for loop error....
 

Conider the following code..

1 #!/bin/bash
2
3 for tst in I don't know if this'll work
4 do
5 echo "word :: $tst"
6 done

Why the o/p is so amgious ?

word :: I
word :: dont know if thisll
word :: work

The single quotes in don't and this'll constitute a single quoted phrase withing quotes which prevent the shell from parsing the phrase.

Try this instead:
for tst in I don\'t know if this\'ll work

using the backslash to escape the single quotes.

word :: I
word :: don't
word :: know
word :: if
word :: this'll
word :: work

I know .... but why the op is so illogical ??

http://www.linuxtopia.org/online_boo...uotingvar.html

Just about all programming langs have an equivalent (often the same) rule to allow 'values' to have spaces or other (normally) special chars in them.

Actually it's quite logical. The shell interpret the string
as
where the part in red is not split into fields (due to the single quotes, as already mentioned). The string concatenation do the rest.

The blank spaces that actually act as field separators are shown here: