### Solution 1: Using batch script (for Windows environment)
1. First, write a batch script (for example, named `compare.bat`):
```batch
@echo off
fc A.txt B.txt > temp.txt
for /f "tokens=1,2 delims= " %%a in ('findstr "c:\\my\\ab.exe" temp.txt') do (
set "old_date=%%b"
)
for /f "tokens=1,2 delims= " %%a in ('findstr "c:\\my\\ab.exe" B.txt') do (
set "new_date=%%b"
)
if "%old_date%" LSS "%new_date%" (
echo c:\my\ab.exe %new_date%
) else (
echo c:\my\ab.exe %old_date%
)
del temp.txt
```
- Explanation:
- The `fc` command is used to compare two files, and the result is redirected to `temp.txt`.
- Then, use `findstr` to find the line containing `c:\my\ab.exe` in `temp.txt` to get the old date.
- Then, find the line containing `c:\my\ab.exe` in `B.txt` to get the new date.
- Compare the two dates, and output the one with the more recent date.
### Solution 2: Using PowerShell (for Windows environment with PowerShell installed)
1. Open PowerShell and run the following commands:
```powershell
$a = Get-Content A.txt | Where-Object {$_ -match 'c:\\my\\ab.exe'}
$b = Get-Content B.txt | Where-Object {$_ -match 'c:\\my\\ab.exe'}
$dateA = $a.Split(' ')[1]
$dateB = $b.Split(' ')[1]
$dateAObj = [DateTime]::ParseExact($dateA, 'yyyy.MM.dd', $null)
$dateBObj = [DateTime]::ParseExact($dateB, 'yyyy.MM.dd', $null)
if ($dateAObj -lt $dateBObj) {
Write-Host "c:\my\ab.exe $dateB"
} else {
Write-Host "c:\my\ab.exe $dateA"
}
```
- Explanation:
- First, use `Get-Content` to read the contents of `A.txt` and `B.txt`, and then use `Where-Object` to filter the line containing `c:\my\ab.exe`.
- Then, split the line to get the date part.
- Parse the date strings into `DateTime` objects.
- Compare the two `DateTime` objects, and output the line with the more recent date.
