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PROGRAM:

NAME


gmt_shell_functions.sh - Practical functions to be used in GMT bourne shell scripts

SYNOPSIS


gmt_init_tmpdir

gmt_remove_tmpdir

gmt_clean_up [prefix]

gmt_message message

gmt_abort message

gmt_get_nrecords file(s)

gmt_get_ndatarecords file(s)

gmt_get_nfields string

gmt_get_field string

gmt_get_region file(s) [options]

gmt_get_gridregion file [options]

gmt_get_map_width -R -J

gmt_get_map_height -R -J

gmt_set_psfile file

gmt_set_pdffile file

gmt_set_framename prefix framenumber

gmt_set_framenext framenumber

DESCRIPTION


gmt_shell_functions.sh provides a set of functions to Bourne (again) shell scripts in
support of GMT. The calling shell script should include the following line, before the
functions can be used:

. gmt_shell_functions.sh

Once included in a shell script, gmt_shell_functions.sh allows GMT users to do some
scripting more easily than otherwise. The functions made available are:

gmt_init_tmpdir
Creates a temporary directory in /tmp or (when defined) in the directory specified
by the environment variable TMPDIR. The name of the temporary directory is returned
as environment variable GMT_TMPDIR. This function also causes GMT to run in
'isolation mode', i.e., all temporary files will be created in GMT_TMPDIR and the
gmt.conf file will not be adjusted.

gmt_remove_tmpdir
Removes the temporary directory and unsets the GMT_TMPDIR environment variable.

gmt_cleanup
Remove all files and directories in which the current process number is part of the
file name. If the optional prefix is given then we also delete all files and
directories that begins with the given prefix.

gmt_message
Send a message to standard error.

gmt_abort
Send a message to standard error and exit the shell.

gmt_get_nrecords
Returns the total number of lines in file(s)

gmt_get_ndatarecords
Returns the total number of data records in file(s), i.e., not counting headers.

gmt_get_nfields
Returns the number of fields or words in string

gmt_get_field
Returns the given field in a string. Must pass string between double quotes to
preserve it as one item.

gmt_get_region
Returns the region in the form w/e/s/n based on the data in table file(s).
Optionally add -I*dx*/dy to round off the answer.

gmt_get_gridregion
Returns the region in the form w/e/s/n based on the header of a grid file.
Optionally add -I*dx*/dy to round off the answer.

gmt_get_map_width
Expects the user to give the desired -R -J settings and returns the map width in
the current measurement unit.

gmt_get_map_height
Expects the user to give the desired -R -J settings and returns the map height in
the current measurement unit.

gmt_set_psfile
Create the output PostScript file name based on the base name of a given file
(usually the script name $0).

gmt_set_framename
Returns a lexically ordered filename stem (i.e., no extension) given the file
prefix and the current frame number, using a width of 6 for the integer including
leading zeros. Useful when creating animations and lexically sorted filenames are
required.

gmt_set_framenext
Accepts the current frame integer counter and returns the next integer counter.

NOTES


1. These functions only work in the Bourne shell (sh) and their derivatives (like ash,
bash, ksh and zsh). These functions do not work in the C shell (csh) or their derivatives
(like tcsh), and cannot be used in DOS batch scripts either.

2. gmt_shell_functions.sh were first introduced in GMT version 4.2.2 and have since been
regularly expanded with other practical scripting short-cuts. If you want to suggest other
functions, please do so by adding a New Issue request on gmt.soest.hawaii.edu.

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