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Please re-read the question then answer it. The dsenv script has nothing to do with it.

There is a script for cleaning up defunct processes. I can't recall what it's called at the moment, but a search of DSXchange will probably find it.

Seriously, though, this is way too vague a question. Is it an interview question? As with any other programming tool, error handling is about anticipating errors of various kinds and implementing mechanisms that can intercept and, hopefully, ameliorate them. Prevention is an even better approach.

When you make a mistake in a typescript the editor marks it, usually with a red pen or pencil. That's error handling of a kind.

Filter command cat filepath | tr -d \" in Sequential File stage to get rid of the double quotes.

If the data contain double quote characters, prefer a sed or awk command to replace all instances of "|" with | in the filter command.

Does project blah-blah have a relative pathname set as its TMPDIR environment variable? (These are the environment variables accessed via Administrator client and stored in the DSParams file.)

Always answer "NO" to the question about creating a UniVerse account. It means that you're not attached where you thought you were. Does telnet prompt for the name of an account? If so, give it one, even if it's UV. Otherwise change your Windows home folder on the server to one that is an ...

But cat will work, as noted. Or, particularly if the first check is done in a server job (which I recommend as best practice when only one row is being processed), the count can be placed in that job's user status area and retrieved using the $UserStatus activity variable of the Job activity.

You can not use node pools (or disk pools) until the active configuration file mentions those pools.

Is this the XMETA database (or IADB or QSDB) or a database containing your organization's data?

Welcome aboard. How do you expect juancho to know what U (one of our other posters) did? Please strive for a professional standard of written English on DSXchange. It is a web site, not a mobile telephone, so there is no need for SMS-style abbreviations. Many of our posters (and lurkers) do not have...

You can also have side-by-side installations if you prefer. At least one must be an "-itag" installation.

Check the value of the parameter, simply by interrogating it, perhaps in a trigger expression that leads to a Terminator activity.

Read all about the EXECUTE statement (and, while you're at it, the DSExecute subroutine) in the DataStage BASIC manual. The EXECUTE statemet includes clauses for capturing both the output and the exit status of the executed command.