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Text File | 1991-01-21 | 10.2 KB | 301 lines

------------------------------------------------------------------------- SECTION 7 Batch Command Reference ------------------------------------------------------------------------- 7.1 Batch Primer A detailed description of DOS or its function would be a long and lengthy undertaking. So, in order to make this text as brief and meaningful as possible, each individual Batch command will be touched upon as it pertains to the SYSTEM MASTER command Processor. (See the DOS Manual for your particular version of DOS for detailed descriptions of each of the following commands). Batch Commands (Listing)(DOS ver 3.3 specific) :label @ %# %string% CALL ECHO FOR GOTO IF ERRORLEVEL IF EXIST IF s1==s2 PAUSE REM SHIFT All Batch commands may be executed with the SYSTEM MASTER shell using batch conventions. Release Date: 21 January, 1991 ------------------------------------------------------------------------- System Master 3.2 Page 7- 1 ------------------------------------------------------------------------- SECTION 7 Batch Command Reference ------------------------------------------------------------------------- 7.2 Batch Command Descriptions 7.2.1 :label The :label command is not a true command, but is instead a tag to which GOTO instructions are routed within a batch file. A 'label' can be any valid label tag as described within your DOS manual. Format: :label Exampl: if NOT EXIST bogusfil.txt GOTO exitbatch del bogusfil.txt :exitbatch cls This example first checks for the existance of a disk file called 'bogusfil.txt'. If the file exists, it is deleted. if it does not exist, processing jumps to the 'exitbatch' label and, and the batch file clears the CRT and terminates normally. 7.2.2 @ The @ command is not a true command, but it is instead a filter which allows batch commands to be executed without displaying the batch commands on the CRT. This command is available starting with version 3.3 DOS. Using this command with earlier versions of DOS will cause SYSTEM MASTER to operate incorrectly. Format: @command 7.2.3 %n The %n command is not a true command but is instead a means by which DOS passes input parameters to command files which use them. 'n' can be any positive integer value in the range 1..9 (SYSTEM MASTER requirement). Other normal DOS Input parameter passing requirements remain in effect. 7.2.4 %string% The %string% command is not a true command but is instead a means by which program variables are passed to and from the DOS environment. 'string' represents any valid DOS Environmental variable assigned using the 'SET' command. Release Date: 21 January, 1991 ------------------------------------------------------------------------- System Master 3.2 Page 7- 2 ------------------------------------------------------------------------- SECTION 7 Batch Command Reference ------------------------------------------------------------------------- 7.2.5 CALL The CALL command allows a batch file to be executed from within another batch file without terminating the first batch file. This command allows batch files to be processed as commands within other batch files. Format: CALL another.bat This command is available starting with version 3.3 DOS. Using this command with earlier versions of DOS will cause SYSTEM MASTER to operate incorrectly. 7.2.6 ECHO The ECHO command has 3 functions: 1) to turn echoing of screen commands ON. 2) to turn echoing of screen commands OFF. 3) to display a text string on the CRT. Format: ECHO ON Format: ECHO OFF Format: ECHO This String Will be Displayed! 7.2.7 FOR The FOR command allows repetitive execution (Looping) of DOS commands. Format: FOR %%variable IN (set) DO command 7.2.8 GOTO The GOTO command allows branching within a batch file. when a GOTO command is encountered in a batch file processing continues at the 'label' specified. Format: GOTO label Exampl: if NOT EXIST bogusfil.txt GOTO exitbatch del bogusfil.txt :exitbatch cls This example first checks for the existance of a disk file called 'bogusfil.txt'. If the file exists, it is deleted. if it does not exist, processing jumps to the 'exitbatch' label and, and the batch file clears the CRT and terminates normally. Release Date: 21 January, 1991 ------------------------------------------------------------------------- System Master 3.2 Page 7- 3 ------------------------------------------------------------------------- SECTION 7 Batch Command Reference ------------------------------------------------------------------------- 7.2.9 IF [NOT] ERRORLEVEL The IF ERRORLEVEL command checks for errorcodes returned from some DOS commands and provides those codes to the batch processor. Exampl: replace bogusfil.txt a:\ IF ERRORLEVEL 2 then goto :exitbatch :exitbatch echo File Not Found This example first attempts to replace a disk file called 'bogusfil.txt'. If ERRORLEVEL is 2, processing jumps to the 'exitbatch' label, and the batch file displays an error message and terminates normally. 7.2.10 IF [NOT] EXIST The IF EXIST command checks for the existance or non- existance of a disk file. Exampl: if NOT EXIST bogusfil.txt GOTO exitbatch del bogusfil.txt :exitbatch cls This example first checks for the existance of a disk file called 'bogusfil.txt'. If the file exists, it is deleted. if it does not exist, processing jumps to the 'exitbatch' label and, and the batch file clears the CRT and terminates normally. 7.2.11 IF [NOT] s1==s2 The IF s1==s2 command compares 2 strings for equality. Exampl: if %1==STEVE ECHO STEVE IS USING THIS SYSTEM 7.2.12 PAUSE The PAUSE command suspends processing of the batch file until the user presses a key. A Remark can be tagged to the PAUSE command for command clarity. Exampl: PAUSE Insert a New Diskette in Drive A 7.2.13 REM The REM command displays remarks from within a batch Release Date: 21 January, 1991 ------------------------------------------------------------------------- System Master 3.2 Page 7- 4 ------------------------------------------------------------------------- SECTION 7 Batch Command Reference ------------------------------------------------------------------------- file. If ECHO is 'OFF' the remarks are NOT displayed. Exampl: REM If ECHO is ON this remark will be displayed 7.2.14 SHIFT The SHIFT command allows input parameters to exceed the DOS limit of 10 (0..9). When the SHIFT command is used, %2 param becomes %1 ... and the last defined parameter becomes nul. Release Date: 21 January, 1991 ------------------------------------------------------------------------- System Master 3.2 Page 7- 5