shell script command example
1. Rename the file
Rename A.txt in drive D to B.txt
mv D:\\A.txt D:\\B.txt
2. Delete the file
Delete the A.txt file under the D drive
rm D:\\A.txt
3. Modify the file content and Save
//Get the content of A.txt in drive D
oldtime=$(cat D:\\A.txt)
//Get the current year, month and day
time=$(date +"%Y%m%d")
Replace the content of the A.txt file under the D drive with the current date and save it to the B.txt file under the D drive
sed s/$oldtime/$time/ D:\\A.txt >D:\\B.txt
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