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Join Date: Nov 2007
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Light Poster
Is there any function in shell that enable to check for upper or lower case? i would like to check the input argumnets for upper or lower case.
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Join Date: Dec 2005
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Perhaps use case/esac with a pattern of [a-z]+
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Do not PM me for help; You'll be ignored, or told to learn to read.
Do not ask me if I'm muslim - I'm not. Nor do I care about yours or anyone else's mysticism. Religion is a matrix, take the RED PILL.
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Join Date: Apr 2008
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Light Poster
Try this:
Not exactly sure what you want your end result to be - but this for instance should find uppercase letters - if they are there, convert them to lowercase.
Basically, doing the grep for [A-Z] returns the argument provided if it has capital letters. If this happens, the return code ($?) is 0. If the return code is a 1, no capital letters were in the argument.
You can then run through all arguments.
You can apply this anyway you want though. Grep for [a-z] or [A-Z]. If the return code is 0, then the caps or lowercase were found and you can act accordingly.
function test_upper {
test=`echo $1 | grep [A-Z]`
if [ "$?" = "0" ]; then
#Uppercase letters found.
#translate to lower case:
echo $test | tr '[A-Z]' '[a-z]
else
#letters are all lowercase, return them.
echo $1
fi
}Basically, doing the grep for [A-Z] returns the argument provided if it has capital letters. If this happens, the return code ($?) is 0. If the return code is a 1, no capital letters were in the argument.
You can then run through all arguments.
You can apply this anyway you want though. Grep for [a-z] or [A-Z]. If the return code is 0, then the caps or lowercase were found and you can act accordingly.
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Join Date: Nov 2007
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thanks omrsafetyo!!!
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Join Date: Nov 2007
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Light Poster
i would like to know wheather is there a way thats i can check multiple arguments at the same time? bcos i got 3 args to input then i would like to check this 3 args for uppercase.
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Join Date: Apr 2008
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Light Poster
with my above function:
... or
if you want something simpler.
You could, for instance, rewrite the test_upper function to return a 1 or a 0, depending on whether or not it found uppercase. (You could simple use "echo $?" to "return" this value). Then, when you loop the arguments, you can have a variable that holds whether or not the case you are testing for was found (globally). e.g.
while [ "$*" != "" ]
do
working_arg=`test_upper $1`
if [ "x${working_arg}x" != "xx" ]; then
echo "$working_arg is all lowercase."
fi
shift
donefor arg in "$*" do test_upper $arg done
You could, for instance, rewrite the test_upper function to return a 1 or a 0, depending on whether or not it found uppercase. (You could simple use "echo $?" to "return" this value). Then, when you loop the arguments, you can have a variable that holds whether or not the case you are testing for was found (globally). e.g.
CAPS=0
for arg in "$*"
do
if [ `test_upper $arg` -eq 0 ]
then
CAPS=1
fi
done
if [ $CAPS -eq 1 ]
then
#blah blah blah
fi Last edited by omrsafetyo : Jul 24th, 2008 at 2:55 pm.
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Join Date: Apr 2006
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Junior Poster
Look at the bash guide here. It has examples on checking for upper case.
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