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It seems that the first use of :: instead of REM command was with the purpose to speed up the execution of Batch files in slow machines (ie: floppy disks), but that reason is not a valid justification for the use of double colon since many years ago.Īny line that contain an invalid label will be ignored by the command processor and you may use practically any special character to generate an invalid label. Type in cmd and right click on Command Prompt app. The easiest way to implement the AND/OR operator for non-binary numbers is to use the nested IF condition.
Comment in batch script example how to#
The only logical operator available for conditions is the NOT operator. This book describes and shows how to use the Microsoft-supplied command interpreter cmd.exe and the associated commands, and how to write Windows batch. put a comment in your batch file, the same way denotes a comment in Python. Neither are there any values for TRUE or FALSE. If you would like to supply an argument for the batch file, the piece of VB script has to be altered slightly by changing the two sets of four double quotes to. Heres an example of a simple batch file that runs the two scripts above.
Comment in batch script example full#
For reasons that can't be traced, many people use :: to insert comments in Batch files, but you must be aware that there are several pitfalls in its use that are described in the link given in Koterpillar's answer. The batch language is equipped with a full set of Boolean logic operators like AND, OR, XOR, but only for binary numbers. If you have many lines REM ed out, this may slow. Comments in batch files are usually placed in lines starting with REM (REMarks). The full list of available directives is explained in the man page for the qsub command which is available on the master node of the beowulf. Regardless of the programming or scripting language used, it is always a good idea to insert comments in scripts, explaining what the next lines or block of code is trying to accomplish, how and/or why. The meaning of the directives in the sample script are exampled in a comment line that precedes the directive. A line that start in double colon represent an invalid label that is ignored by the command processor, so it may be used to insert a comment. All of the lines that begin with a PBS are directives to PBS.