[英]Bash script: how do I read a variable content from file file and increment it +1
I'm writing an basic bash script where I'm reading a file which contains initially "1" as content.我正在编写一个基本的 bash 脚本,其中我正在读取一个最初包含“1”作为内容的文件。 After reading it I want to increase it +1 everytime whenever I run the script.
阅读后,我想在每次运行脚本时将其增加 +1。
Example file: 1.txt示例文件:1.txt
1
Initial Content: 1初始内容:1
Expected output when run first time: 1.txt第一次运行时预期的 output:1.txt
2
Here is my script这是我的脚本
#!/misc/acc-archive/util/bash
i=$(<1.txt)
echo "$1"
j=$((i+=1))
echo "$1"
find . -exec perl -pi -e 's/$1/$j/g' 1.txt \;
You made a few mistakes.你犯了几个错误。 Here is a working copy:
这是一个工作副本:
i=$(cat 1.txt)
echo "i: $i"
j=$((i+=1))
echo "j: $j"
echo "$j" > 1.txt
I changed:我变了:
If you're replacing the entire contents of the file:如果要替换文件的全部内容:
#!/bin/bash
i=$(<1.txt)
echo "$((++i))" > 1.txt
If you need to edit numbers in place in multiple files, you should provide more specific details about your task.如果您需要在多个文件中编辑数字,您应该提供有关您的任务的更具体的详细信息。
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