Gary wrote:
Good idea, but I think the 'tr' invocation should be:
tr -d '[\n\r]' | tr -s '[[:space:]]' ' '
Michelle chastined:
No, it was a suggestion on this list and it works perfectly.
Your original suggestion stated:
SUB=`formail -zX Subject: |mimedecode |tr -ds '[ntr]' ' '`
Consider the following example:
% echo 'AtrainZ' | tr -ds '[rtn]' ' '
This prints the following:
AaiZ
It turns out that -d and -s don't work well together because
once the character is deleted, it can't be checked for
multiple suppression and translation. Let's drop the -d
and try again:
% echo 'AtrainZ' | tr -s '[rtn]' ' '
A ai Z
Now lets add one tab (using control-v <tab>) after A and two
before the Z, and try a substitution set where the
short hand name for tab uses the \t form.
% echo 'A train Z' | tr -s '[\t]' ' '
A train Z
We can throw \r and \n into that set, but the trailing newline
will become a space:
% echo 'A train Z' | tr -s '[\t\r\n]' ' '
A train Z %
The trailing % above indicates simply that the newline
was replaced with a space.
This is using version 5.2.1 of the GNU implementation of 'tr'.
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