Useful linux commands and examples.

ls(list)，List files

cricode@ubuntu:~$ ls
Desktop  music  mydocs  python

pwd(print work directory), Show current directory

cricode@ubuntu:~$ pwd
/home/cricode

mkdir, Make directory dir

cricode@ubuntu:~$ mkdir cprogram
cricode@ubuntu:~$ ls
cprogram  Desktop  music  mydocs  python

cd, Switch directory (path)

cricode@ubuntu:~$ cd cprogram/
cricode@ubuntu:~/cprogram$ 

touch, Create file

cricode@ubuntu:~/cprogram$ touch hello.c
cricode@ubuntu:~/cprogram$ ls
hello.c

vim, edit file

cricode@ubuntu:~/cprogram$ vim hello2.c

cat, output

cricode@ubuntu:~/cprogram$ cat hello.c 
# include <stdio.h>
int main()
{
    printf("hello,world!\nwelcome to cricode.com\n");
}

cd -，Go back to last location

Blog git:(master) cd -
~/Github/Blog/images

images git:(master) cd -
~/Github/Blog

cd ..，Go up a directory

images git:(master) cd ..
Blog git:(master) 

rm -r, Delete file and everything under it

cricode@ubuntu:~$ ls
cprogram  Desktop  music  mydocs  python
cricode@ubuntu:~$ rm -r cprogram/
cricode@ubuntu:~$ ls
Desktop  music  mydocs  python

Others：

• ifconfig：Configure the IP address, the default gateway address, and so on

• man：Manual, for example: man ifconfig, you can view the specific usage of the ifconfig command

• find：Find file

• grep：Search for a command that contains a given string or word line, a useful command

• df：View the usage of the disk

• ps ：View the status of the process

• top：View the process of cpu, memory usage

• ping：Check network connectivity

77 Linux commands and utilities you’ll actually use http://searchenterpriselinux.techtarget.com/tutorial/77-useful-Linux-commands-and-utilities