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NAME newfile - data file management
SYNOPSIS newfile
[file_name]
[current_scan_number]
DESCRIPTION The newfile macro is used
to initialize a new data file or reopen an old data file. You
might open a new data file for each new sample or each new
experiment. There is no specific limit to the number of scans
you can put in a data file, although for practical
considerations, you may want to start a new file after you have
accumulated one or two hundred scans or when the size of the data
file makes it unwieldy.
If file_name doesn't contain the
/ character, and if there is a directory named
data in the current directory, the file is opened in that
directory. If you give null as a file name,
/dev/null is used. Otherwise the file name or path name
given by file_name is used.
The next scan written to the file will have scan number
current_scan_number +1.
You can use newfile to reopen an existing data
file. New scans will be placed at then end of the file. You can
use command u grep #S file_name to find
the last scan number in an existing file.
GLOBALS
DATAFILE - Global variable holding name of
the current data file. Its value is written in the data file
header preceded by
#F.
SCAN_N - Global variable holding current
scan number. Its value is written in the data file scan headers
preceded by
#S.
EPOCH - Constant variable holding the time
at which the data file was opened. Its value is written in the
data file header preceded by
#E.
TITLE - Global variable written as a
comment in the data file header. Its value is an arbitrary
string set by the user.
EXAMPLE newfile Au110.12
SEE ALSO
startup
scans
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Last Formatted Jun 20, 2009
Last Updated 02/28/01
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