101-500 Exam Dumps and Practice Questions

The former path of the data can be kept intact by creating a symbolic link from the old to the new path of the data or by mounting the new filesystem on the original path of the data. A symbolic link is a special file that points to another file or directory. It can be used to create a shortcut to the new location of the data without changing the applications that access it. Mounting the new filesystem on the original path of the data means that the data will appear as if it is still in the same location, but it is actually stored on a different device or partition. This can be done by editing the /etc/fstab file or using the mount command.Reference:

[LPI Linux Essentials - 1.3 Basic File Management]

[LPI Linux Essentials - 1.4 Finding Files]

[LPI Linux Essentials - 2.1 Using Devices, Linux Filesystems, Filesystem Hierarchy Standard]

[LPI Linux Essentials - 2.2 Mounting, Unmounting Filesystems]

[LPI Linux Essentials - 2.3 Disk Partitions]

The problem with the command

sed -e ''s/a/b/'' /tmp/file >/tmp/file

is that it tries to read and write from the same file, which results in overwriting the file before the command can process it. The shell sets up the redirection by opening the file/tmp/filefor writing and truncating it to zero length. Then it executes thesedcommand, which tries to read from the same file, but finds it empty. Therefore, the output is also empty and the file remains empty. A possible solution is to use a temporary file for the output and then rename it to the original file name. For example:

sed -e ''s/a/b/'' /tmp/file >/tmp/file.tmp && mv /tmp/file.tmp /tmp/file

This way, the original file is not overwritten until thesedcommand finishes successfully. The other options are either incorrect or not applicable. The file order is correct, thesedcommand does match something in the file, and the>character is valid for redirection. The|character is used for piping, not redirection.Reference:

LPIC-1 Exam 101 Objectives, Topic 103: GNU and Unix Commands, 103.4 Use streams, pipes and redirects

LPIC-1 Linux Administrator 101-500 Exam FAQ, LPIC-1 Exam 101 Objectives, GNU and Unix Commands (Total Weight: 25)

The i and a commands are two of the most commonly used commands in the vi editor to enter the insert mode. The insert mode allows the user to insert text into the file. The difference between the i and a commands is that the i command inserts text before the current cursor position, while the a command inserts text after the cursor position. For example, if the cursor is on the letter ''e'' in the word ''editor'', then pressing i will allow the user to insert text before the ''e'', while pressing a will allow the user to insert text after the ''e''. The user can exit the insert mode by pressing the Esc key, which will return to the command mode.Reference:

Basic vi commands (cheat sheet)

VI Editor with Commands in Linux/Unix Tutorial

How to use Vi editor in Linux (with examples)

The iconv command (note: the question appears to have a typo with 'iccnv') converts text from one character encoding to another. It reads input in one specified character encoding and outputs it in another specified encoding. This is useful for handling text files that use different character sets or for preparing files for systems that require specific encodings.

The output of the given command line isfoo bar. The command line consists of three commands that are connected by pipes (|). A pipe is a symbol that redirects the standard output of one command to the standard input of another command. Theechocommand prints its argument to the standard output, which isfoo barin this case. Theteecommand reads from the standard input and writes to both the standard output and a file. The file name is given as an argument, which isbarin this case. Thecatcommand reads from the standard input and writes to the standard output. Therefore, the command line does the following:

Theechocommand printsfoo barto the standard output, which is redirected to the standard input of theteecommand by the first pipe.

Theteecommand readsfoo barfrom the standard input and writes it to both the standard output and the filebar. The standard output of theteecommand is redirected to the standard input of thecatcommand by the second pipe.

Thecatcommand readsfoo barfrom the standard input and writes it to the standard output, which is displayed on the terminal.

Hence, the output of the command line isfoo bar. The other options are either incorrect or not applicable. Thecat,tee barandbarare not printed by any of the commands. Thefoois only part of the output, not the whole output.Reference:

LPIC-1 Exam 101 Objectives, Topic 103: GNU and Unix Commands, 103.4 Use streams, pipes and redirects

LPIC-1 Linux Administrator 101-500 Exam FAQ, LPIC-1 Exam 101 Objectives, GNU and Unix Commands (Total Weight: 25)