Linux Server and Workstation Configuration How To

1. whatis

Command whatis Searches for whole words in the database whatis (see command apropos). Syntax whatis keyword Options no Description whatis command displays the result of search whole words ...

2. wc

Command wc Displays the number of bytes, words and lines found in the file. Syntax wc [options] [files] Options -c displays only the number of bytes. -w only shows the number of words. -l ...

3. uptime

Command uptime Displays the time of continuous operation of the system. Syntax uptime Options no Description uptime utility displays the current time, time of continuous operation of the system, ...

4. uname

Command uname Displays system information, such as the type of machine and operating system. Syntax uname [options] Options -a displays all the information. -m displays the type of equipment ...

5. top

Command top Displays a list of currently executing processes, ordered by the percentage use of CPU time. Syntax top [q] [d interval] Options q requires top performance with the highest possible ...

6. tar

... current directory. -r adds the files in the archive. -t displays the contents of the archive. -x extracts files from the archive. -C directory extracts the files in the specified directory. -f file ...

7. tail

Command tail Displays the last few lines of the file. Syntax tail [options] file Options -N (where N - number) displays the last N lines. -n N (where N - number) displays the last N lines. -f ...

8. rm

... contained in the catalog. -v displays the names of the files before deleting them. Description The rm command removes the specified files. To delete a file, you must have the right to record the directory ...

9. pstree

Command pstree Displays all running processes in a tree. Syntax pstree [options] [process_id] Options -a displays the command line arguments. -c does not compress the subtrees. -l displays a long ...

10. ps

Command ps Displays the status of processes (programs) running in the system. Syntax ps [options] Options Note that unlike other commands ps command options do not have a prefix "-". a display ...

11. mv

... -f remove existing files without confirmation. -i asks for confirmation before overwriting existing files. -v displays the name of the file before moving. Description The mv command renames a file ...

12. 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 ...

13. man

... indicates listatel pager leadership (eg, less). -a displays all man-pages that match a specific command. -h displays help for the team only man. -w indicates the location of the displayed man-pages. Description ...

14. 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 ...

15. ln

... a directory (this can be done only by root). -f remove existing file named newname. -help displays help for the team. -s creates a symbolic link. -v generates detailed output information. Description ...

16. 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 ...

17. ldd

Command ldd ldd command displays the names of shared libraries required for execution. Syntax ldd [options] program Options -v displays the version number of ldd. -V displays the version number ...

18. kill

Command - kill Kill command sends a signal to the process. Syntax kill [options] id_process Options -Nsignal sends a specified signal (where Nsignal - the number or name). -l displays the number ...

19. 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.  ...

20. id

Command id Id command displays the user ID, group ID and user groups. Syntax id [options] [username] Options -g prints only the group ID. -n displays the name of the group, rather than group ...