shell variable

shell variable

(programming, operating system)
One of the variables accessible to a Unix shell process, including environment variables (e.g. $HOME), command line arguments (e.g. $1) and local variables (e.g. $input_file). Other operating systems have similar variables.
References in periodicals archive ?
This association does not occur casually (Hazlett, 1981), because shell selection by hermit crabs is influenced by diverse shell variables such as weight, size, shape, internal volume, occurrence of exobionts and resistance to predation and desiccation (Hazlett, 1981; Abrams, 1988; Martinelli and Mantelatto, 1998; Mantelatto and Dominciano, 2002).
sawayai, in the Caraguatatuba region, northern littoral of Sao Paulo state coast, by systematized collection and analysis, using the percentage of shell occupation and demonstrating the shell variables that best fit the hermit crabs.
For each individual, we initially measured three shell variables (shell length, shell width, and body thickness) using vernier calipers (see Fig.
They reported that when all other shell variables are approximately equal, gastropods with larger shells, thickened apertural lips, or sculptured shells suffered significantly fewer fatal attacks from shell-crushing crabs than gastropods with small, thin or unornamented shells.
Linear correlations were then removed from these shell variables by analysis of covariance, and the residual values were reanalyzed by ANOVA.