RHCSA 2. Using essential tools- Questions and
Answers 100% Solved
Bash allows for the creation of a different environment in the login shell and in the subshell but
to synchronize settings; by default the subshell settings are included when entering a login shell.
Correct Ans-Describe the differencies between login shells and subshells
Messages in '/etc/motd' display after a user has successfully logged in to a shell.
(Notice that users in a graphical environment do not see its contents after a graphical
login.) Using '/etc/motd' can be a convenient way for system administrators to inform users.
Correct Ans-How to display a login message to users who successfully logged in into a shell ?
Another way to send information to users is by using /etc/issue.
The contents of this file display before the user logs in. This provides an excellent means of
specifying specific login instructions to users who are not logged in yet. Correct Ans-How to
display a login message to users before they login into a shell ?
To find information in man pages, you can search the mandb database by using
'apropos' or 'man -k' . (they are equivalent)
If the database is current, getting access to the information
you need is easy. Just type 'man -k' , followed by the keyword you want to search for.
,This command looks in the summary of all man pages that are stored in the mandb database.
Correct Ans-How to find the correct man page ?
If the man database isn't up to date update it by executing the 'mandb' command as root
without any arguments.
It will see whether new man pages have been installed and update the man database
accordingly. Correct Ans-How to update the man database ?
Apart from the information that you'll find in man, another system provides help about
command usage. This is the info system.
Most commands are documented in man, but some commands are documented only in the info
system. If that is the case, the "see also" section of the man page of that command will tell you
that "The full documentation for ... is maintained as a Texinfo manual."
If that happens, you can read the Info page using the command 'pinfo' or 'info' . Both
commands work, but
in pinfo , special items such as menu items are clearly indicated, which is why using pinfo is
recommended.
Info pages are organized like web pages, which means that they are organized in a hierarchical
way. To browse
, through that hierarchy, type 'n' to go to the next page, 'p' to go to the previous page, or 'u' to
move up in the hierarchy. Correct Ans-Describe the info command
B. Explanation: Answer B shows the correct syntax. The 2 redirects error messages, and &1
makes sure that the same is done for STDOUT. Correct Ans-Which of the following enables
you to redirect standard output as well as
errors to a file?
a. 1&2> file
b. 2>&1 file
c. >1&2 file
d. 1>2& file
A and B. Explanation: /etc/profile is the file that is processed for all users who are starting a
login shell Correct Ans-You are looking for a variable that is set in a bash login shell for all
users.
Which of the following files is the most likely location where this variable is
set? (Choose two.)
a. /etc/profile
Answers 100% Solved
Bash allows for the creation of a different environment in the login shell and in the subshell but
to synchronize settings; by default the subshell settings are included when entering a login shell.
Correct Ans-Describe the differencies between login shells and subshells
Messages in '/etc/motd' display after a user has successfully logged in to a shell.
(Notice that users in a graphical environment do not see its contents after a graphical
login.) Using '/etc/motd' can be a convenient way for system administrators to inform users.
Correct Ans-How to display a login message to users who successfully logged in into a shell ?
Another way to send information to users is by using /etc/issue.
The contents of this file display before the user logs in. This provides an excellent means of
specifying specific login instructions to users who are not logged in yet. Correct Ans-How to
display a login message to users before they login into a shell ?
To find information in man pages, you can search the mandb database by using
'apropos' or 'man -k' . (they are equivalent)
If the database is current, getting access to the information
you need is easy. Just type 'man -k' , followed by the keyword you want to search for.
,This command looks in the summary of all man pages that are stored in the mandb database.
Correct Ans-How to find the correct man page ?
If the man database isn't up to date update it by executing the 'mandb' command as root
without any arguments.
It will see whether new man pages have been installed and update the man database
accordingly. Correct Ans-How to update the man database ?
Apart from the information that you'll find in man, another system provides help about
command usage. This is the info system.
Most commands are documented in man, but some commands are documented only in the info
system. If that is the case, the "see also" section of the man page of that command will tell you
that "The full documentation for ... is maintained as a Texinfo manual."
If that happens, you can read the Info page using the command 'pinfo' or 'info' . Both
commands work, but
in pinfo , special items such as menu items are clearly indicated, which is why using pinfo is
recommended.
Info pages are organized like web pages, which means that they are organized in a hierarchical
way. To browse
, through that hierarchy, type 'n' to go to the next page, 'p' to go to the previous page, or 'u' to
move up in the hierarchy. Correct Ans-Describe the info command
B. Explanation: Answer B shows the correct syntax. The 2 redirects error messages, and &1
makes sure that the same is done for STDOUT. Correct Ans-Which of the following enables
you to redirect standard output as well as
errors to a file?
a. 1&2> file
b. 2>&1 file
c. >1&2 file
d. 1>2& file
A and B. Explanation: /etc/profile is the file that is processed for all users who are starting a
login shell Correct Ans-You are looking for a variable that is set in a bash login shell for all
users.
Which of the following files is the most likely location where this variable is
set? (Choose two.)
a. /etc/profile
