ubuntu practical guide

The shell doesn't require that the name of the program appear first on the command line

ubuntu@ubuntu:~/test1$ ls

ubuntu@ubuntu:~/test1$ <b cat
ubuntu   tty7         2015-03-15 02:28 (:0)
ubuntu   pts/0        2015-03-15 02:33 (:0)
Sun Mar 22 10:20:41 PDT 2015

ubuntu@ubuntu:~/test1$ >t <b cat

ubuntu@ubuntu:~/test1$ ls

b  t

-----------------------

The shell doesn't look through all directories but only the ones specified by the variable named PATH

-----------------------
ubuntu@ubuntu:~/test1$ cat b
ubuntu   tty7         2015-03-15 02:28 (:0)
ubuntu   pts/0        2015-03-15 02:33 (:0)
Sun Mar 22 10:20:41 PDT 2015
ubuntu@ubuntu:~/test1$ cat b | grep -o ubuntu | tr ubuntu UBUNTU
UBUNTU
UBUNTU
ubuntu@ubuntu:~/test1$ 

----------------------
ubuntu@ubuntu:~/test1$ who | tee who.out | grep ubuntu
ubuntu   tty7         2015-03-15 02:28 (:0)
ubuntu   pts/0        2015-03-15 02:33 (:0)
ubuntu@ubuntu:~/test1$
ubuntu@ubuntu:~/test1$ ls
b  t  who.out

----------------------

fg or  % followed by the number of job you want to bring into the foreground

ubuntu@ubuntu:~/test1$ sleep 10 &

[1] 6321

ubuntu@ubuntu:~/test1$ % 1

sleep 10

ubuntu@ubuntu:~/test1$ sleep 10 &

[1] 6323

ubuntu@ubuntu:~/test1$ fg 1

sleep 10

ubuntu@ubuntu:~/test1$ 

--------------

buntu@ubuntu:~/test1$ sleep 10 &

[1] 6338

ubuntu@ubuntu:~/test1$ kill 6338

ubuntu@ubuntu:~/test1$ jobs

[1]+  Terminated              sleep 10

ubuntu@ubuntu:~/test1$ 

--------------------------

ubuntu@ubuntu:~/test1$ echo *

b t who.out

ubuntu@ubuntu:~/test1$ ls

b  t  who.out

ubuntu@ubuntu:~/test1$ 

--------------------------

*[^a-b] matches any filename that doesn't begin with a, b

ubuntu@ubuntu:~/test1$ ls file*

filea  fileb  filec  filed

ubuntu@ubuntu:~/test1$ ls file*[a-b]

filea  fileb

ubuntu@ubuntu:~/test1$ ls file*[^a-b]

filec  filed

ubuntu@ubuntu:~/test1$