[Discuss] Please help with a BASH puzzle

[David Kramer]

rIs it base 36 then?

One way to build the list of expected values is bash brace expansion, 
where {a,b,c}{1,2,2} will output all combinations of those sets.  Here's 
an example going from 1 to 4 in 4 digits, but you can see how you would 
do this with 0-9 then A-Z in each of the 4 sets:

$ echo {1,2,3,4}{1,2,3,4}{1,2,3,4}{1,2,3,4}
1111 1112 1113 1114 1121 1122 1123 1124 1131 1132 1133 1134 1141 1142 
1143 1144 1211 1212 1213 1214 1221 1222 1223 1224 1231 1232 1233 1234 
1241 1242 1243 1244 1311 1312 1313 1314 1321 1322 1323 1324 1331 1332 
1333 1334 1341 1342 1343 1344 1411 1412 1413 1414 1421 1422 1423 1424 
1431 1432 1433 1434 1441 1442 1443 1444 2111 2112 2113 2114 2121 2122 
2123 2124 2131 2132 2133 2134 2141 2142 2143 2144 2211 2212 2213 2214 
2221 2222 2223 2224 2231 2232 2233 2234 2241 2242 2243 2244 2311 2312 
2313 2314 2321 2322 2323 2324 2331 2332 2333 2334 2341 2342 2343 2344 
2411 2412 2413 2414 2421 2422 2423 2424 2431 2432 2433 2434 2441 2442 
2443 2444 3111 3112 3113 3114 3121 3122 3123 3124 3131 3132 3133 3134 
3141 3142 3143 3144 3211 3212 3213 3214 3221 3222 3223 3224 3231 3232 
3233 3234 3241 3242 3243 3244 3311 3312 3313 3314 3321 3322 3323 3324 
3331 3332 3333 3334 3341 3342 3343 3344 3411 3412 3413 3414 3421 3422 
3423 3424 3431 3432 3433 3434 3441 3442 3443 3444 4111 4112 4113 4114 
4121 4122 4123 4124 4131 4132 4133 4134 4141 4142 4143 4144 4211 4212 
4213 4214 4221 4222 4223 4224 4231 4232 4233 4234 4241 4242 4243 4244 
4311 4312 4313 4314 4321 4322 4323 4324 4331 4332 4333 4334 4341 4342 
4343 4344 4411 4412 4413 4414 4421 4422 4423 4424 4431 4432 4433 4434 
4441 4442 4443 4444

I do like Rich's idea of creating the ideal file once, possibly using 
this technique or really in any programming language, and just doing a 
diff.  If you don't want to do that, though, you could use this 
technique in an outer for loop, and for each one, read a line from the 
file under test, and if the line doesn't match the expected value, 
report the error and loop until you see the next match.

On 8/23/19 7:17 PM, Bill Horne wrote:
> David,
>
> Thank you for your suggestion, but they are not only number, but alpha 
> values too.
>
> Sorry, though: I chose poor examples.  The file can contain any digit 
> 0-9, and any alpha A-Z. There are no punctuation marks and no white 
> space.
>
> Sorted values range from 0000 to ZZZZ.
>
> HTH.
>
> Bill
>
>
> On 8/23/2019 6:51 PM, David Kramer wrote:
>> Are these hex numbers?  bc can convert hex to decimal and do hex 
>> math.  The hard part is calculating the next value, and here's an 
>> example of doing that.
>>
>> nextValue=`echo "obase=16; ibase=16; ${lastValue} + 1" | bc`
>>
>> Then all you need to do is compare whether the next line you read is 
>> equal to nextValue.
>>
>>
>> On 8/23/19 6:32 PM, Bill Horne wrote:
>>> Thanks for reading this: I appreciate your time.
>>>
>>> I'm trying to do something that should be very easy to do, and yet I 
>>> can't remember how to do it, and I'm asking for help.
>>>
>>> I have an alpha-numeric, sorted file, that looks like this:
>>>
>>> 01AA
>>>
>>> 01AB
>>>
>>> 01AC
>>>
>>> 01AE
>>>
>>> 01AF
>>>
>>> .. etc.
>>>
>>> I'm trying to remember what BASH utility, script, or  command would 
>>> flag the missing value (in this case, "01AD"). There are, of course, 
>>> any number of ways to program a solution, but I can't remember which 
>>> of the BASH utilities will do it. All suggestion welcome, and thanks 
>>> in advance.
>>>
>>> Bill Horne
>>>
>>> _______________________________________________
>>> Discuss mailing list
>>> Discuss at blu.org
>>> http://lists.blu.org/mailman/listinfo/discuss
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