Batch Script – Process


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In this chapter, we will discuss the various processes involved in Batch Script.

Viewing the List of Running Processes

In Batch Script, the TASKLIST command can be used to get the list of currently running processes within a system.

Syntax

TASKLIST [/S system [/U username [/P [password]]]] [/M [module] | /SVC | /V] [/FI filter]
[/FO format] [/NH]
S.No. Options & Description
1. /S system

Specifies the remote system to connect to

2.

/U

[domain\]user

Specifies the user context under which the command should execute.

3. /P [password]

Specifies the password for the given user context. Prompts for input if omitted.

4. /M [module]

Lists all tasks currently using the given exe/dll name. If the module name is not specified all loaded modules are displayed.

5. /SVC

Displays services hosted in each process.

6. /V

Displays verbose task information.

7. /FI filter

Displays a set of tasks that match a given criteria specified by the filter.

8. /FO format

Specifies the output format. Valid values: "TABLE", "LIST", "CSV".

9. /NH

Specifies that the "Column Header" should not show in the output. Valid only for "TABLE" and "CSV" formats.

Examples

TASKLIST

The above command will get the list of all the processes running on your local system. Following is a snapshot of the output which is rendered when the above command is run as it is. As you can see from the following output, not only do you get the various processes running on your system, you also get the memory usage of each process.

Image Name                    PID Session Name       Session#     Mem Usage
========================= ======== ================ =========== ============
System Idle Process             0 Services              0          4 K
System                          4 Services              0          272 K
smss.exe                        344 Services            0          1,040 K
csrss.exe                       528 Services            0          3,892 K
csrss.exe                       612 Console             1          41,788 K
wininit.exe                     620 Services            0          3,528 K
winlogon.exe                    648 Console             1          5,884 K
services.exe                    712 Services            0          6,224 K
lsass.exe                       720 Services            0          9,712 K
svchost.exe                     788 Services            0          10,048 K
svchost.exe                     832 Services            0          7,696 K
dwm.exe                         916 Console             1          117,440 K
nvvsvc.exe                      932 Services            0          6,692 K
nvxdsync.exe                    968 Console             1          16,328 K
nvvsvc.exe                      976 Console             1          12,756 K
svchost.exe                     1012 Services           0          21,648 K
svchost.exe                     236 Services            0          33,864 K
svchost.exe                     480 Services            0          11,152 K
svchost.exe                     1028 Services           0          11,104 K
svchost.exe                     1048 Services           0          16,108 K
wlanext.exe                     1220 Services           0          12,560 K
conhost.exe                     1228 Services           0          2,588 K
svchost.exe                     1276 Services           0          13,888 K
svchost.exe                     1420 Services           0          13,488 K
spoolsv.exe                     1556 Services           0          9,340 K

tasklist > process.txt

The above command takes the output displayed by tasklist and saves it to the process.txt file.

tasklist /fi "memusage gt 40000"

The above command will only fetch those processes whose memory is greater than 40MB. Following is a sample output that can be rendered.

Image Name                    PID Session Name       Session#     Mem Usage
========================= ======== ================ =========== ============
dwm.exe                         916 Console              1        127,912 K
explorer.exe                    2904 Console             1        125,868 K
ServerManager.exe               1836 Console             1        59,796 K
WINWORD.EXE                     2456 Console             1        144,504 K
chrome.exe                      4892 Console             1        123,232 K
chrome.exe                      4976 Console             1        69,412 K
chrome.exe                      1724 Console             1        76,416 K
chrome.exe                      3992 Console             1        56,156 K
chrome.exe                      1168 Console             1        233,628 K
chrome.exe                      816 Console              1        66,808 K

Killing a Particular Process

Allows a user running Microsoft Windows XP professional, Windows 2003, or later to kill a task from a Windows command line by process id (PID) or image name. The command used for this purpose is the TASKILL command.

Syntax

TASKKILL [/S system [/U username [/P [password]]]] { [/FI filter] 
[/PID processid | /IM imagename] } [/T] [/F]
S.No. Options & Description
1. /S system

Specifies the remote system to connect to

2.

/U

[domain\]user

Specifies the user context under which the command should execute.

3. /P [password]

Specifies the password for the given user context. Prompts for input if omitted.

4.

/FI

FilterName

Applies a filter to select a set of tasks. Allows "*" to be used. ex. imagename eq acme* See below filters for additional information and examples.

5.

/PID

processID

Specifies the PID of the process to be terminated. Use TaskList to get the PID.

6.

/IM

ImageName

Specifies the image name of the process to be terminated. Wildcard '*' can be used to specify all tasks or image names.

7. /T

Terminates the specified process and any child processes which were started by it.

8. /F

Specifies to forcefully terminate the process(es).

Examples

taskkill /f /im notepad.exe

The above command kills the open notepad task, if open.

taskill /pid 9214

The above command kills a process which has a process of 9214.

Starting a New Process

DOS scripting also has the availability to start a new process altogether. This is achieved by using the START command.

Syntax

START "title" [/D path] [options] "command" [parameters]

Wherein

  • title − Text for the CMD window title bar (required.)

  • path − Starting directory.

  • command − The command, batch file or executable program to run.

  • parameters − The parameters passed to the command.

S.No. Options & Description
1. /MIN

Start window Minimized

2. /MAX

Start window maximized.

3. /LOW

Use IDLE priority class.

4. /NORMAL

Use NORMAL priority class.

5. /ABOVENORMAL

Use ABOVENORMAL priority class.

6. /BELOWNORMAL

Use BELOWNORMAL priority class.

7. /HIGH

Use HIGH priority class.

8. /REALTIME

Use REALTIME priority class.

Examples

START "Test Batch Script" /Min test.bat

The above command will run the batch script test.bat in a new window. The windows will start in the minimized mode and also have the title of “Test Batch Script”.

START "" "C:\Program Files\Microsoft Office\Winword.exe" "D:\test\TESTA.txt"

The above command will actually run Microsoft word in another process and then open the file TESTA.txt in MS Word.



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