LPI 010-160 - Linux Essentials Certificate Exam - version 1.6

The correct command to create an archive file work.tar from the contents of the directory ./work/ is tar –cf work.tar ./work/. This command uses the -c option to create a new archive, the -f option to specify the file name, and the ./work/ argument to indicate the source directory. The other commands are incorrect for various reasons:

A. tar --new work.tar ./work/ is incorrect because there is no --new option in the tar command. The correct option for creating a new archive is --create or -c.

C. tar –create work.tgz –content ./work/ is incorrect because the -content option is not valid. The correct option for specifying the source files or directories is --files-from or -T. Also, the work.tgz file name implies compression, but the command does not use any compression option such as -z, -j, or -J.

D. tar work.tar < ./work/ is incorrect because the tar command does not accept input redirection from the standard input. The correct way to use the tar command is to provide the options and arguments after the command name.

E. tar work > work.tar is incorrect because the tar command does not produce output redirection to the standard output. The correct way to use the tar command is to use the -f option to specify the output file name. References: : tar command in Linux with examples - GeeksforGeeks : tar Command in Linux With Examples | phoenixNAP KB

 The correct command to extract the contents of the compressed archive file1.tar.gz is tar -xzf file1.tar.gz. This command uses the following options:

-x means extract files from an archive.

-z means filter the archive through gzip, which is a compression program that reduces the size of files.

-f means use the following archive file name, which is file1.tar.gz in this case.

The other commands are incorrect for the following reasons:

tar -czf file1.tar.gz creates a compressed archive file1.tar.gz from the files specified after the command, not extract it.

ztar file1.tar.gz is not a valid command, as ztar is not a standard program or option for tar.

tar --extract file1.tar.gz is missing the -z option to handle the gzip compression, and also the -f option to specify the file name.

detar file1.tar.gz is not a valid command, as detar is not a standard program or option for tar.

References:

Linux Essentials - Topic 106: The Linux Operating System, section 106.2 Use single shell commands and one line command sequences to perform basic tasks on the command line.

LPI Linux Essentials Study Guide: Exam 010 v1.6, 3rd Edition, Chapter 5: Working with Files and Directories, section Compressing and Archiving Files.

The correct permissions for the /tmp directory are rwxrwxrwt, which means that the owner, group, and others have read, write, and execute permissions, and that the sticky bit is set. The sticky bit is a special permission that prevents users from deleting or renaming files that they do not own in a shared directory. The /tmp directory is used for storing temporary files that may be created by different users and processes, so it needs to be accessible and writable by all, but also protected from unauthorized deletion or modification of files. The rwxrwxrwt permissions can be set by using the chmod command with either the octal mode 1777 or the symbolic mode a+trwx. References: : [File system permissions] : [Sticky bit] : [chmod]

The correct command to search for the file foo.txt under the directory /home is find /home –name foo.txt. This command uses the find command, which is used to search for files and directories that match certain criteria. The first argument, /home, specifies the starting point of the search. The second argument, -name, indicates that the search is based on the name of the file or directory. The third argument, foo.txt, is the name of the file to be searched for. The find command will recursively search all the subdirectories under /home and print the path of any file or directory that matches the name foo.txt.

The other commands are incorrect for various reasons:

A. search /home –file foo.txt is incorrect because there is no such command as search in Linux. The correct command for searching files and directories is find.

B. search /home foo.txt is incorrect because, as mentioned above, there is no search command in Linux. Also, this command does not use any option to specify the search criteria, such as -name, -type, -size, etc.

C. find /home – file foo.txt is incorrect because the option -file is not valid. The correct option for specifying the type of file or directory is -type, followed by a letter that indicates the type, such as f for regular file, d for directory, l for symbolic link, etc. For example, find /home -type f -name foo.txt would search for a regular file named foo.txt under /home.

E. find /home foo.txt is incorrect because this command does not use any option to specify the search criteria, such as -name, -type, -size, etc. This command will search for any file or directory that has foo.txt as part of its name, not exactly as its name. For example, this command will also match a file named barfoo.txt or a directory named foo.txt.bak.

References: : find command in Linux with examples - GeeksforGeeks : 15 Super Useful Examples of Find Command in Linux