The return value of "which"

Dear OS Xers,
Subject: Script writing. The "which" command that that returns the location of a program.
I'm writing a script that, at the beginning and before the main body of the script, checks that the commnds it uses are installed on the system. I was hoping to use "which" to do this, specifically checking the return value thus:
which ls bash gaga >/dev/null # list of needed functions
if [ $? != 0 ] # cause a rumpus.
However I find that the return value is 0=OK even if which can't find some of the programs.
Now, I can get around this for apple by writing a grep script that checks for "^no " in the std output. However I suspect that apple's implementation is non-standard, and that correctly "which" is meant to return an error value in this case. If this is the case then correctly the thing to do is not to script for apple (I'm only writing for my own, hopefully up-to-date systems!) but to correct the apple implementation.
I want to check two things with you. First, I have no real basis for saying that apple's implementation is non-standard. I only know that I've checked other systems and man pages and all that I've come across so far indicate that an error is returned. Is there some more authoratitive method of checking what the behaviour should be? Some standards body? Secondly, I realise that this is small fry but I'd be more than happy to update apple's code if they are likely to approve the change. If that's the case can someone please show me where I can find the relevant source code?
Regards, Max
http://unixhelp.ed.ac.uk/CGI/man-cgi?which
RETURN VALUE
Which returns the number of failed arguments, or -1 when no `program-
name' was given.
Debian implementation:
EXIT STATUS
0 if all specified commands are found and executable
1 if one or more specified commands is nonexistent or not executable
2 if an invalid option is specified
I'll have a chance to check the implementation on some solaris machines next week.
As you can see, they're not consistent in terms of what error they return, but they do all return a non-zero value.
Mac OS X (10.4.4)

The fink version ( /sw/bin/which ) does what you're looking as well--it doesn't recognize aliases though. tcsh and OS X's csh (which happens to be a duplicate of the tcsh executable) do recognize aliases.
I guess the script (/usr/bin/which) is there to either echo one's path when a command's not found or give a different response to aliases. Otherwise one could change the script to:
#! /bin/csh -f
which $arg
exit($?)
Note the added -f...this prevents aliases from being set by csh when they don't exist in the bash shell. But neither script will recognize aliases set in a bash shell.
TiBook G4 Mac OS X (10.3.9)

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Edited by: Straitsfan on Sep 29, 2009 2:03 PM

Straitsfan wrote:
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Straitsfan wrote:
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Parameter 5: An op
tional Boolean that specifies whether to ignore character case when searching. The default is False.
Parameter 6: An optional number that specifies the maximum number of occurrences of substring to replace. A value of -1 signals the function to replace all occurrences of the substring. The default is -1.
Parameter 7: An optional Boolean that specifies whether to search the string in reverse. The default is False. If you pass True, the start index passed to parameter 3 specifies the zero-based index from the end of the string of the character at which to begin searching in reverse.
Parameter 8: An optional number in which the function stores the number of substrings that it replaced.
Returns: The modified string.
Scott Richardson
National Instruments

How to get the return values from a web page

Hi all :
how to get the return values from a web page ? I mean how pass values betwen webflow and web page ?
thank you very much
Edited by: jingying Sony on Apr 15, 2010 6:15 AM
Edited by: jingying Sony on Apr 15, 2010 6:18 AM

Hi,
What kind of web page do you have? Do you have possibility to for example make RFCs? Then you could trigger events (with parameters that could "return" the values) and the workflow could react to those events. For example your task can have terminating events.
Regards,
Karri

Job scheduling error : The return value was unknown. The process exit code was -1073741819. The step failed.

I am working in Sqlserver 2008 R2, SSIS 64 bit version
I am getting the below error while scheduling the job in the development server Database.
The return value was unknown. The process exit code was -1073741819. The step failed.
The SSIS front end execution runs fine.
Have anyone faced this issue before?

Hi Venkat,
If you already changed to 64bit and still doesn't work then create proxy account..
To create a proxy account
In Object Explorer, expand a server.
Expand SQL Server Agent.
Right-click Proxies and select New Proxy.
On the General page of the New Proxy Account dialog, specify the proxy name, credential name, and
description for the new proxy. Note that you must create a credential first before you create a proxy if one is not already available. For more information about creating a credential, see How
to: Create a Credential (SQL Server Management Studio) or CREATE CREDENTIAL (Transact-SQL).
Check the appropriate subsystem for this proxy.
On the Principals page, add or remove logins or roles to grant or remove access to the proxy account.
Thanks

How to store the return value from a select list in page item ?

I'm sorry, I'm sure you will all flame me for this (and its long too :-(. I'm still trying to pick this up and havn't had time to read manual and this forum and up against the clock (as usual), but this must be something thats simple to do, otherwise why have 2 cols on LOV (display text and return value.
normal kind of thing - master /detail, a master table and a detail table, master.id is PK in master, master.name is the name of the master item. detail.id is pk in detail, detail.mid is foreign key to master.id. I have a tabular report that displays a join of cols from master and detail, with 2 cols being links, one is a link on master.name, that passes master.id to page P1 and it displays a row from master. The other col displays detail.name and passes detail.id to page P3, P3 displays a row of the detail table.
I want to populate a LOV with possible master.name values, but display the name of the current P3_MID value (from detail.mid). Then a user can pick a different master and it needs to update P3_MID so on submit it updates the row.
I just can't seem to see in the manual how you can specify where the return value on a LOV goes?
As I said, sorry for long post and not having had time to read docs correctly - someone just point me at the subject matter somewhere, please.

Sorry, I was trying to be to complex and obviously APEX is just too damn cleaver - I figured out how this works - basically APEX pulls the LOV and then matchs the mid to it to display the correct name - simple and easy - just me making it difficult

How to set the returned value of CFL in a matrix

dear all,
I got a matrix binded to a DataSource and two CFLs are in this matrix. The codes for handling AfterChooseFromList is as following. It works almost fine. But when a docoment containing more than two
rows in the matrix and I reselect the CFL cell values more than two times, an error occured sometimes, not everytime. The error message is "This entry already exists in the following tables @CYW_PRROW [Message 131-183]"
I have tried to find out what kind of situation to cause this error, but still in the mud.
Can anybody give me some suggestion? Thanks.
Public Sub OnAfterChooseFromList_Matrix(ByVal pVal As SAPbouiCOM.ItemEvent)
        Dim ActionSuccess As Boolean = pVal.ActionSuccess
        Dim oform As SAPbouiCOM.Form = SBO_Application.Forms.Item(pVal.FormUID)
        Dim oitem As SAPbouiCOM.Item = oform.Items.Item("mtx_0")
        Dim omatrix As SAPbouiCOM.Matrix = CType(oitem.Specific, SAPbouiCOM.Matrix)
        Dim oDataTable As SAPbouiCOM.DataTable
        oDataTable = pVal.SelectedObjects
        Dim val As String
        Try
            val = oDataTable.GetValue(0, 0)
        Catch ex As Exception
        End Try
        omatrix.GetLineData(pVal.Row)
        oform.DataSources.DBDataSources.Item("@CYW_PRROW").Offset = pVal.Row - 1
        If pVal.ColUID = "col_0" Then
            Try
                oform.DataSources.DBDataSources.Item("@CYW_PRROW").SetValue("U_PRItemCode", pVal.Row - 1, CStr(val))
            Catch ex As Exception
                SBO_Application.MessageBox(ex.Message)
            End Try
        Else
            Try
                oform.DataSources.DBDataSources.Item("@CYW_PRROW").SetValue("U_PRSupp", pVal.Row - 1, CStr(val))
            Catch ex As Exception
                SBO_Application.MessageBox(ex.Message)
            End Try
        End If
        omatrix.SetLineData(pVal.Row)
        If pVal.FormMode = "1" Then
            oform.Mode = SAPbouiCOM.BoFormMode.fm_UPDATE_MODE
        End If
    End Sub
Another quesion, can I assign the returned value of CLF directly to the cell?

Hello Chao-Yi Wu,
I don't have a real solution for you - just a few comments:
1. At
        Try
            val = oDataTable.GetValue(0, 0)
        Catch ex As Exception
        End Try
I would add
        Try
            if oDataTable Is Nothing Then Exit Sub ' If the User cancels the CFL
            val = oDataTable.GetValue(0, 0)
        Catch ex As Exception
        End Try
2. At
   If pVal.ColUID = "col_0" Then
I would make the branch by the pVal.ChooseFromListUID instead of the ColUID
and the 2nd not with "Else" but with "Else If ....."
3. It may work with EditText.String/Value of a cell but I never do that because of performance-reasons.
I always do it the same way as you in principle - I don't really know what the problem is.
4. Maybe some unique indexes on your table (although this should give an error at the update and not at CFL when "the unique-law is broken"...)?
Sorry - that's all for the moment.
Cheers,
Roland

The return value of "which"

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