Quick One liners to test a string whether or not it is an Integer, Alphanumeric, or Character

*note:
Solaris egrep flag = "-e"
Linux egrep flag = "-E"

To test a string whether or not it is numeric:
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# echo <string> |egrep -E '^[0-9]+$'
# echo $?
*note
1 = not numeric
0 = is numeric
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To test a string whether or not it is all lower case Characters:
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# echo <string> |egrep -E '^[a-z]+$'
# echo $?
*note
1 = not successful
0 = is successful
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To test a string whether or not it is all upper case A-Z characters
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# echo <string> |egrep -E '^[A-Z]+$'
# echo $?
*note
1 = not successful
0 = is  successful
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To test a string whether or not it is all upper case and lower case A-Z characters
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# echo <string> |egrep -E '^[A-Za-z]+$'
# echo $?
*note
1 = not successful
0 = is  successful
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To test a string whether or not it is all alphanumeric characters
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# echo <string> |egrep -E '^[0-9A-Za-z]+$'
# echo $?
*note
1 = not successful
0 = is  successful
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