Help needed in excluding certain word patterns

Shell Programming and Scripting
1

Hi,

I need help with following. I need to exclude words that match following patterns
a. more than length 4 (example SBRAP)
b. contains mixture uppercase and lower case regardless of the length (example GSpD)

File contains

COFpC
MCHX
SP
SNFCA
GEH
SBRAP
DGICA
JPMpE
WFCpP
GSpD
AXL
RGS
PREpD
EVN
CNOB
CUBI
TOWN
GSpD
RGS
EVN
CNOB
CUBI

Thanks
jak

2 
perl -nle 'print unless (length > 4 or (/[A-Z]/ and /[a-z]/))' jakSun8.file
MCHX
SP
GEH
AXL
RGS
EVN
CNOB
CUBI
TOWN
RGS
EVN
CNOB
CUBI
3

Thanks Aia but i don't have perl installed on my system. Any awk or sed solution please?

Thanks,
jak

4

Any attempt from your side, please?

awk 'length <=4 && !(/[a-z]/ && /[A-Z]/)' file

or

awk 'length <=4 && !(tolower($0) == $0 || toupper($0) == $0)' file
5

Thanks RudiC. I am not well versed in scripting language but appreciate folks like you who help out generously on daily basis.

Thanks,
jak

6

Sed version:
--

sed '/.\{5\}/d; /[a-z][A-Z]/d; /[A-Z][a-z]/d' file

or (better)

sed '/.\{5\}/d; /[[:lower:]][[:upper:]]/d; /[[:upper:]][[:lower:]]/d' file

--
If we only want to print either only lower case or only uppercase (not allowing any other characters)

sed -n '/^[A-Z]\{1,4\}$/p; /^[a-z]\{1,4\}$/p' file

or (better)

sed -n '/^[[:upper:]]\{1,4\}$/p; /^[[:lower:]]\{1,4\}$/p' file

or grep:

grep -Ee '^[[:upper:]]{1,4}$' -e '^[[:lower:]]{1,4}$' file