Pipe K Values

[Lane Stefano]

Butthere's no point - your variable assignments may not last! A pipeline may spawn a subshell, where the environment is inherited by value, not by reference. This is why read doesn't bother with input from a pipe - it's undefined.

There's a fairly steep learning curve with perl (or I guess any of these languages) but you'll find it a lot easier in the long run if you want to do anything but the simplest of scripts. I'd recommend the Perl Cookbook and, of course, The Perl Programming Language by Larry Wall et al.

Without the braces, the assignment to test (after the pipe) is in one shell, and the echo "test=$test" is in a separate shell which doesn't know about that assignment. That's why you were getting "test=" in the output instead of "test=hello world".

Because I fall for it, I would like to drop a note.I found this thread, because I have to rewrite an old sh scriptto be POSIX compatible.This basically means to circumvent the pipe/subshell problem introduced by POSIX by rewriting code like this:

But the latter does not behave the same on empty input.With the old notation the while loop is not entered on empty input,but in POSIX notation it is!I think it's due to the newline before EOF,which cannot be ommitted.The POSIX code which behaves more like the old notationlooks like this:

In most cases this should be good enough.But unfortunately this still behaves not exactly like the old notationif some_command prints an empty line.In the old notation the while body is executedand in POSIX notation we break in front of the body.

I think you were trying to write a shell script which could take input from stdin.but while you are trying it to do it inline, you got lost trying to create that test= variable.I think it does not make much sense to do it inline, and that's why it does not work the way you expect.

The questions is how to catch output from a command to save in variable(s) for use later in a script. I might repeat some earlier answers but I try to line up all the answers I can think up to compare and comment, so bear with me.

is valid in Korn shell because ksh have implemented that the last command in a piped series is part of the current shell ie. the previous pipe commands are subshells. In contrast other shells define all piped commands as subshells including the last.This is the exact reason I prefer ksh.But having to copy with other shells, bash f.ex., another construct must be used.

The relative roughness of a pipe is its roughness divided by its internal diameter or e/D, and this value is used in the calculation of the pipe friction factor, which is then used in the Darcy-Weisbach equation to calculate the friction loss in a pipe for a flowing fluid.

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From what I understand, this is my assignment. My parent goes through a for loop checking an integer value "i" for a certain operation, increases a count variable, and saves value into an array. After each check my parent should pass an integer value, "i" to my child through a pipe. My child then uses that integer value, does some check on the value, and should increase a count variable, and save the result in a [shared?] array. Eventually; the child should return it's final count to the parent, who then prints out the two counts, and the "Shared" array.

-> I'm not sure I need to have a shared array or to save the results at all. I may only need the counts - the homework was ambiguous and I'm awaiting a response from the professor. Also; can I even do a shared array between processes? It sounds like a start of some problem to me.

-> Here are my questions:One; how do I use pipes for integers? I've only seen them for character arrays and previous answers don't seem to think this is possible or legal..? I'm not sure. There was no resolution that I could find on it.

-> How do I use a unidirectional pipe to pass integers to a child? And have the child return something? I'm not sure how I'm able to... differentiate between the two pipes. I do "know" [or think I know] that I have to close one unused portion of each pipe to avoid "Some vague problem".

This is about as lame (and no error checking, btw) a sample as I can muster for using a pipe to send int from a parent to a child process, where the child was launched from fork(). It gets more complicated (obviously) for sending and receiving data, but i can't do everything for you. This just forks and waits for an int (actually, the number of bytes that are used by an int) from the child.

Trying to change pipe color based off a tag value, my experimental tag is a voltage tag averaging around 480. The Pipe fill color looks to be changing in the Perspective property editor correctly when I set some experssion logic, when checking true condition, if(tag>0,toColor("red")), and then checking false if(tac>490,toColor("black")), see code and images. However, the pipe view is not changing within my coordinate container. Please advise. I do have a broken icon next to the fill property stating "The value of this property will not be saved with the view".

@sebastien_ng & @pturmel - Functions. I am definately looking into using funcitons, but I still need more experience to deploy them in my project. Right now, our system is so newbie that I just need simple graphics and navigation to deploy a draft and use case to get more funding for equipment at locations on our facility that we need visibility. I will reach out with any Function questions at a later date. Thank you for responding with suggestions, they are noted!!

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2. Certain rows where the fields have missing values at the end when loading the pipe delimited we saw that since there are many missing values at the end, so while conversion, it's not adding pipes for them and thus number of obs in those rows becoming less than what it should be.

The provided data step is just for testing purposes to show that proc export in combination with a filename statement containing LRECL can actually deal with really wide data. It uses an array and do loops in a data set to generate fake date using just a few lines of SAS code. And no, you don't need it in your program.

If you want to use the number of variables in your input table to calculate the needed LRECL so it can contain all the data values and a delimiter, then you can use data step functions to retrieve the number of variables and the logical record length of the data, calculate what you think would be the number of bytes needed, store it in a SAS macro variable and use that SAS macro variable in your filename statement. That code would look something like this:

With 10k vars you need 10k chars to separate variables, leaving only 2 chars per variable for the values, because afaik the text-buffer can only handle up to 32k chars. Having that many variable could be an indicator, that the data should have been re-designed before trying anything else.

If you send an antique off to be appraised, you should be willing to pay for the service, and the appraiser must be objective, working solely for the fee. If you turn it over to an active collector or an active merchant, he may price it low and make you an offer to buy it from you. If the collector or merchant charges you for the appraisal he is also a thief.

With pipes there are no such objective appraisers. The pipe universe is such a small coterie that no one is part of it without also being invested in it. No one has documented the history of pipe prices, certainly not I. I have documented the physical features of Peterson pipes but I have not over the years kept track of prices I paid for or sold them.

I'm trying to create a report with multi-valued parameter, using a pipe delimited string. The stored procedure runs as expected. The report runs fine if I choose only one parameter but, returns no values if I choose multiple values. Any thoughts?

Multi-value parameters are stored as an array of the chosen values. Before reporting services passes the array to a procedure it concatenates the values into a comma-delimited string, by default, since SQL Server doesn't have any array-types.

As splitters go this is about as bad as they come. The performance of a loop based splitter is awful. Add to that the usage of a multi-statement table valued function and you have a performance time bomb on your hands. This works fine on really small sets but it will NOT scale well at all. For about the fastest splitter outside of CLR take a look in my signature for a much better approach to splitting strings. If you truly can't fit the delimited list in under 8,000 characters you can view this link. -sql-queries/split-strings There you will find several other options that are also much better than looping.

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