Last login: Wed Jun 1 23:03:39 on ttys000
'c. Logged in as: bill.smith
,xNMM. ---------------------------------
.0MMMMo Operating System: macOS 12.4
0MMM0, Computer Name: MooseBook Pro II
.;loddo:' loolloddol;. Model Name: MacBook Pro
cKMMMMMMMMMMNWMMMMMMMMMM0: Model Identifier: MacBookPro18,3
.KMMMMMMMMMMMMMMMMMMMMMMMMWd. Serial Number (system): JP24RE9XNRY
;XMMMMMMMMMMMMMMMMMMMMMMMX. Memory: 16 GB
;MMMMMMMMMMMMMMMMMMMMMMMM:
:MMMMMMMMMMMMMMMMMMMMMMMM: FileVault is On.
.MMMMMMMMMMMMMMMMMMMMMMMMX. Activation Lock Status: Disabled
kMMMMMMMMMMMMMMMMMMMMMMMMWd. Uptime: 1 day, 21:47
.XMMMMMMMMMMMMMMMMMMMMMMMMMMk Battery Cycle Count: 35
.XMMMMMMMMMMMMMMMMMMMMMMMMK. Shell: /bin/zsh
kMMMMMMMMMMMMMMMMMMMMMMd.
;KMMMMMMMWXXWMMMMMMMMk. Today is Thursday, June 02, 2022
.cooc,. .,coo:. On this day: First issue of Computerworld, 1967
Create a .zlogin file in your home folder and paste the contents into the new file. https://gist.github.com/talkingmoose/15f055885b51cc8cb0bc7aad021acead
https://github.com/agnoster/agnoster-zsh-theme
https://github.com/powerline/fonts
https://dev.to/hannahgooding/how-i-customise-my-terminal-with-oh-my-zsh-macos-427i
https://misc.flogisoft.com/bash/tip_colors_and_formatting
https://github.com/lysyi3m/macos-terminal-themes#vs-code-dark-plus-download
Silence the “Last login” message
/usr/bin/touch .hushlogin
Restore the “Last login” message
/bin/rm .hushlogin
View formatted calendars in Terminal
/usr/bin/cal
June 2022
Su Mo Tu We Th Fr Sa
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30
View a different month
cal sep 2022
View a month in a different year
cal apr 2030
View the full calendar for a different year
cal 2030
Invoke ncal mode
cal -N
View formatted calendar in Terminal (vertical)
/usr/bin/ncal
June 2022
Mo 6 13 20 27
Tu 7 14 21 28
We 1 8 15 22 29
Th 2 9 16 23 30
Fr 3 10 17 24
Sa 4 11 18 25
Su 5 12 19 26
Get all the Fridays of a month
ncal | grep -E 'Fr'
Get all the Fridays of a year
ncal 2022 | grep -E 'Fr'
Include year and months
ncal 2022 | grep -E '^[[:blank:]]|Fr'
Display week numbers
ncal -w or
cal -Nw
Display week numbers for entire year
ncal -w 2022 or cal -Nw 2022
Get all the Fridays of a month
ncal -w | grep -E 'Fr'
Get all the Fridays of a year
ncal -w 2022 | grep -E 'Fr'
Include year and months
ncal -w 2022 | grep -E '^[[:blank:]]|Fr'
Earliest version of “calendar” command
https://www.freebsd.org/cgi/man.cgi?query=calendar&apropos=0&sektion=1&
manpath=Unix+Seventh+Edition&arch=default&format=html
New commands added to Unix Seventh Edition include Bourne shell, awk and calendar https://en.wikipedia.org/wiki/Version_7_Unix
Lord of the Rings first appears in 4.4BSD in .history
https://news.ycombinator.com/item?id=4847821
Lord of the Rings first appears February 15, 2003
https://svnweb.freebsd.org/base?view=revision&revision=110933
Bug 57623 - One LOTR calendar event still in calendar.history
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=57623#c0
View calendar.lotr
https://opensource.apple.com/source/misc_cmds/misc_cmds-23/calendar/calendars/calendar.lotr.auto.html
Note: Calendar relies on the cpp library. Your first run may ask you to install cpp as part of the Xcode command line utilities.
View the Lord of the Rings calendar
/bin/cat /usr/share/calendar/calendar.lotr
List more calendars
ls /usr/share/calendar/
Read a specific calendar for events today and tomorrow
/usr/bin/calendar -f /usr/share/calendar/calendar.music
Jun 3 Georges Bizet dies in Bougival, Paris, France, 1875
File ‘calendar’ in your home directory
/*
* Bill's calendar
*/
*/03 Pay mortgage
Friday Family game night
05/MonLast Memorial Day
/* Birthdays and Anniversaries */
01/16 Kirsten's birthday, 1969
02/14 Anniversary, 2000
05/27 Dean's birthday, 1966
06/03 Lori's birthday, 1958
/* Backups */
Monday Incremental backups, set 1
Tuesday Incremental backups, set 2
Wednesday Incremental backups, set 3
Thursday Incremental backups, set 4
Friday+1 Full backups
Friday+2 Incremental backups, set 5
Friday+3 Incremental backups, set 5
Friday+4 Incremental backups, set 5
Friday+5 Incremental backups, set 5
/* Other calendars */
#include <calendar.music>
#include <calendar.lotr>%
06/02 + tab + description
Asterisk ( * ) can mean any month
Friday means every Friday of the year
MonLast means last Monday of the month
Friday+3 means third Friday of the month
Include other calendars from /usr/share/calendars
#include <calendar.lotr>
Time a command
time + any command (including sudo)
There are two “times”
- shell built-in
- /usr/bin/time
View the time man page
man time
Print times on separate lines
/usr/bin/time -p + any command
To get just the time
(/usr/bin/time -p sudo jamf recon) 2>&1 | /usr/bin/awk '/real/{print $2}'
Password:
37.39
How long has your computer been running?
/usr/bin/uptime
Depending on the number of days, minutes and seconds your Mac has been running, uptime may return one of five formats
17:00 up 5 days, 51 mins, 2 users…
17.10 up 5 days, 1:01, 2 users…
17:00 up 51 secs, 2 users…
17:00 up 2 mins, 2 users…
17:00 up 1:01, 2 users…
Parse for a computer’s up time
/usr/bin/uptime | /usr/bin/awk -F 'up |, [0-9]+ users' '{ print $2 }'
1 day, 21:34
String formatter for time
View the man page for list of conversion characters
man strftime
View current date and time in this format: 2022-06-02 09:55:01
strftime '%Y-%m-%d %H:%M:%S'
View specific date and time in this format: 2014-10-31 07:40:18
strftime '%Y-%m-%d %H:%M:%S' 1414759218
View epoch date and time in this format: 1969-12-31 18:00:00
strftime '%Y-%m-%d %H:%M:%S' 0
View epoch date and tiime (adjust for Central time -06:00) in this format: 1970-01-01 00:00:0
strftime '%Y-%m-%d %H:%M:%S' 21600
Target date: 2022-06-02 13:27:01
Full day of the week
%A — Thursday
Abbreviated day of the week
%a — Thu
Full month
%B — June
Abbreviated month
%b — Jun
Minutes not month
%M — 27
Numerical month
%m — 06
Hour as two-digit 24-hour
%H — 13
Hour as two-digit 12-hour
%I — 01
Hour as padded 12-hour
%l — _1
Hour as unpadded 12-hour
%-l — 1
Print default view of date and time for right now
/bin/date
Set the clock to a specific date and time
07 = month
01 = day
00 = hour
00 = minute
22 = year
date 0701000022
Set the clock to a specific time (e.g. 5 o'clock p.m.)
17 = hour
00 = minute
date 1700
Resync with time server by turning time sync off and on
sudo /usr/sbin/systemsetup -setusingnetworktime off; sudo /usr/sbin/systemsetup -setusingnetworktime on
Print epoch time for right now
date +'%s' same as strftime %s
Subtract one epoch time from another to display elapsed time
echo $((1654194332-1654194325))
7
Script snippet for a timer
#!/bin/zsh
# start the timer
startTime=$( /bin/date '+%s' )
# do a whole lotta stuff here
# that takes a little while
sleep 5
# stop the timer
stopTime=$( /bin/date '+%s' )
# calculate elapsed time
timeDiff=$((stopTime-startTime))
# report running time
echo "The script took $timeDiff seconds to run."
exit 0
Convert one date format to another
Original format date: 2022-06-02
Reformatted date: Thursday, June, 2, 2022
date -j -f '%Y-%m-%d' 2022-06-02 +'%A, %B, %-d, %Y'
Adjust date and time properties when a specific day or date is unknown
Each adjustment begins with -v
Set a specific property to a specific value
-vMonday = Set the weekday of a date string to Monday
-v2023y = Set the year of a date string to 2023
-v3m = Set the month of a date strig to March
-v13h = Set the hour of a date string to 13 or 1 p.m.
-v26d = Set the date of a date string to 26
Adjust backward a specific property
-v-Monday = Adjust the weekday to the previous Monday
-v-2y = Adjust the year of a date string to two years ago
-v-3m = Adjust the month of a date strig to three months ago
-v-1h = Adjust the hour of a date string to one hour ago
-v-7d = Adjust the date of a date string to seven days ago
Adjust forward a specific property
-v+Monday = Adjust the weekday to the next Monday
-v+2y = Adjust the year of a date string to two years from now
-v+3m = Adjust the month of a date strig to three months from now
-v+1h = Adjust the hour of a date string to one hour from now
-v+7d = Adjust the date of a date string to seven days from now
Determine whether 2023 is a Leap Year (i.e., includes February 29)
Starting from June 2, 2022
date -v+1y -v3m -v1d -v-1d or
date -v2023y -v3m -v1d -v-1d
Tue Feb 28 10:42:29 CST 2023 is not a Leap Year
Starting from June 2, 2022
date -v+2y -v3m -v1d -v-1d or
date -v2024y -v3m -v1d -v-1d
Thu Feb 29 10:43:00 CST 2024 is a Leap Year