![Batch Files: Echo
Echo
Turns the command -echoing feature on or off, or displays a message. Used without parameters, echo displays the current echo
setting.
Syntax
echo [{on |off}] [ message]
Parameters
{on|off }
Specifies whether to turn the command- echoing feature on or off.
message
Specifies text you want to display on the screen.
/?
Displays help at the command prompt.
Remarks
? The echo message command is useful when echo is turned off. To display a message that is several lines long without displaying
other commands, you can include several echo message commands after the echo off command in your batch program.
? If you use echo off, the command prompt does not appear on your screen. To display the command prompt, type echo on.
? To prevent echoing of a line, insert an at sign (@) in front of a command in a batch program.
? To echo a blank line on the screen, type:
echo.
? To display a pipe (|) or redirection character (< or >) when you are using echo, use a caret character immediately before the
pipe or redirection character (for example, ^>, ^<, or ^| ). If you need to use the caret character (^), type two (^^).
Examples
The following example is a batch program that includes a three -line message preceded by and then followed by a blank line:
echo off
echo.
echo This batch program
echo formats and checks
echo new disks
echo.
If you want to turn echo off and you do not want to echo the echo command, type an at sign (@) before the command as follows:
@echo off
You can use the if and echo commands on the same command line. For example:
if exist *.rpt echo The report has arrived.
Formatting legend
Format Meaning
Italic Information that the user must supply
Bold Elements that the user must type exactly as shown
Parameter that can be repeated several times in a command
Ellipsis (...)
line
Between brackets ([]) Optional items
Between braces ({}); choices separated by pipe (|). Example:
Set of choices from which the user must choose only one
{even|odd}
Courier font Code or program output
Pause](https://image.slidesharecdn.com/doscommands-121220115642-phpapp01/85/Doscommands-9-320.jpg)
![Batch Files: If
If
Performs conditional processing in batch programs.
Syntax
if [ not] errorlevel number command [else expression ]
if [ not] string1 ==string2 command [else expression ]
if [ not] exist filename command [else expression ]
If command extensions are enabled, use the following syntax:
if [ /i] string1 CompareOp string2 command [ else expression ]
if cmdextversion number command [else expression ]
if defined variable command [ else expression ]
Parameters
not
Specifies that the command should be carried out only if the condition is false.
errorlevel number
Specifies a true condition only if the previous program run by Cmd.exe returned an exit code equal to or greater than number.
command
Specifies the command that should be carried out if the preceding condition is met.
string1 ==string2
Specifies a true condition only if string1 and string2 are the same. These values can be literal strings or batch variables (for
example, %1). You do not need to use quotation marks around literal strings.
exist filename
Specifies a true condition if filename exists.
CompareOp
Specifies a three-letter comparison operator. The following table lists valid values for CompareOp .
Operator Description
EQU equal to
NEQ not equal to
LSS less than
LEQ less than or equal to
GTR greater than
GEQ greater than or equal to
/i
Forces string comparisons to ignore case. You can use /i on the string1 ==string2 form of if. These comparisons are generic, in
that if both string1 and string2 are both comprised of all numeric digits, the strings are converted to numbers and a numeric
comparison is performed.
cmdextversion number
Specifies a true condition only if the internal version number associated with the Command Extensions feature of Cmd.exe is equal
to or greater than number . The first version is 1. It is incremented by one when significant enhancements are added to the
command extensions. The cmdextversion conditional is never true when command extensions are disabled (by default, command
extensions are enabled).
defined variable
Specifies a true condition if variable is defined.
expression
Specifies a command- line command and any parameters to be passed to the command in an else clause.
/?
Displays help at the command prompt.](https://image.slidesharecdn.com/doscommands-121220115642-phpapp01/85/Doscommands-10-320.jpg)
![if not errorlevel 1 goto end
echo An error occurred during formatting.
:end
echo End of batch program.
If no error occurs, the error message does not appear.
You cannot use the if command to test directly for a directory, but the null (NUL) device does exist in every directory. As a result, you
can test for the null device to determine whether a directory exists. The following example tests for the existence of a directory:
if exist c:mydirnul goto process
Formatting legend
Format Meaning
Italic Information that the user must supply
Bold Elements that the user must type exactly as shown
Parameter that can be repeated several times in a command
Ellipsis (...)
line
Between brackets ([]) Optional items
Between braces ({}); choices separated by pipe (|). Example:
Set of choices from which the user must choose only one
{even|odd}
Courier font Code or program output](https://image.slidesharecdn.com/doscommands-121220115642-phpapp01/85/Doscommands-12-320.jpg)
![MODE
Configures system devices.
Serial port: MODE COMm[:] [BAUD=b] [PARITY=p] [DATA=d] [STOP=s]
[to=on|off] [xon=on|off] [odsr=on|off]
[octs=on|off] [dtr=on|off|hs]
[rts=on|off|hs|tg] [idsr=on|off]
Device Status: MODE [device] [/STATUS]
Redirect printing: MODE LPTn[:]=COMm[:]
Select code page: MODE CON[:] CP SELECT=yyy
Code page status: MODE CON[:] CP [/STATUS]
Display mode: MODE CON[:] [COLS=c] [LINES=n]
Typematic rate: MODE CON[:] [RATE=r DELAY=d]](https://image.slidesharecdn.com/doscommands-121220115642-phpapp01/85/Doscommands-13-320.jpg)
Doscommands
- 1. DOS Commands (DOS Prompt) Command -line reference A-Z To find information about a command, on the A- Z button menu at the top of this page, click the letter that the command starts with, and then click the command name. In addition to the tools installed with Windows XP , there are over 40 support tools included on the Windows XP CD. You can use these tools to diagnose and resolve computer problems. For more information about these support tools, see Windows Support Tools For information about installing support tools, see Install Windows Support Tools For more information about changes to the functionality of MS- DOS commands, new command-line tools, command shell functionality, configuring the command prompt, and automating commmand -line tasks, see Command-line reference Command-line tools must be run at the prompt of the Cmd.exe command interpreter. To open Command Prompt, click Start , click Run, type cmd , and then click OK . To view help at the command-line, at the command prompt, type the following: CommandName /? A Arp Assoc At Atmadm Attrib B Batch files Bootcfg Break C Cacls Call Certreq Certutil Change Chcp Chdir Chkdsk Chkntfs Cipher Cls Cluadmin Cluster Cmd
- 2. Cmstp Color Command shell overview Comp Compact Convert Convlog Copy Cprofile CScript overview CSVDE D Date DCGPOFix Defrag Del Dfscmd Dir Diskcomp Diskcopy DiskPart Doskey Driverquery Ds (directory service) Dsadd Dsget Dsmod Dsmove Dsquery Dsrm E Echo Endlocal Eventcreate Eventquery Eventtriggers
- 3. Evntcmd Exit Expand F Fc Filter commands Find Findstr Finger Flattemp For Format Fsutil Ftp Ftp subcommands Ftype G Getmac Goto Gpresult Gpupdate Graftabl H Help Helpctr Hostname I If Iisapp Iisback Iiscnfg Iisftp Iisftpdr Iisreset Iisvdir
- 4. Iisweb Ipconfig Ipxroute Irftp L Label Ldifde Lodctr Logman Lpq Lpr M Macfile Mkdir (md) Mmc Mode More Mountvol Move Mrinfo MS -DOS subsystem configuration commands Msiexec Msinfo32 N Nbtstat Net services overview Net services commands Netsh Netsh commands for AAAA Netsh commands for DHCP Netsh diagnostic (diag) commands Netsh commands for IP Netsh commands for RAS Netsh commands for Routing Netsh commands for WINS
- 5. Netstat Nlb Nslookup Nslookup subcommands Ntbackup Ntcmdprompt Ntdsutil Ntsd O Openfiles P Pagefileconfig Path Pathping Pause Pbadmin Pentnt Perfmon Ping Popd Print Prncnfg Prndrvr Prnjobs Prnmngr Prnport Prnqctl Proccon Prompt Pushd Q Query R Rasdial Rcp
- 6. Recover Redirection operators Reg Regsvr32 Relog Rem Rename Replace Reset session Rexec Risetup Rmdir Route Rsh Rsm Rss Runas S Sc Schtasks Secedit Set Setlocal Shift Shutdown Sort Start Subst Systeminfo System File Checker (sfc) T Tapicfg Taskkill Tasklist Tcmsetup TCP/IP utilities and services
- 7. Telnet commands Terminal Services commands Tftp Time Title Tracerpt Tracert Tree Tsecimp Type Typeperf U Unlodctr V Ver Verify Vol Vssadmin W W32tm Winnt Winnt32 Wlbs WMIC overview X Xcopy
- 8. Batch Files Using batch files With batch files, which are also called batch programs or scripts , you can simplify routine or repetitive tasks. A batch file is an unformatted text file that contains one or more commands and has a .bat or .cmd file name extension. When you type the file name at the command prompt, Cmd.exe runs the commands sequentially as they appear in the file. You can include any command in a batch file. Certain commands, such as for, goto , and if , enable you to do conditional processing of the commands in the batch file. For example, the if command carries out a command based on the results of a condition. Other commands allow you to control input and output and call other batch files. The standard error codes that most applications return are 0 if no error occurred and 1 (or higher value) if an error occurred. Please refer to your application help documentation to determine the meaning of specific error codes. For more information about batch file operations, see the following topics: ? Using batch parameters ? Using filters ? Using command redirection operators For more information about commands that you can use in batch files, click a command: ? Call ? Echo ? Endlocal ? For ? Goto ? If ? Pause ? Rem ? Setlocal ? Shift
- 9. Batch Files: Echo Echo Turns the command -echoing feature on or off, or displays a message. Used without parameters, echo displays the current echo setting. Syntax echo [{on |off}] [ message] Parameters {on|off } Specifies whether to turn the command- echoing feature on or off. message Specifies text you want to display on the screen. /? Displays help at the command prompt. Remarks ? The echo message command is useful when echo is turned off. To display a message that is several lines long without displaying other commands, you can include several echo message commands after the echo off command in your batch program. ? If you use echo off, the command prompt does not appear on your screen. To display the command prompt, type echo on. ? To prevent echoing of a line, insert an at sign (@) in front of a command in a batch program. ? To echo a blank line on the screen, type: echo. ? To display a pipe (|) or redirection character (< or >) when you are using echo, use a caret character immediately before the pipe or redirection character (for example, ^>, ^<, or ^| ). If you need to use the caret character (^), type two (^^). Examples The following example is a batch program that includes a three -line message preceded by and then followed by a blank line: echo off echo. echo This batch program echo formats and checks echo new disks echo. If you want to turn echo off and you do not want to echo the echo command, type an at sign (@) before the command as follows: @echo off You can use the if and echo commands on the same command line. For example: if exist *.rpt echo The report has arrived. Formatting legend Format Meaning Italic Information that the user must supply Bold Elements that the user must type exactly as shown Parameter that can be repeated several times in a command Ellipsis (...) line Between brackets ([]) Optional items Between braces ({}); choices separated by pipe (|). Example: Set of choices from which the user must choose only one {even|odd} Courier font Code or program output Pause
- 10. Batch Files: If If Performs conditional processing in batch programs. Syntax if [ not] errorlevel number command [else expression ] if [ not] string1 ==string2 command [else expression ] if [ not] exist filename command [else expression ] If command extensions are enabled, use the following syntax: if [ /i] string1 CompareOp string2 command [ else expression ] if cmdextversion number command [else expression ] if defined variable command [ else expression ] Parameters not Specifies that the command should be carried out only if the condition is false. errorlevel number Specifies a true condition only if the previous program run by Cmd.exe returned an exit code equal to or greater than number. command Specifies the command that should be carried out if the preceding condition is met. string1 ==string2 Specifies a true condition only if string1 and string2 are the same. These values can be literal strings or batch variables (for example, %1). You do not need to use quotation marks around literal strings. exist filename Specifies a true condition if filename exists. CompareOp Specifies a three-letter comparison operator. The following table lists valid values for CompareOp . Operator Description EQU equal to NEQ not equal to LSS less than LEQ less than or equal to GTR greater than GEQ greater than or equal to /i Forces string comparisons to ignore case. You can use /i on the string1 ==string2 form of if. These comparisons are generic, in that if both string1 and string2 are both comprised of all numeric digits, the strings are converted to numbers and a numeric comparison is performed. cmdextversion number Specifies a true condition only if the internal version number associated with the Command Extensions feature of Cmd.exe is equal to or greater than number . The first version is 1. It is incremented by one when significant enhancements are added to the command extensions. The cmdextversion conditional is never true when command extensions are disabled (by default, command extensions are enabled). defined variable Specifies a true condition if variable is defined. expression Specifies a command- line command and any parameters to be passed to the command in an else clause. /? Displays help at the command prompt.
- 11. Remarks ? If the condition specified in an if command is true, the command that follows the condition is carried out. If the condition is false, the command in the if clause is ignored, and executes any command in the else clause, if one has been specified. ? When a program stops, it returns an exit code. You can use exit codes as conditions by using the errorlevel parameter. ? Using defined variable If you use defined variable , the following three variables are added: %errorlevel% , %cmdcmdline% , and % cmdextversion% . %errorlevel% expands into a string representation of the current value of errorlevel , provided that there is not already an environment variable with the name ERRORLEVEL, in which case you get the ERRORLEVEL value instead. The following example illustrates how you can use errorlevel after running a batch program: goto answer%errorlevel% :answer0 echo Program had return code 0 :answer1 echo Program had return code 1 goto end :end echo done! You can also use the CompareOp comparison operators as follows: if %errorlevel% LEQ 1 goto okay %cmdcmdline% expands into the original command line passed to Cmd.exe prior to any processing by Cmd.exe, provided that there is not already an environment variable with the name cmdcmdline, in which case you get the cmdcmdline value instead. %cmdextversion% expands into the a string representation of the current value of cmdextversion, provided that there is not already an environment variable with the name CMDEXTVERSION, in which case you get the CMDEXTVERSION value instead. ? Using the else clause You must use the else clause on the same line as the command after the if. For example: IF EXIST filename. ( del filename. ) ELSE ( echo filename. missing. ) The following code does not work because you must terminate the del command by a new line: IF EXIST filename. del filename. ELSE echo filename. missing The following code does not work because you must use the else clause on the same line as the end of the if command: IF EXIST filename. del filename. ELSE echo filename. missing If you want to format it all on a single line, use the following form of the original statement: IF EXIST filename. (del filename.) ELSE echo filename. missing Examples If the file Product.dat cannot be found, the following message appears: if not exist product.dat echo Can't find data file If an error occurs during the formatting of the disk in drive A, the following example displays an error message: :begin @echo off format a: /s
- 12. if not errorlevel 1 goto end echo An error occurred during formatting. :end echo End of batch program. If no error occurs, the error message does not appear. You cannot use the if command to test directly for a directory, but the null (NUL) device does exist in every directory. As a result, you can test for the null device to determine whether a directory exists. The following example tests for the existence of a directory: if exist c:mydirnul goto process Formatting legend Format Meaning Italic Information that the user must supply Bold Elements that the user must type exactly as shown Parameter that can be repeated several times in a command Ellipsis (...) line Between brackets ([]) Optional items Between braces ({}); choices separated by pipe (|). Example: Set of choices from which the user must choose only one {even|odd} Courier font Code or program output
- 13. MODE Configures system devices. Serial port: MODE COMm[:] [BAUD=b] [PARITY=p] [DATA=d] [STOP=s] [to=on|off] [xon=on|off] [odsr=on|off] [octs=on|off] [dtr=on|off|hs] [rts=on|off|hs|tg] [idsr=on|off] Device Status: MODE [device] [/STATUS] Redirect printing: MODE LPTn[:]=COMm[:] Select code page: MODE CON[:] CP SELECT=yyy Code page status: MODE CON[:] CP [/STATUS] Display mode: MODE CON[:] [COLS=c] [LINES=n] Typematic rate: MODE CON[:] [RATE=r DELAY=d]