Batch file: IF NOT X%5==X
In a batch file, what is this "IF NOT X%5==X"? I know it's an if statement and %5 is the fifth argument. What does X%5 mean? And what does it mean to compare it to X?
file batch-file
asked Nov 5 '13 at 20:53
user2958006user2958006
1
add a comment |
In a batch file, what is this "IF NOT X%5==X"? I know it's an if statement and %5 is the fifth argument. What does X%5 mean? And what does it mean to compare it to X?
file batch-file
asked Nov 5 '13 at 20:53
user2958006user2958006
1
add a comment |
In a batch file, what is this "IF NOT X%5==X"? I know it's an if statement and %5 is the fifth argument. What does X%5 mean? And what does it mean to compare it to X?
file batch-file
asked Nov 5 '13 at 20:53
user2958006user2958006
1
In a batch file, what is this "IF NOT X%5==X"? I know it's an if statement and %5 is the fifth argument. What does X%5 mean? And what does it mean to compare it to X?
file batch-file
file batch-file
asked Nov 5 '13 at 20:53
user2958006user2958006
1
asked Nov 5 '13 at 20:53
user2958006user2958006
1
asked Nov 5 '13 at 20:53
user2958006user2958006
1
asked Nov 5 '13 at 20:53
user2958006user2958006
1
asked Nov 5 '13 at 20:53
user2958006user2958006
1
1
add a comment |
add a comment |
2 Answers
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I haven't written a DOS batch file for ages :) but I think it resembles a technique used in Unix shell scripts as well: expression X%5==X evaluates to true if the fifth parameter doesn't exist, i.e. there is less then 5 parameters passed to the script. The shell (command.com or whatever) replaces %5 with the parameter, which is an empty string if less then 5 parameters were supplied, which reduces the expression to X==X (so: true).
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
add a comment |
this will check if the 5th argument is defined. E.g. if 5th argument is not defined then you'll have IF NOT X==X => fifth argument is not passed.if it has some value e.g. fifth_arg_value you'll have IF NOT Xfifth_arg_value==X strings will be not equal and you'll know that a value is passed to the 5th argument.
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
I haven't written a DOS batch file for ages :) but I think it resembles a technique used in Unix shell scripts as well: expression X%5==X evaluates to true if the fifth parameter doesn't exist, i.e. there is less then 5 parameters passed to the script. The shell (command.com or whatever) replaces %5 with the parameter, which is an empty string if less then 5 parameters were supplied, which reduces the expression to X==X (so: true).
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
add a comment |
I haven't written a DOS batch file for ages :) but I think it resembles a technique used in Unix shell scripts as well: expression X%5==X evaluates to true if the fifth parameter doesn't exist, i.e. there is less then 5 parameters passed to the script. The shell (command.com or whatever) replaces %5 with the parameter, which is an empty string if less then 5 parameters were supplied, which reduces the expression to X==X (so: true).
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
add a comment |
I haven't written a DOS batch file for ages :) but I think it resembles a technique used in Unix shell scripts as well: expression X%5==X evaluates to true if the fifth parameter doesn't exist, i.e. there is less then 5 parameters passed to the script. The shell (command.com or whatever) replaces %5 with the parameter, which is an empty string if less then 5 parameters were supplied, which reduces the expression to X==X (so: true).
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
I haven't written a DOS batch file for ages :) but I think it resembles a technique used in Unix shell scripts as well: expression X%5==X evaluates to true if the fifth parameter doesn't exist, i.e. there is less then 5 parameters passed to the script. The shell (command.com or whatever) replaces %5 with the parameter, which is an empty string if less then 5 parameters were supplied, which reduces the expression to X==X (so: true).
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
answered Nov 5 '13 at 20:58
piokucpiokuc
17.5k64680
17.5k64680
add a comment |
add a comment |
this will check if the 5th argument is defined. E.g. if 5th argument is not defined then you'll have IF NOT X==X => fifth argument is not passed.if it has some value e.g. fifth_arg_value you'll have IF NOT Xfifth_arg_value==X strings will be not equal and you'll know that a value is passed to the 5th argument.
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
add a comment |
this will check if the 5th argument is defined. E.g. if 5th argument is not defined then you'll have IF NOT X==X => fifth argument is not passed.if it has some value e.g. fifth_arg_value you'll have IF NOT Xfifth_arg_value==X strings will be not equal and you'll know that a value is passed to the 5th argument.
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
add a comment |
this will check if the 5th argument is defined. E.g. if 5th argument is not defined then you'll have IF NOT X==X => fifth argument is not passed.if it has some value e.g. fifth_arg_value you'll have IF NOT Xfifth_arg_value==X strings will be not equal and you'll know that a value is passed to the 5th argument.
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
this will check if the 5th argument is defined. E.g. if 5th argument is not defined then you'll have IF NOT X==X => fifth argument is not passed.if it has some value e.g. fifth_arg_value you'll have IF NOT Xfifth_arg_value==X strings will be not equal and you'll know that a value is passed to the 5th argument.
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
answered Nov 5 '13 at 20:55
npocmakanpocmaka
42.1k1187132
42.1k1187132
add a comment |
add a comment |
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