Linux/Unix Configuration

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

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

Command free free command displays the number of free and used memory in the system. Syntax free [options] Options -b: displays the amount of memory in bytes. -k:

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

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

Command cal cal Displays a calendar for any month of any year. Syntax cal [-jy] [[Month_Number] year] Options cal displays a simple calendar. If arguments are not specified,

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

Command unalias Eliminates the abbreviation as defined previously by using the alias. Syntax unalias abbreviation Description command unalias removes the abbreviation as defined previously by using the alias.

Command touch Changes the timestamp of file. Syntax touch [options] files Options -c prescribes not to touch the file if it does not exist. -d time, using the

Command tar 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