Here is an example input file test.txt:

D,642,0642,UBF,EVL,,M,,S,S,FOREVER,213,213,
D,642,0642,UBF,EVL,,M,,S,S,QSP-U=C,4,4,
D,642,0642,UBF,EVL,,M,,S,S,123456,4,4,
D,642,0642,UBF,EVL,,M,,S,S,12345,4,4,
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where the fields are separated by a comma. For example, FOREVER above is the eleventh field. This is just a guess based on your description. Please correct me if this is wrong.

Given the above assumption, the following one-liner:

perl -nlaF/,/ -e 'length($F[10]) < 7 and print' test.txt
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prints to stdout:

D,642,0642,UBF,EVL,,M,,S,S,123456,4,4,
D,642,0642,UBF,EVL,,M,,S,S,12345,4,4,
[download]

i.e. prints out only those lines where the eleventh field is less than seven characters in length.

See perlrun for details of the -a and -F command line switches to perl.

Once you are happy that works and meets the spec. you could add the -i switch to auto-edit the file.

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