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50 Cards in this Set
- Front
- Back
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To print output to the screen what command is used?
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Echo
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Which command makes commands immune to hangups and quits?
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nohup
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UNIX/LINUX systems come with which two types of user accounts?
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Regular and Superuser
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Which command executes commands at a later time?
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at, batch
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Which command converts a file while copying it?
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dd
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Which command allows you to become another user without logging off?
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su (switch user)
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Which commands displays the present working directory?
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pwd
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Which command reads one line at a time?
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line
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Which command runs a command at low priority?
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nice
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What command is used to change the working directory?
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cd
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What command removes a directory?
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rmdir
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What allows processes to communicate with each other?
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A pipe ( | )
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What command with its many options displays a list of the processes currently running in a number of formats?
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PS
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Which command creates a directory?
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mkdir
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What is a special program used as an interface between the user and the heart of the UNIX/Linux operating system, a program called the kernel?
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The shell
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Which command compares two files for differences?
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diff
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What is descriptive material preceded by a # sign? They are not executable statements.
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Comments
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What command changes the owner and group on files and directories?
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chown
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The superuser account in UNIX/Linux is more commonly known as what?
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Root
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Which command compares two files?
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cmp
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What are the three prominent and supported shells on most UNIX systems?
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Bourne Shell (AT&T Shell), the C Shell (Berkeley Shell), and the Korn (superset of the Bourne Shell).
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Which command displays information about local and remote users?
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Finger
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Which command displays top CPU processes?
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top
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What is the first process the kernel creates which is the parent of all processes, with a PID of 1?
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init
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Which command browses or pages through a text file?
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more
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What command displays all processes as a tree with its roost being the first process that runs?
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pstree
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Which command displays who is logged on the system?
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who
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Which command sends output to a printer?
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lp
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What is a request for kernel services and is the only way a process can access the system’s hardware?
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System call
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Which command lists contents of a directory?
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ls
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Which command displays files one page at a time?
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pg
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What command changes permissions on files and directories?
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chmod
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Which command stores and retrieves files from an archive file, normally a tape device?
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tar
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Which command copies filename to another target, which is either a file or directory?
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cp
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What is a process that runs in the background and performs one or more tasks on a user’s behalf?
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Daemon
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Which command changes the login password and password attributes?
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passwd
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Which command compresses or expands files?
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gzip, gunzip, cat
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How is a process created in UNIX?
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with the fork system call
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What is a program in execution and can be identified by its unique PID number?
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Process
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What is a list of words separated by whitespace?
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An array
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Which command moves or renames files?
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mv
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Which command encrypts and decrypts the contents of a file?
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crypt
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The shell can define what two types of variables?
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Local and Environment
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Which command prints group membership of user?
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groups
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A process can be terminated by using keystroke-generated signals like Ctrl-C or Ctrl-\, or by using what?
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kill command
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A new program can terminate at any time by executing what?
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exit call
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A total number of how many bits constitute the permissions on a program?
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nine
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What is ultimately responsible for making sure that any commands typed at the prompt get executed properly?
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The shell
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There are some characters that are evaluated by the shell in a special way. They are known as?
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wildcards
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Which command removes files from directories?
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rm
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