I always endeavour to answer the question, and the actual problem. Seeing your ps actually encouraged me to suggest more awk things.
It may be the complete lack of a newline that causes bc to fail, too. echo will add one on the end, but just piping it in would end up with nothing. Many commands are picky about lines without newlines -- some versions of awk and sed, for instance.
I hope I did not sound ungrateful about the PS, I certainly didn't mean to (I did add a smiley), I just assumed you'd missed it.
Yes it is the lack of a newline causing bc the problem, see my reply to methyl.
---------- Post updated at 06:43 PM ---------- Previous update was at 06:42 PM ----------
Quote:
Originally Posted by vgersh99
how about:
Code:
getip test | grep -o "^[0-9.]*" | tr "\n\r\f" "+" | sed 's/+$/&0/' | bc
Nope same problem, it's the lack on newline.
---------- Post updated at 06:49 PM ---------- Previous update was at 06:43 PM ----------
Quote:
Originally Posted by methyl
Explanation of the error.
Your "tr" command strips out all line terminators (\n) for some unknown reason and converts them to "+" signs. My version of "sed" will not process lines without a line terminator, but yours appears to work (to my surprise).
The "bc" program fails because the input stream is not terminated with a linefeed character (\n).
When you "echo" the variable $var1 the "echo" statement appends a linefeed character (\n).
Btw. The unix standard version of "tr" will not translate three different characters into one. The length of the translate list must be the same both sides.
In your script this would only matter if there were carriage-return or form-feed characters in the line (which there are clearly not).
The reason why I'm translating the newlines to "+" is to get the "+"s in between the numbers for input into bc.
Yes, you are right the bc works fine once there's a newline appended.
Thanks for the tr info, amended my code.
Fully working and fully understood:
Code:
$ getip test | grep -o "^[0-9.]*" | tr "\n" "+" | sed "s/\(.*\)+/\1\n/" | bc
3.589
EDIT: vgersh99's sed code is more elegant than mine, slightly modified to replace the final '+' with a new line and we have:
getip test | grep -o "^[0-9.]*" | tr "\n" "+" | sed "s/+$/\n/" | bc
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Seeing your ps actually encouraged me to suggest more awk things.