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

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

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

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

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:

7.____ command is used by the superuser for changing root’s password.*1 pointa) pdb) passwordc) pswdd) pwd