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Linux Common Options

Common Commands & Options

QuestionAnswer
at 10:15pm Schedules commands to run at 10:15pm on the current date.
at 10:15pm July 15 Schedules commands to run at at 10:15pm on July 15
at midnight Schedules commands to run at midnight on the current date.
at noon July 15 Schedules commands to run at noon on July 15.
at teatime Schedules commands to run at 4:00pm on the current date.
at tomorrow Schedules commands to run the next day.
at now + 5 minutes Schedules commands to run in 5 minutes.
at now + 10 hours Schedules commands to run in 10 hours.
at now + 4 days Schedules commands to run in 4 days.
at now + 2 weeks Schedules commands to run in 2 weeks.
at now at batch Schedules commands to run immediately.
at 9:00am 01/30/2011 at 9:00am 01032011 at 9:00am 03.01.2011 Schedules commands to run at 9am on January 3, 2011.
SIGHUP (1) Hang-up signal. Stops a process, then restarts it with the same PID.
SIGINT (2) Sends an interrupt signal to a process. One of the weakest kill signals but works most of the time. Ctrl+c is to kill a process is actually a SIGINT.
SIGQUIT (3) Known as a Core Dump, this quit signal terminates a process by taking the info in memory and saving it to a file called core on the hard disk in the current working directory. Use Ctrl+\ to send a SIGQUIT signal to a process currently running.
SIGTERM (15) This Software Termination signal is the most common kill signal used by programs to kill other processes. It is the default kill signal used by the kill command.
SIGKILL (9) Known as the absolute kill signal, this signal forces the Linux kernel to stop executing the process by sending the processes resources to a special device file called /dev/null
ls –a Lists all filenames.
ls --all Lists all filenames.
ls –A Lists most filenames (excludes the . and .. special files).
ls --almost-all Lists most filenames (excludes the . and .. special files).
ls –C Lists filenames in column format.
ls --color=n Lists filenames without color.
ls –d Lists directory names instead of their contents.
ls --directory Lists directory names instead of their contents.
ls –f Lists filenames without sorting.
ls –F Lists filenames classified by file type.
ls --classify Lists filenames classified by file type.
ls --full-time Lists filenames in long format and displays the full modification time.
ls –l Lists filenames in long format.
ls –lh Lists filenames in long format with human-readable (easy-to-read) file sizes.
ls –l --human-readable Lists filenames in long format with human-readable (easy-to-read) file sizes.
ls -lG List filenames in long format but omits the group information.
ls –l --no-group Lists filenames in long format but omits the group information.
ls –o Lists filenames in long format but omits the group information.
ls –r Lists filenames reverse sorted.
ls --recursive Lists filenames reverse sorted.
ls –s Lists filenames and their associated size in kilobytes (KB).
ls –S Lists filenames sorted by file size.
ls –t Lists filenames sorted by modification time.
ls –U Lists filenames without sorting.
ls –x Lists filenames in rows rather than in columns.
Created by: Sumbunny