参数列表太长 - 的Unix

问题描述

此脚本将按日期对文件进行排序，然后第2500个文件移动到另一个目录。结果
当我运行下面的脚本，系统提示出参数列表太长味精。任何人都可以帮助我提升脚本？谢谢

  NUM_OF_FILES = 2500
FROM_DIRECTORY = /应用/ DATA01 / RAID / RC / MD / IN_MSC / ERC /中
DESTINATION_DIRECTORY = /应用/ DATA01 / RAID / RC / MD / IN_MSC / ERC / in_load如果[！ -d $ DESTINATION_DIRECTORY]
        然后
                回声unused_file目录不存在！
        MKDIR $ DESTINATION_DIRECTORY
        回声$ DESTINATION_DIRECTORY目录中创建！
其他
        回声$ DESTINATION_DIRECTORY存在！
科幻
回声移动$ NUM_OF_FILES旧的文件到$ DESTINATION_DIRECTORY目录LS -TR $ FROM_DIRECTORY / MSCERC * .Z |头 -  $ NUM_OF_FILES |
    xargs的-i SH -cMV {} $ DESTINATION_DIRECTORY
 

解决方案

您不说，但我认为这是哪里出现问题：

  LS -tr $ FROM_DIRECTORY / MSCERC * .Z |头-2500 | \\
    xargs的-i SH -cMV {} $ DESTINATION_DIRECTORY
 

（您可通过添加设置-x你的脚本的顶部验证它。）

问题是，内核给一个新的进程的命令行的总长度的一个固定的最大大小，你超过了在 LS 命令。你可以解决它不使用通配符，而是使用的grep ：

  LS -tr $ FROM_DIRECTORY / | grep的/MSCERC\\*\\.Z$'|头-2500 | \\
    xargs的-i SH -cMV {} $ DESTINATION_DIRECTORY
 

（的grep 使用常规的前pressions而不是水珠，这样的模式看起来有点不同。）

This scripts will sort the files by date then move the first 2500 files to another directory.
When I run below scripts, system prompt out Argument list too long msg. Anyone can help me enhance the scripts ? Thanks

NUM_OF_FILES=2500
FROM_DIRECTORY=/apps/data01/RAID/RC/MD/IN_MSC/ERC/in
DESTINATION_DIRECTORY=/apps/data01/RAID/RC/MD/IN_MSC/ERC/in_load

if [ ! -d $DESTINATION_DIRECTORY ]
        then
                echo "unused_file directory does not exist!"
        mkdir $DESTINATION_DIRECTORY
        echo "$DESTINATION_DIRECTORY directory created!"
else
        echo "$DESTINATION_DIRECTORY exist!"
fi


echo "Moving $NUM_OF_FILES oldest files to $DESTINATION_DIRECTORY directory"

ls -tr  $FROM_DIRECTORY/MSCERC*.Z|head -$NUM_OF_FILES |
    xargs -i sh -c "mv {} $DESTINATION_DIRECTORY"

解决方案

You didn't say, but I assume this is where the problem occurs:

ls -tr  $FROM_DIRECTORY/MSCERC*.Z|head -2500 | \
    xargs -i sh -c "mv {} $DESTINATION_DIRECTORY"

(You can verify it by adding "set -x" to the top of your script.)

The problem is that the kernel has a fixed maximum size of the total length of the command line given to a new process, and your exceeding that in the ls command. You can work around it by not using globbing and instead using grep:

ls -tr  $FROM_DIRECTORY/ | grep '/MSCERC\*\.Z$' |head -2500 | \
    xargs -i sh -c "mv {} $DESTINATION_DIRECTORY"

(grep uses regular expressions instead of globs, so the pattern looks a little bit different.)

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