Setting a cron



  • Crontab

    To display your cron file you run the following command:

    crontab -l
    

    The root user can see any users crontab file by adding “-u username”, for example:

    crontab -u rick -l 
    

    Each line is a collection of six fields separated by spaces.

    The fields are:

    • The number of minutes after the hour (0 to 59)
    • The hour in military time (24 hour) format (0 to 23)
    • The day of the month (1 to 31)
    • The month (1 to 12)
    • The day of the week(0 or 7 is Sun, or use name)
    • The command to run
    *     *     *     *     *  Command string
    -     -     -     -     -
    |     |     |     |     |
    |     |     |     |     +----- Day of week (0-7)
    |     |     |     +------- Month (1 - 12)
    |     |     +--------- Day of month (1 - 31)
    |     +----------- Hour (0 - 23)
    +------------- Min (0 - 59)
    

    The ‘asterisks’ are where you enter day, time ect, however they can be left as ''s , meaning null*


    To edit crontab file run:

    crontab -e
    

    To enable your preferred editor follow this quick and simple guide: force-crontab-editor-default-editor


    To list all crons in the file:

    crontab -l
    

    Example:

    Reboot the machine every hour:

    0   *   *   *   * /sbin/shutdown -r now
    

    Reboot the machine at ten minutes past midnight every day:

    10  0   *   *   * /sbin/shutdown -r now
    

    Reboot the machine every monday at 2 AM

    0   2   *   *   1  /sbin/shutdown -r now
    

    Reboot the machine using range:

    Reboot the machine within the range of hours matching 1, 2, 3 and 4AM

    *   1-4   *   *   * /sbin/shutdown -r now
    

 



Tmux Commands

screen and tmux

A comparison of the features (or more-so just a table of notes for accessing some of those features) for GNU screen and BSD-licensed tmux.

The formatting here is simple enough to understand (I would hope). ^ means ctrl+, so ^x is ctrl+x. M- means meta (generally left-alt or escape)+, so M-x is left-alt+x

It should be noted that this is no where near a full feature-set of either group. This - being a cheat-sheet - is just to point out the most very basic features to get you on the road.

Trust the developers and manpage writers more than me. This document is originally from 2009 when tmux was still new - since then both of these programs have had many updates and features added (not all of which have been dutifully noted here).

Action tmux screen
start a new session tmux OR
tmux new OR
tmux new-session
screen
re-attach a detached session tmux attach OR
tmux attach-session
screen-r
re-attach an attached session (detaching it from elsewhere) tmux attach -d OR
tmux attach-session -d
screen -dr
re-attach an attached session (keeping it attached elsewhere) tmux attach OR
tmux attach-session
screen -x
detach from currently attached session ^b d OR
^b :detach
^a ^d OR
^a :detach
rename-window to newname ^b , <newname> OR
^b :rename-window <newn>
^a A <newname>
list windows ^b w ^a w
list windows in chooseable menu ^a "
go to window # ^b # ^a #
go to last-active window ^b l ^a ^a
go to next window ^b n ^a n
go to previous window ^b p ^a p
see keybindings ^b ? ^a ?
list sessions ^b s OR
tmux ls OR
tmux list-sessions
screen -ls
toggle visual bell ^a ^g
create another window ^b c ^a c
exit current shell/window ^d ^d
split window/pane horizontally ^b " ^a S
split window/pane vertically ^b % ^a |
switch to other pane ^b o ^a <tab>
kill the current pane ^b x OR (logout/^D)
collapse the current pane/split (but leave processes running) ^a X
cycle location of panes ^b ^o
swap current pane with previous ^b {
swap current pane with next ^b }
show time ^b t
show numeric values of panes ^b q
toggle zoom-state of current pane (maximize/return current pane) ^b z
break the current pane out of its window (to form new window) ^b !
re-arrange current panels within same window (different layouts) ^b [space]
Kill the current window (and all panes within) ^b killw [target-window]
  • ?

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