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

1. tar

... read the archive from the specified file. -L n determines the size of the tape to n kilobytes. -N date archive only files newer than specified date. -T file archives or extract files with names listed ...

2. 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 ...

3. 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. ...

4. 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 ...

5. mkdir

Command mkdir Creates a directory. Syntax mkdir [options] directory_names Options -m access appoints new directory specified access rights. -p creates parent directories if they do not exist. ...

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. 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 ...

8. kill

... and names of signals. Description The kill command sends a signal to the process. The signal default kill signal is TERM Usually this signal is designed to complete the process. For example, kill -9 ...

9. gunzip

... or .Z). After uncompress gunzip replaces the compressed files to the unpacked versions and removes from names file extension .gz or .Z. Team gunzip is equivalent to gzip with option -d.  ...

10. groups

Command groups groups command shows the groups to which the user belongs. Syntax groups [username] Description groups command displays the names of groups to which the user belongs. Unless specify ...

11. grep

... names of files containing the sample. -n display line numbers next to the lines containing the sample. -q returns the status code, but nothing prints. -v print lines not containing the sample. -w compares ...

12. find

... -maxdepth n restricts the search to n levels of subdirectories. -follow processes the directories specified with symlinks. -name pattern of files with names matching a pattern. -ctime n compares the files ...

13. 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 ...

14. chown

... type chown with user name, and then - the names of files. To change the group owner, add the user name after the point of a new group name.  ...

15. chgrp

... group name, and after him - the names of files (group owner can also change and by command chown).  ...

16. Linux, UNIX User Management Commands

...    usermod Modify a user account.     users Print the user names of users currently logged in.     utmpdump Used for debugging.   ...

17. Default Port Numbers

...  telnet 23/tcp # 24 - private smtp 25/tcp mail # 26 - unassigned time 37/tcp timserver time 37/udp timserver rlp 39/udp resource # resource location nameserver 42/tcp name # IEN 116 ...