我拥有一个运行 raspbian jessie 的树莓派。我使用带有 Motioneye 的树莓派作为系统监控。 Motioneye 将文件记录到 SD 卡，但我想在磁盘使用量满时删除文件夹 /var/lib/motioneye 中的旧文件。 Motioneye 将电影文件记录在 /var/lib/motioneye 中，并包含每天的子目录，例如 /var/lib/motioneye/2016-02-13/files_in_order。 Motioneye 使用此权限记录文件 drwxr-xr-x 2 root root 4096 Feb 13 17:03 2016-02-13 所以我无法删除具有用户访问权限的文件，我需要处于 root 状态。我可以毫无问题地运行脚本
sudo bash ./deleteoldfiles.sh
但是当我在 crontab 中输入它时，脚本不起作用，我尝试输入路径但没有成功。我在互联网上找到了这个脚本，进行了一些修改，以便它可以接受文件夹而不是安装驱动程序，我在脚本文件夹链接和最大使用量中写入。我的脚本如下所示：
#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/pi/
###############################################################################
# Author : Louwrentius
# Contact : [email protected]
# Initial release : August 2011
# Licence : Simplified BSD License
###############################################################################
VERSION=1.01
#
# Mounted volume to be monitored.
#
MOUNT="/var/lib/motioneye"
#
# Maximum threshold of volume used as an integer that represents a percentage:
# 95 = 95%.
#
MAX_USAGE="90"
#
# Failsafe mechansim. Delete a maxium of MAX_CYCLES files, raise an error after
# that. Prevents possible runaway script. Disable by choosing a high value.
#
MAX_CYCLES=10
show_header () {
echo
echo DELETE OLD FILES $VERSION
echo
}
show_header
reset () {
CYCLES=0
OLDEST_FILE=""
OLDEST_DATE=0
ARCH=`uname`
}
reset
if [ -z "$MOUNT" ] || [ ! -e "$MOUNT" ] || [ ! -d "$MOUNT" ] || [ -z "$MAX_USAGE" ]
then
echo "Usage: $0 <mountpoint> <threshold>"
echo "Where threshold is a percentage."
echo
echo "Example: $0 /storage 90"
echo "If disk usage of /storage exceeds 90% the oldest"
echo "file(s) will be deleted until usage is below 90%."
echo
echo "Wrong command line arguments or another error:"
echo
echo "- Directory not provided as argument or"
echo "- Directory does not exist or"
echo "- Argument is not a directory or"
echo "- no/wrong percentage supplied as argument."
echo
exit 1
fi
check_capacity () {
USAGE=`df -h "$MOUNT"| tail -1 | awk '{ print $5 }' | sed s/%//g`
if [ ! "$?" == "0" ]
then
echo "Error: mountpoint $MOUNT not found in df output."
exit 1
fi
if [ -z "$USAGE" ]
then
echo "Didn't get usage information of $MOUNT"
echo "Mountpoint does not exist or please remove trailing slash."
exit 1
fi
if [ "$USAGE" -gt "$MAX_USAGE" ]
then
echo "Usage of $USAGE% exceeded limit of $MAX_USAGE percent."
return 0
else
echo "Usage of $USAGE% is within limit of $MAX_USAGE percent."
return 1
fi
}
check_age () {
FILE="$1"
if [ "$ARCH" == "Linux" ]
then
FILE_DATE=`stat -c %Z "$FILE"`
elif [ "$ARCH" == "Darwin" ]
then
FILE_DATE=`stat -f %Sm -t %s "$FILE"`
else
echo "Error: unsupported architecture."
echo "Send a patch for the correct stat arguments for your architecture."
fi
NOW=`date +%s`
AGE=$((NOW-FILE_DATE))
if [ "$AGE" -gt "$OLDEST_DATE" ]
then
export OLDEST_DATE="$AGE"
export OLDEST_FILE="$FILE"
fi
}
process_file () {
FILE="$1"
#
# Replace the following commands with wathever you want to do with
# this file. You can delete files but also move files or do something else.
#
echo "Deleting oldest file $FILE"
rm -f "$FILE"
}
while check_capacity
do
if [ "$CYCLES" -gt "$MAX_CYCLES" ]
then
echo "Error: after $MAX_CYCLES deleted files still not enough free space."
exit 1
fi
FILES=`find "$MOUNT" -type f`
IFS=$'\n'
for x in $FILES
do
check_age "$x"
done
if [ -e "$OLDEST_FILE" ]
then
#
# Do something with file.
#
process_file "$OLDEST_FILE"
else
echo "Error: somehow, item $OLDEST_FILE disappeared."
fi
((CYCLES++))
done
echo
我在 sudo crontab -e 中输入：
#Borrowed from anacron SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
#End borrowed from anacron
* * * * * /home/pi/deleteoldfiles.sh
抱歉，帖子很长，我试图解释发生了什么，也许我会得到一些帮助。谢谢 ！
答案1
我做到了 ！我删除了 sudo crontab -e 中的所有内容并仅在 crontab -e 中输入了这一行
* * * * * sudo bash -x /home/pi/deleteoldfiles.sh > /home/pi/output.txt 2>&1
它正在工作，我有一个日志文件，我可以跟踪它是否工作正常。谢谢你们 ！
答案2
很好的脚本，但你应该在后面添加这两行((CYCLES++))：
OLDEST_FILE=""
OLDEST_DATE=0
删除新的最旧的文件。