Shell Programming and Scripting

can you explain please

He wants to count the number of "distinct" (i.e. unique) words... e.g. if the words were "Blah yak blah blah yak rhubarb" the answer would be 3 ("blah yak rhubarb").

Code:

tr -s '[:space:]' '\n' < infile | sort -u | wc -l

The way the question is posed it looks like homework. But I cannot be sure. Don't post homework questions, please.

With that limitation (grep, tr, sort, wc) definitely looks like homework.

If you could use xargs:

Code:

xargs -a FILENAME -n 1|sort -u|wc -l

My friends this is not HW it's just challenge between my friends
Anyway i try to solve it:

grep -c | sort -u test.txt | tr -d "\t \v \f [unct:] [:upper:] "

but actually i don't know how i can sort this commands ?? so anybody can correct it for me.

Thanks everyone replayed to me.

What's the grep for? It doesn't do anything without at least a regular expression to search for, and usually also a file name.

Jim' solution already solved your problem; did you really not try the solutions posted here?

Code:

# Change any whitespace into a newline
tr '\t\v\f ' '\n' <test.txt |
# sort, deleting any repeated occurrences of the same word
sort -u |
# count how many we have
wc -l

This is very much a staple of introductory Unix text books; I'd recommend that you finish the first chapter before you accept any more challenges.

Something like this:

Code:

for word in $(cat $filename)
do
echo $word|tr -d [:punc:]|tr [:upper:] [:lower:] 
done|sort |uniq -c

Just like Annihilannic suggested.