Introduction to the usage of DOS comparison operator

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Rem comparison operator:

EQU-equals

NEQ-not equal to

LSS-less than

LEQ-less than or equal to

GTR-greater than

GEQ-greater than or equal to

For example

If not in%==2 goto 2

Such as:

If in% NEQ 1 goto 2

Note that text comparison should use =

&: the previous command was executed successfully before the following command was executed.

| |: the previous command failed to execute before the following command was executed

&: execute the following command regardless of whether the previous command is successful or not

| |: pipe operator. The output of the previous command is used as the input of the following command. |

Demonstrate the deletion of files modified 7 days ago (including 7 days ago)

:: DateDel.bat-demonstrate deletion of files modified 7 days ago (including the 7th day): Will Sort-2021-8-26-CMD@WinXP:: Note: do not put this batch file in the directory where you need to choose to delete files:: the program only performs the deletion demonstration. If the demonstration is correct, deleting the echo in front of the del can be executed normally: if the date of the first execution is not 2021-8-26 You need to adjust the list of retention dates in the fourth line of code: the program needs to be run at least once a day To automatically update the date list @ echo offif "% 1" = ":" goto% 2if exist% temp%.\ _ DateDel.bat% temp%.\ _ DateDel.bat%0: Update 2021-08-20 2021-08-21 2021-08-22 2021-08-23 2021-08-24 2021-08-25 2021-08-26:Updatesetlocal EnableExtensionsset today=%date:~0,10%if not "% today%" = "% 9"% 0: Update% 4% 5% 6% 7% 8% 9 % today%echo% 0: Update% 3% 4% 5% 6% 7% 8% 9 >% temp%.\ _ DateDel.bat:Deletefor / r% f in (*. *) do if "% ~ tf" LEQ "% 3" echo del "% f": End

Batch numerical calculation and size comparison

Variable

Set variable

Set month=7

Use variables

% day%

Annotation

:: please run as administrator

Compare the size

EQU equals

NEQ is not equal to

LSS is less than

LEQ is less than or equal to

GTR is greater than

GEQ is greater than or equal to

If statement

If the date is greater than 31, the date is set to 1 and the month plus 1.

If% day% GTR 31 (set / a day=1 set / a month=month+1)

While cycle

Using the Goto statement to implement

: while

/ / Loop content

Pause

Goto: while

Output to screen

Echo date% form data has been copied to the clipboard

Output to text

Echo f > res.txt

Read text to clipboard

Clip < res.txt

Delete a file

Del res.txt

suspend

Pause

Turn off echo

@ echo off

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