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Learning/Knowledge checks/Scripting for EDA Automation/C shell for EDA environments/Check

Module checkpoint

C shell for EDA environments knowledge check

Answer every question from your current understanding. After submission, compare your reasoning with the explanation and revisit any weak concept.

This check covers C shell for EDA environments. Read it first if you have not.

5 QuestionsOne Answer eachImmediate ScoreDetailed Explanations

Read→Reason→Select→Review

Question 1 of 5A simulator started from tcsh cannot see `LM_LICENSE_FILE`, which the setup script created with `set LM_LICENSE_FILE = 27000@lic1`. Why?

set creates a shell variable; only setenv exports it to child processesset requires the value to be quoted before it is exportedTools read licence variables only from ~/.cshrc

Question 2 of 5Why is a site setup file run with `source setup.csh` rather than `csh setup.csh`?

csh refuses to run files that do not have execute permissionsource checks the file for syntax errors before running itsource runs it in the current shell, so its setenv and path changes remain afterwards

Question 3 of 5What does `$?PROJ_ROOT` evaluate to in csh?

The value of PROJ_ROOT, or an empty string1 if PROJ_ROOT is set and 0 if it is notThe exit status of the last command that used PROJ_ROOT

Question 4 of 5What does `-f` in `#!/bin/csh -f` do?

Skips reading the user's ~/.cshrc, so personal settings cannot change the scriptForces the script to stop at the first failing commandMakes every variable an environment variable

Question 5 of 5Why can a Bash script not simply `source setup_eda.csh`?

Bash only sources files whose names end in .shcsh files must be compiled before another shell can read themBash cannot parse csh syntax such as setenv, set path = (...) and endif

Review every selection before submitting. You can retry after reading the explanations.

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