Question about referring a word in a command output
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Question about referring a word in a command output
I am learning shell scripting now.
In Unix, excuting the following commands:
set d=`date`
echo "Today is $d[1]"
You will get the first word of DATE command output by using $d[1], which is the date.
But in linux (I am using redhat 4.0 enterprise), system doesn't recognize $d[1] referring to the first word, but showing like " Today is Sat May 14 09:50:34 EDT 2005[1] ".
So I am wondering what is the correct usage of referrence to a word in a wordlist, like the above situation.
In bash you could do the same thing:
d=(`date`)
echo "Today is ${d[0]}"
The variable d is an array.
${#d[@]} will return the number of elements in the array.
Arrays in bash are like sparse arrays. You could have d[0], d[1], d[2], d[10] elements.
In this case, ${#d[@]} would return 4 rather than eleven. Also, the indexes are 0 based.
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