---
name: "halshow"
section: "1"
platform: "linux"
package: "linuxcnc-uspace"
version: "1:2.9.4-2+deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/halshow"
---

# halshow(1)

Show HAL parameters, pins and signals

## NAME

halshow - Show HAL parameters, pins and signals

## SYNOPSIS

**halshow \[Options\] \[watchfile\]**

## OPTIONS

           \--help    (help)\
            \--fformat format\_string\_for\_float\
            \--iformat format\_string\_for\_int\
            \--noprefs don't use preference file to save settings

For format see  ⟨https://www.tcl.tk/man/tcl8.6.11/TclCmd/format.html⟩

Example:  "%.5f" displays a float with 5 digits right of the decimal point

## DESCRIPTION

**halshow** creates a GUI interface to view and interact with a running HAL session.  It is documented in the PDF and HTML docs much more completely than is possible in a manpage: ⟨http://linuxcnc.org/docs/html/hal/halshow.html⟩

## SEE ALSO

**LinuxCNC(1)**

Much more information about LinuxCNC and HAL is available in the LinuxCNC and HAL User Manuals, found at /usr/share/doc/LinuxCNC/.

## HISTORY

- LinuxCNC 2.9:

  \- Added buttons for pin/parameter/signal manipulation\
   \- Added menu entries for setting update interval, adding manually\
   \- Added right-click menu for copy, set, unlink pin and remove from view

## BUGS

None known at this time.

## AUTHOR

Raymond E. Henry

## REPORTING BUGS

Report bugs at https://github.com/LinuxCNC/linuxcnc/issues

## COPYRIGHT

Copyright © 2020 andypugh.\
 This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.