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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).
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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$ date
Thu Mar 2 07:23:38 PM EST 2023
$ TZ=GMT date
Fri Mar 3 12:03:59 AM GMT 2023
$ 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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