$ who
pi@raspberrypi ~ $ who
pi pts/0 2015-09-15 02:46 (192.168.1.13)
Information: List username(s) that logged into rpi.
$ date
pi@raspberrypi ~ $ date
Tue Sep 15 04:59:33 UTC 2015
Information:
$ who am i
pi@raspberrypi ~ $ who am i
pi pts/0 2015-09-15 02:46 (192.168.1.13)
Information:
$ date; who
pi@raspberrypi ~ $ date; who
Tue Sep 15 05:02:55 UTC 2015
pi pts/0 2015-09-15 02:46 (192.168.1.13)
Information:
- date executed first; this is a compound (composed of two or more parts) command.
- dont forget the semi-colon to seperate commands
$ uptime
pi@raspberrypi ~ $ uptime
05:32:33 up 13:49, 1 user, load average: 0.00, 0.01, 0.05
Information:
- Show/tell how long the system has been up. In this example: 5 hours, 32 minutes, 33 seconds.
$ man
Information: command should you use to access the online help for a utility. Commands = utility.
$ ls
Example:
pi@raspberrypi ~ $ ls
add.sh Desktop helloworld python_games test.py
aloha.txt Documents helloworld.c python.py.save test.pyc
array.c helloserver.c learnc Scratch world.sh
$ ls -a
Information: list files and directories include hidden file.
Example:
pi@raspberrypi ~ $ ls -a
. .bashrc .gvfs python_games .vnc
.. .cache helloserver.c python.py.save world.sh
add.sh .config helloworld .scratch .Xauthority
aloha.txt .dbus helloworld.c Scratch .xsession-errors
array.c Desktop .idlerc test.py
.asoundrc Documents learnc test.pyc
.bash_history .fontconfig .local .themes
.bash_logout .gstreamer-0.10 .profile .thumbnails
$ ls -F
pi@raspberrypi ~ $ ls -F
add.sh* Desktop/ helloworld* python_games/ test.py*
aloha.txt Documents/ helloworld.c* python.py.save test.pyc
array.c helloserver.c learnc/ Scratch/ world.sh*
$ ls -1
Information:
Example:
pi@raspberrypi ~ $ ls -1
add.sh
aloha.txt
array.c
Desktop
Documents
helloserver.c
helloworld
helloworld.c
learnc
python_games
python.py.save
Scratch
test.py
test.pyc
world.sh
$ cat
To view the content of a file
Example:
pi@raspberrypi ~ $ cat helloworld.c
#include <stdio.h>
int main()
{
printf("Hello, World!");
return 0;
}
$ cat -n
$ cat -n helloworld.c
To view the content of a file with numbers the output lines
Example:
pi@raspberrypi ~ $ cat -n helloworld.c
1 #include <stdio.h>
2
3 int main()
4 {
5 printf("Hello, World!");
6 return 0;
7 }
$
