!!command history expansion executes the previous command. Entering the Ctrl-P keystroke uses the Emacs key-binding bash to move up one line in the history; pressing Enter executes that command.
The man command displays manpages.
b AND c. find and locate do not search the contents of files. /etc/passwd is not a script.
a. The variable must be set and exported. The semicolon separates the two commands.
01;02;03;04;05;06;07;08;09;10. The -w option to seq instructs it to pad with zeros.
a. cp should be aliased to the interactive mode with the -i option in .bashrc. .bash_profile normally doesn’t include aliases.
e. The script has an error and will not produce the expected output. In a
forstatement, the loop variable does not have the dollar sign. Changing line 2 to
in a1 a2will correct the error and produce the output in answer b.
d. The shadow password system has been implemented, placing all passwords in /etc/shadow as denoted by the
xfollowing the username.
d. Graphical login support for remote hosts on the network
d. xfce and e. X11.
c. An assistive technology that handles screen reading for a number of console applications
gindicates that we’re operating on the group privilege, and the
+sindicates that we should add the “set id” bit, which means that the SGID property will be applied.
e. With the top bit of the last byte set in the subnet mask (.128), there ...