---
name: "xpachanges"
section: "1"
platform: "linux"
package: "saods9"
version: "3.0.3-1"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/xpachanges"
---

# xpachanges(1)

## NAME

**XPA Changes: Changes For Users from XPA 1.0 and 2.0**

## SYNOPSIS

This document describes changes that will affect users who migrate from XPA 1.0 to XPA 2.0.

## DESCRIPTION

There have been a few changes that affect users who upgrade XPA from version 1.0 to version 2.0.  These changes are detailed below.

- •

  XPA commands no longer have a resolver routine (this is open to negotiations, but we decided the idea was dumb).  For the SAOtng program, this means that you have explicitly specify the fits access point, i.e.,:

  ```
    cat foo.fits ⎪ xpaset SAOtng fits
  ```

  instead of:

  ```
    cat foo.fits ⎪ xpaset SAOtng
  ```

- •

  By default, xpaset, xpaget, etc. now wait for the server callback to complete; i.e., the old -W is implied (and the switch is ignored). This allows support for better error handling.  If you want xpaset, etc. to return before the callback is complete, use -n switch:

  ```
    echo "file foo.fits" ⎪ xpaset -n SAOtng
  ```

- •

  The old -w switch in xpaset and xpaget is no longer necessary (and is ignored), since you can have more than one process communicating with an xpa access point at one time.

- •

  The new -p switch on xpaset means you need not read from stdout:

  ```
    xpaset -p SAOtng colormap I8
  ```

  will send the paramlist to the SAOtng callback without reading from stdin.

## SEE ALSO

See xpa(n) for a list of XPA help pages