeyChecking no" david@${machine} [[ ! -d "$dir3" ]] \&\& exit 1 \; ls -t1 "$dir3"))
++ ssh -o 'StrictHostKeyChecking no' david@machineP '[[' '!' -d /bexbat/data/be_t1_snapshot/20140411 ']]' '&&' exit 1 ';' ls -t1 /bexbat/data/be_t1_snapshot/20140411
+ [[ 0 != 0 ]]
+ [[ '' = 0 ]]
+ echo 'Everything is Correct'
Everything is Correct

Answer 1

你要做的是，远程目录（删除-d标志到ls（仅列出文件夹）和head -n1命令，因为它只打印第一个文件）并检索数组变量中的数据。

我还在执行[[ -d "$dir3" ]]之前添加了对目录存在ls的检查，并转义了＆amp;＆amp;不能在当前的bash脚本中解释。

[[ -d "$dir3" ]] \&\& ls -t1 "$dir3"

要定义bash数组，请在命令周围添加额外的( )，然后比较数组大小。

dir3="$MAPPED_LOCATION/$FILE_TIMESTAMP" # /bat/testdata/t1_snapshot/20140311

for machine in ${MACHINES[*]}; do
   dir3check=($(ssh -o "StrictHostKeyChecking no" david@${machine} [[ -d "$dir3" ]] \&\& ls -t1 "$dir3"))

   if [[ "${#dir3check[@]}" -gt 0 ]] ;then
       # then do something here
       echo "Hello World"
   else
       # log an error - folder is missing or number of files is zero in server $machine
   fi
done

更新：

for machine in ${MACHINES[*]}; do
   dircheck=($(ssh -o "StrictHostKeyChecking no" david@${machine} [[ ! -d "$dir3" ]] \&\& exit 1 \; ls -t1 "$dir3"))

   #On the ssh command, we exit 1 if the folder doesn't exist. We check the return code with `$?`
   if [[ $? != 0 ]] ;then
       echo "Folder doesn't exist on $machine"; 
       exit 1
   fi

   # check number of files retrieved
   if [[ "${#dircheck[@]}" = 0 ]] ;then
       echo "0 Files on server $machine"; 
       exit 1
   fi
  #all good for $machine here
done
#all good for all machines here

如何使用shell脚本检查2台机器中的文件夹？

1 个答案: