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The command you're looking for is grep, and the regular expression you want is ^b.*[ig].*o$.

grep is used like

grep 'EXPRESSION' INPUT-FILES

and will output the lines matching EXPRESSION to its standard output (the terminal, in this case).

• The ^ anchors the expression to the start of the line, and the $ does the same but to the end.

• . matches any single character and * matches any number of the previous expression, so .* matches any number (including zero) of any character.

• [ig] will match a single i or g.

• All other characters (b and o) in this particular regular expression matches themselves.