To copy all files having the string "chap" and any two characters after that to the "progs" directory, the correct command is:
A. cp chap?? progs
Explanation:
Option A) cp chap?? progs - This option is correct because the command "cp chap??" will copy all files that have the string "chap" followed by any two characters. The copied files will be placed in the "progs" directory.
Option B) cp chap* progs - This option is incorrect because the "*" wildcard symbol matches any number of characters, not just two characters. Therefore, it will copy all files that have the string "chap" followed by any number of characters, not specifically two characters.
Option C) cp chap[12] /progs/. - This option is incorrect because the "[12]" wildcard specifies that either the character "1" or "2" should be present at that position. It does not specify any two characters. Additionally, the "/progs/." path is not needed as the "progs" directory is already specified in the command.
Option D) cp chap?? /progs/* - This option is incorrect because the "/progs/*" path is not needed as the "progs" directory is already specified in the command. Additionally, the "?" wildcard matches any single character, not specifically two characters.
The correct answer is A) cp chap?? progs. This option is correct because it uses the correct wildcard symbol "?" to specify any two characters after the string "chap" and copies the files to the "progs" directory.