Appendix E. Linux Command Quick Reference
The following list describes some of the most useful and popular Linux commands. Consult the man page for each command to learn about additional arguments and details of operation.
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adduseruserid Creates a new userid, prompting for necessary information (requires
rootprivileges).-
aproposkeyword Searches the manual pages for occurrences of the specified keyword and prints short descriptions from the beginning of matching manual pages.
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attime,at -ffile time Executes commands entered via
stdin(or, by using the alternative form, the specified file) at the specified time. The time can be specified in a variety of ways; for example, in hour and minute formathh:mmor in hour, minute, month, day, and year formathh:mm mm/dd/yy.-
atq Prints descriptions of jobs pending via the at command.
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atrmjob Cancels execution of a job scheduled via the at command. Use the atq command to discover the identities of scheduled jobs.
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bg,bgjobs Places the current job (or, by using the alternative form, the specified jobs) in the background, suspending its execution so that a new user prompt appears immediately. Use the jobs command to discover the identities of background jobs.
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calmonth year Prints a calendar for the specified month of the specified year.
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catfiles Prints the contents of the specified files.
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cd,cddirectory Changes the current working directory to the user’s home directory or the specified directory.
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chgrp,group files