Linux and UNIX Systems Configuration Help, How To, Tutorial and Basic Information

1. tar

Command tar Creates archive files or extract files from archives. Syntax tar [options] file_or_directory Options -c creates a new archive. -d compares the files from the archive files from the ...

2. rmdir

... removes empty directories. If the directory is not empty, you must remove all files along with the directory using the command rm -r.  ...

3. rm

Command rm Removes one or more files. Syntax rm [options] files Options -f deletes files without asking. -i asks for confirmation before deleting files. -r recursively deletes files in all subdirectories ...

4. mv

Command mv Renames files and directories or move them from one directory to another. Syntax mv [options] source destination Options -b creates backup copies of files that are moved or renamed. ...

5. more

Command more Performs view text files. Syntax more [options] file_names Options +N (where N - number) displays the file, starting at the specified line number. +/pattern begins with a display ...

6. ls

Command ls Prints the contents of the directory. Syntax ls [options] [directory-names] Options -a displays all files, including those with names starting with a dot (.). -b displays unprintable ...

7. ln

Command ln Sets hard or symbolic links (aliases) for files and directories. Syntax ln [options] existing_file new_name Options -b backs up files before deleting them. -d creates a hard link to ...

8. How To Enable Root Login on Fedora

... like # auth required pam_succeed_if.so user != root quiet Save and exit the editor. Do the same with files in /etc/pam.d/ starting with "pam_" configuration file Save and close all ...

9. less

Command less less command displays text files (with the possibility of searching through back). Syntax less [options] file_name Options -? displays a list of commands that can use less. -p displays ...

10. info

Command info info command displays online help for any command Linux. Syntax info [options] command Options -d add the directory to the list of directories in which files are being explored.  ...

11. gzip

Command gzip gzip command compress one or more files. Syntax gzip [options] files Options -c displays the output file to standard output and keeps the original file. -d decompresses the file (same ...

12. gunzip

Command gunzip gunzip command uncompress zip-files. Syntax gunzip [options] files Options See options for gzip. Description Team gunzip decompresses the compressed files (with extension .gz ...

13. grep

Command grep grep command provides search in one or more files, lines that match the regular expression (search patterns). Syntax grep [options] pattern files Options -N (where N-number) displays ...

14. find

Command find find command displays a list of files that match a given set of criteria. Syntax find [path] [options] Options -depth first processing the current directory, then its subdirectories. ...

15. file

Command file file command displays the type of data file based on rules defined in the file /usr/lib/magic (known as the magicfile). Syntax file [options] files Options -c displays formatted in ...

16. du

Command du du command displays the amount of disk space occupied by files or directories. Syntax du [options] [directories_or_files] Options -a displays information about memory usage for all ...

17. dos2unix

... mode: ASCII (default), 7bit, ISO, Mac. Description Dos2unix command is used to convert the formats of text files DOS/Mac to UNIX format. It is known that the formats of text files in different operating ...

18. diff

Command diff diff command shows the differences between two text files (or all files with the same names in two different directories). Syntax diff [options] first_file a second_file Options -a ...

19. df

Command df df command displays the number of free and occupied space on all mounted filesystems systems. Syntax df [options] [filesystem] Options -a displays all file systems. -i displays information ...

20. cp

Command cp cp command copies files and directories. Syntax cp [options] source_file destination_file cp [options] source_file destination_directory Options -a preserves all the attributes of a ...