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14. Substitution

Command-line substitution is specified by a system command enclosed in backquotes. This command is spawned and the output it produces replaces the name of the command (and backquotes) on the command line. Some implementations also support pipes; see plot data-file special-filenames.

Newlines in the output produced by the spawned command are replaced with blanks.

Command-line substitution can be used anywhere on the gnuplot command line.

Example:

This will run the program leastsq and replace leastsq (including backquotes) on the command line with its output:
 
     f(x) = leastsq

or, in VMS
 
     f(x) = run leastsq

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