Display amount of free and used memory in the system NAME free - Display amount of free and used memory in the system SYNOPSIS free [ options ] DESCRIPTION free displays the total …display file or file system status NAME stat - display file or file system status SYNOPSIS stat [ OPTION ]... FILE ... DESCRIPTION Display file or file system status. Mandatory arg…print effective user name NAME whoami - print effective user name SYNOPSIS whoami [ OPTION ]... DESCRIPTION Print the user name associated with the current effective user ID. Same …print user´s login name NAME logname - print user´s login name SYNOPSIS logname [ OPTION ] DESCRIPTION Print the user's login name. --help display this help and exit --version outp…profile memory usage of a program NAME memusage - profile memory usage of a program SYNOPSIS memusage [ option ]... program [ programoption ]... DESCRIPTION memusage is a bash scri…output a string repeatedly until killed NAME yes - output a string repeatedly until killed SYNOPSIS yes [ STRING ]... yes OPTION DESCRIPTION Repeatedly output a line with all speci…call the unlink function to remove the specified file NAME unlink - call the unlink function to remove the specified file SYNOPSIS unlink FILE unlink OPTION DESCRIPTION Call the un…perform topological sort NAME tsort - perform topological sort SYNOPSIS tsort [ OPTION ] [ FILE ] DESCRIPTION Write totally ordered list consistent with the partial ordering in FIL…print the numeric identifier for the current host NAME hostid - print the numeric identifier for the current host SYNOPSIS hostid [ OPTION ] DESCRIPTION Print the numeric identifie…print machine hardware name (same as uname -m) NAME arch - print machine hardware name (same as uname -m) SYNOPSIS arch [ OPTION ]... DESCRIPTION Print machine architecture. --help…print the file name of the terminal connected to standard input NAME tty - print the file name of the terminal connected to standard input SYNOPSIS tty [ OPTION ]... DESCRIPTION Pr…call the link function to create a link to a file NAME link - call the link function to create a link to a file SYNOPSIS link FILE1 FILE2 link OPTION DESCRIPTION Call the link func…print the groups a user is in NAME groups - print the groups a user is in SYNOPSIS groups [ OPTION ]... [ USERNAME ]... DESCRIPTION Print group memberships for each USERNAME or, if…factor numbers NAME factor - factor numbers SYNOPSIS factor [ OPTION ] [ NUMBER ]... DESCRIPTION Print the prime factors of each specified integer NUMBER. If none are specified on …print the user names of users currently logged in to the current host NAME users - print the user names of users currently logged in to the current host SYNOPSIS users [ OPTION ]..…do nothing, successfully NAME true - do nothing, successfully SYNOPSIS true [ ignored command line arguments ] true OPTION DESCRIPTION Exit with a status code indicating success. -…checksum and count the blocks in a file NAME sum - checksum and count the blocks in a file SYNOPSIS sum [ OPTION ]... [ FILE ]... DESCRIPTION Print or check BSD (16-bit) checksums.…delay for a specified amount of time NAME sleep - delay for a specified amount of time SYNOPSIS sleep NUMBER [ SUFFIX ]... sleep OPTION DESCRIPTION Pause for NUMBER seconds, where …remove empty directories NAME rmdir - remove empty directories SYNOPSIS rmdir [ OPTION ]... DIRECTORY ... DESCRIPTION Remove the DIRECTORY(ies), if they are empty. --ignore-fail-on…check whether file names are valid or portable NAME pathchk - check whether file names are valid or portable SYNOPSIS pathchk [ OPTION ]... NAME ... DESCRIPTION Diagnose invalid or…