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Date
The simple “date” command displays the current date and time (including the day of the week, month, time, time zone, year).
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date
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tim@tim-Nitro-N50-620:~$ date
Thu Mar 2 07:23:38 PM EST 2023
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Date TZ
By default, “date” command uses the time zone defined in path “/etc/localtime”. Linux user can change the time zone via Terminal by using command “TZ”.
Date --set
Linux allows its user to set the current date and time of the system manually.
Syntax: date –set=”Date_in_format(YYMMDD) Time_in_format(HH:MM)”
Date -d
To operate the system on a specific date, you can change the date by using “-d”.
Syntax: date -d Date_to_operate_system_on
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date
TZ=GMT date
TZ=America/New_York date
sudo date --set="20230519 22:10"
date -d now
date -d yesterday
date -d tomorrow
date -d last-Sunday
date -d "1997-04-22"
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tim@tim-Nitro-N50-620:~$ date
Thu Mar 2 07:23:38 PM EST 2023
$ TZ=GMT date
Fri Mar 3 12:03:59 AM GMT 2023
tim@tim-Nitro-N50-620:~$ TZ=America/New_York date
Thu Mar 2 07:04:12 PM EST 2023
$ date -d now
Thu Mar 2 07:36:55 PM EST 2023
$ date -d yesterday
Wed Mar 1 07:37:00 PM EST 2023
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DF
The command “df” shows the amount of disk space used and disk space available on every file system containing each filesystem’s name and its path.
Syntax: df
The command “df -h” shows the same result as the command “df” but now the data is in a more human-readable form that can be easily comprehended by a new user.
Syntax: df -h
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df
df -h
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$ df
Filesystem 1K-blocks Used Available Use% Mounted on
tmpfs 1623284 3612 1619672 1% /run
/dev/nvme0n1p3 491343600 18123184 452739188 4% /
tmpfs 8116400 104604 8011796 2% /dev/shm
tmpfs 5120 4 5116 1% /run/lock
tmpfs 8116400 0 8116400 0% /run/qemu
/dev/nvme0n1p2 456036 182424 239424 44% /boot
/dev/nvme0n1p1 98304 57271 41033 59% /boot/efi
/dev/sda1 47744748 57156 45229840 1% /tmp
/dev/sda3 2787016696 1123163768 1531975216 43% /home
/dev/sda2 47745772 31301948 13986020 70% /var
192.168.1.1:/media/TR-004 11627352064 9633692672 1407599616 88% /media/tim/TR-004
192.168.1.1:/ubuntu-data 959776768 657463296 253486080 73% /media/tim/ubuntu01-data
192.168.1.11:/home/tim 479593984 21986816 433171968 5% /media/hass-srv
tmpfs 1623280 288 1622992 1% /run/user/1000
$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 1.6G 3.6M 1.6G 1% /run
/dev/nvme0n1p3 469G 18G 432G 4% /
tmpfs 7.8G 103M 7.7G 2% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 7.8G 0 7.8G 0% /run/qemu
/dev/nvme0n1p2 446M 179M 234M 44% /boot
/dev/nvme0n1p1 96M 56M 41M 59% /boot/efi
/dev/sda1 46G 56M 44G 1% /tmp
/dev/sda3 2.6T 1.1T 1.5T 43% /home
/dev/sda2 46G 30G 14G 70% /var
192.168.1.1:/media/TR-004 11T 9.0T 1.4T 88% /media/tim/TR-004
192.168.1.1:/ubuntu-data 916G 628G 242G 73% /media/tim/ubuntu01-data
192.168.1.11:/home/tim 458G 21G 414G 5% /media/hass-srv
tmpfs 1.6G 288K 1.6G 1% /run/user/1000
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