What does the at command do?

The at command mails you all output from standard output and standard error for the scheduled commands, unless you redirect that output. It also writes the job number and the scheduled time to standard error. When the at command is executed, it retains the current process environment.

What is the at command in Linux?

The at command is a Linux command-line utility used to schedule a job for later execution. The utility reads commands from standard input and groups them into an at job, which executes only once. The alternative for at is a cron job. However, while at jobs execute only once, cron jobs are recurring events.

How do you set a job at command?

How to Create an at Job

1. Start the at utility, specifying the time you want your job executed. $ at [-m] time [ date ] -m.
2. At the at prompt, type the commands or scripts that you want to execute, one per line.
3. Exit the at utility and save the at job by pressing Control-D.

How do I get a list of all commands in Linux?

Syntax

1. -c − used to list all the commands you could run.
2. -a − used to list all the aliases you could run.
3. -k − used to list all the keywords you could run.
4. -b − used to list all the built-ins you could run.
5. -A function − used to list all the functions you could run.

What does the at command do on Windows?

In addition to the graphical user interface for Windows Task Scheduler in Control Panel, Windows provides an at.exe command that schedules commands and programs to run on a computer at a specified time and date (similar to cron ).

How do I see all commands in Linux?

At the command line, type compgen -c | more to list every command you can run. Use the space bar each time you’d like to go down another long page of text. You’ll notice that this utility has an extremely broad idea of what a command is.

Which command is used to list the status of jobs?

The jobs command displays the status of jobs started in the current terminal window.

How do I get a list of all commands in Ubuntu?

Your options are:

1. By pressing the TAB key (“-><-“) twice, you’ll complete any command in the console and, if the line is empty, you’ll get the number and the names of all available commands.
2. Use man -k NAME to search for a command (or part of it) and man COMMAND to obtain the manual for that command.

How do I see pending jobs in Linux?

Procedure

1. Run bjobs -p. Displays information for pending jobs (PEND state) and their reasons. There can be more than one reason why the job is pending.
2. To get specific host names along with pending reasons, run bjobs -lp.
3. To view the pending reasons for all users, run bjobs -p -u all.

What is the difference between cron and at?

It’s pretty simple. At is used to schedule something one time. Cron is used to schedule something repeatedly – every day, hour, week, etc.

How do I see a list of scheduled tasks in Windows?

To open Scheduled Tasks, click Start, click All Programs, point to Accessories, point to System Tools, and then click Scheduled Tasks. Use the Search option to search for “Schedule” and choose “Schedule Task” to open the Task Scheduler. Select the “Task Scheduler Library” to see a list of your Scheduled Tasks.

What does * * mean in cmd?

In this case, we used the * wildcard to mean “all files in the current directory”. This command prints the line containing the given string, and if there’s more than one file in the list, the name of the file where it was found.

How do I get all command history in Linux?

Open a terminal application on your Linux or Unix and type history to list all commands. To search for a command in the history, press ctrl+r multiple times.

How do I list all jobs in Linux?

To list currently running processes, use the ps , top , htop , and atop Linux commands. You can also combine the ps command with the pgrep command to identify individual processes.

How do I list all jobs running in UNIX?

Check running process in Unix

1. Open the terminal window on Unix.
2. For remote Unix server use the ssh command for log in purpose.
3. Type the ps aux command to see all running process in Unix.
4. Alternatively, you can issue the top command to view running process in Unix.

What are the at and ATQ commands in Linux?

Linux at, batch, atq, and atrm commands. On Unix-like operating systems, the at, batch, atq, and atrm commands can schedule a command or commands to be executed at a specified time in the future. This document covers the GNU/Linux versions of at, batch, atq, and atrm.

What is ATQ job list?

atq lists the user’s pending jobs, unless the user is the superuser; in that case, everybody’s jobs are listed. The format of the output lines (one for each job) is: job number, date, hour, year, queue, and username.

How do I display the queue in ATQ?

Type atq to display the queue. This information is, from left to right: job number, date, hour, year, queue, and username. atq only list jobs that belong to you — unless you are the superuser, in which case it lists the jobs of all users.

What is the difference between at and ATQ?

Technical Description. at and batch read commands from standard input or a specified file that are to be executed at a later time, using sh. at executes commands at a specified time. atq lists the user’s pending jobs, unless the user is the superuser; in that case, everybody’s jobs are listed.