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ps [Command]

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
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kill [Command]

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
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free [Command]

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:
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du [Command]

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
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df [Command]

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
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cal [Command]

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,
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wc [Command]

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
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unalias [Command]

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.
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touch [Command]

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
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tar [Command]

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
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