What is the 'PS2' environment variable used for in Linux?*1 pointa) Secondary shell promptb) User passwordc) Terminal background colord) Display file content

In Linux, what does the PS1 environment variable control?*1 pointa) System passwordb) Shell promptc) Disk spaced) User profile

What is the purpose of environment variables in Linux?*1 pointa) Store user passwordsb) Store system configuration settingsc) Execute shell commandsd) Display file content

Bourne Again Shell (bash), similarly to other UNIX shells utilises environmental variable PS1'' to store prompt string description. Willing to change it, it is enough to replace its value with a new one. The most permanently looking effect can be obtained by performing adequate substitution in start script, which in case of bash is in ~/.bash_profile'' file (~'' stands for the home directory of a user in question).Prompt string can contain sequences like \x'', where x - a character, which during printing of prompt will be interpreted and substituted with specific information, e.g. \t'' - actual time. Description of other standard sequences can be found in man page concerning bash (man bash).Task: Permanently set URL-like prompt of the form:

Which character is used to represent the username in the PS1 prompt string?*1 pointa) %ub) %nc) %hd) %p

Which command is used to display the value of an environment variable in the terminal?*1 pointa) setb) envc) echod) show