Published Book on Amazon
|All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1|
|All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2|
출판된 한글판 도서
|최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)|
|최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)|
Original Book Contents
10.7 Commands Related to Program Execution
The "which" command tells you what program is actually being used when executing certain command on the system. In fact, many programs are installed in many places in the system, so it is often difficult to judge which program is actually used. The "which" command is used in this case.
■ It tells the location of the program to be actually executed for the command executed on the system.
■ User privilege -- Normal user.
print all matching pathnames of each argument
First, let's look at the program used for the "mkdir" command.
pi@raspberrypi ~/testdata $ which mkdir
This result means that running the "mkdir" command on your system will use the program in "/bin/mkdir".
Now, let's check if the program is in that location. If you run the following command with the "ls" command, you can see that the "mkdir" file exists in the specified directory.
pi@raspberrypi ~/testdata $ ls /bin/mkdir -l
-rwxr-xr-x 1 root root 38596 Jan 28 2013 /bin/mkdir
Here is to check the file path for "vncserver" program.
pi@raspberrypi ~/testdata $ which vncserver
pi@raspberrypi ~/testdata $