Question

如何限制shell脚本的执行次数。我已经尝试了shc但是只有时间限制而不是使用限制。

Answer 1

您可以将文件用作“运行计数器”，并在执行期间读取该文件，以查看该脚本先前运行过多少次。

如果要在重新启动后保留“numOfRuns.txt”文件，请使用与/ tmp不同的目录作为根目录。

这是一个limitedScript.sh来演示这一点，首先是没有评论，然后是。

#!/bin/bash

runCountFile="/tmp/numOfRuns.txt"
maxRuns=3

if [ -e "$runCountFile" ]; then
    read value < "$runCountFile"
else
    value=0
fi

if ((value >= maxRuns)); then
    echo "Script has been run too many times"
    exit
else
    newValue=$((value + 1))
    echo $newValue > "$runCountFile"
fi

-

#!/bin/bash

# limitedScript.sh: Demonstrates simple run-limiting through a file-based counter

runCountFile="/tmp/numOfRuns.txt" # the file to store the number of times the script has run
maxRuns=3 # maximum number of executions for this script

if [ -e "$runCountFile" ]; then # does the run counter file exist?
    value=`cat $runCountFile` # read the value from the file
else
    value=0 # the script has never run yet if the "run counter" file doesn't exist
fi

if ((value >= maxRuns)); then
    echo "Script has been run too many times"
    exit
else
    newValue=$((value + 1))
    echo $newValue > "$runCountFile" #update the "run counter" file
fi

输出：

root@dev:/tmp# rm numOfRuns.txt
root@dev:/tmp# ./limitedScript.sh
root@dev:/tmp# ./limitedScript.sh
root@dev:/tmp# ./limitedScript.sh
root@dev:/tmp# ./limitedScript.sh
Script has been run too many times

限制shell脚本执行的次数

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