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<H1><A NAME="SECTION001250000000000000000"></A>
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4.5 Command Line History
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<P>
<A NAME="tex2html240"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> programs ``remember'' the standardized command line options
(See previous section) given during their previous invocations
and this provides a shorthand notation for complex options.
For example, if a basemap was created with an oblique Mercator
projection, specified as
<P>
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<P>
<TT>-Joc190/25.5/327/56/1:500000</TT>
<BR>
<P>
then a subsequent <A NAME="tex2html241"
HREF="../psxy.html"><I><B>psxy</B></I></A><A NAME="4691"></A> command to plot symbols only needs
to state <B>-J</B>o in order to activate the same projection.
Previous commands are maintained in the file <U>.gmtcommands</U>,
of which there will be one in each directory you run the programs
from. This is handy if you create separate directories for
separate projects since chances are that data manipulations
and plotting for each project will share many of the same options.
Note that an option spelled out on the command line will always
override the last entry in the <U>.gmtcommands</U> file and,
if execution is successful, will replace this entry as the
previous option argument in the <U>.gmtcommands</U> file.
If you call several <A NAME="tex2html242"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> modules piped together then <A NAME="tex2html243"
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guarantee that the <U>.gmtcommands</U> file is processed
in the intended order from left to right. The only guarantee
is that the file will not be clobbered since <A NAME="tex2html244"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> now uses advisory
file locking. The uncertainty in processing order makes the use
of shorthands in pipes unreliable. We therefore recommend that you
only use shorthands in single process command lines, and spell out
the full command option when using chains of commands connected with
pipes.
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<ADDRESS>
Paul Wessel
2001-04-18
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