[GRASS-user] Temporary files in GRASS Script

GRASS GRASS user
1

Greetings all

Following a few questions/emails from Glynn and Antonio regarding GRASS Scripting I have the following question:
What is the main difference between Temporary files creation mentioned in Glynn emails:

**tmp=tmp.myscript.$$**



**And the one used in r.centroid script:**

TMP=$$ 

TMPFILE=`g.tempfile pid=$TMP`



Thanks



Best regards,

Nikos
2

Nikos Dumakis wrote:

Following a few questions/emails from Glynn and Antonio regarding GRASS
Scripting I have the following question:
What is the main difference between Temporary files creation mentioned in
Glynn emails:

*tmp=tmp.myscript.$$*

*
*

*And the one used in r.centroid script:*

TMP=$$

TMPFILE=`g.tempfile pid=$TMP`

The former creates a name with a given format ($$ is the PID of the
shell process running the script).

g.tempfile creates a temporary file at:

  <datbase>/<location>/<mapset>/.tmp/<hostname>/<pid>.<num>

where <num> is chosen such that the name is unique (for g.tempfile, it
will usually be zero; if a process calls G_tempfile() multiple times,
<num> will increment).

Use the former (or something like it) if you want a name for a
temporary map, region, etc. Use the latter if you need a file.

--
Glynn Clements <glynn@gclements.plus.com>