A.chmod 2755 /bin/foo

B.chmod u-s /bin/foo

C.chmod 1755 /bin/foo

D.chmod 755+s /bin/foo

A.apt

B.apt-cache

C.dpkg

D.apt-get

E.apt-search

A.Match the preceding character set ([aei]) zero or more times.

B.Match the preceding character set ([aei]) one or more times.

C.Match a literal + symbol.

D.Match the preceding character set ([aei]) zero or one times.

A.column -s : 1,7 /etc/passwd

B.cut -d: -f1,7 /etc/passwd

C.chop -c 1,7 /etc/passwd

D.sort -t: -k1,7 /etc/passwd

E.colrm 1,7 /etc/passwd