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.
We prepared the shells as described above, then measured three shell variables: maximum shell length, maximum shell width, and maximum apertural lip thickness with calipers to the nearest 0.01 mm, prior to crushing.
Linear correlations were then removed from these shell variables by analysis of covariance, and the residual values were reanalyzed by ANOVA.