ling508-26$ cd tmp
tmp$ ls
f1.jpg		f2.jpg		f3.jpg		f4.jpg		f5.jpg
f1.jpg.bak	f2.jpg.bak	f3.jpg.bak	f4.jpg.bak	f5.jpg.bak
tmp$ rm *
tmp$ nano file1
tmp$ ls
file1
tmp$ ls -l
total 8
-rw-r--r--  1 sandiway  staff  41 Sep 10 14:05 file1
tmp$ cat file1 
This is file #1
One
Two
Three
Four
Five

tmp$ nano file2
tmp$ ls
file1	file2
tmp$ nano file3
tmp$ ls
file1	file2	file3
tmp$ nano file1
tmp$ cat file1
This is file #1
One
Two
Three
Four
Five
Six
Seven
Eight
Nine
Ten
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

tmp$ cat file1 | more
This is file #1
One
Two
Three
Four
Five
Six
Seven
Eight
Nine
Ten
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

tmp$ cat file1 > file4
tmp$ ls
file1	file2	file3	file4
tmp$ ls -l
total 32
-rw-r--r--  1 sandiway  staff  117 Sep 10 14:10 file1
-rw-r--r--  1 sandiway  staff   50 Sep 10 14:06 file2
-rw-r--r--  1 sandiway  staff   26 Sep 10 14:06 file3
-rw-r--r--  1 sandiway  staff  117 Sep 10 14:14 file4
tmp$ less file4
tmp$ cat file2 > file4
tmp$ ls -l
total 32
-rw-r--r--  1 sandiway  staff  117 Sep 10 14:10 file1
-rw-r--r--  1 sandiway  staff   50 Sep 10 14:06 file2
-rw-r--r--  1 sandiway  staff   26 Sep 10 14:06 file3
-rw-r--r--  1 sandiway  staff   50 Sep 10 14:15 file4
tmp$ cat > file4
I am happily typing away here at the terminal
How do I stop this?
tmp$ ls -l
total 32
-rw-r--r--  1 sandiway  staff  117 Sep 10 14:10 file1
-rw-r--r--  1 sandiway  staff   50 Sep 10 14:06 file2
-rw-r--r--  1 sandiway  staff   26 Sep 10 14:06 file3
-rw-r--r--  1 sandiway  staff   66 Sep 10 14:18 file4
tmp$ less file4
tmp$ cat
Hi
Hi
Bye
Bye
tmp$ less file4
tmp$ cat file1 >> file4
tmp$ ls -l
total 32
-rw-r--r--  1 sandiway  staff  117 Sep 10 14:10 file1
-rw-r--r--  1 sandiway  staff   50 Sep 10 14:06 file2
-rw-r--r--  1 sandiway  staff   26 Sep 10 14:06 file3
-rw-r--r--  1 sandiway  staff  183 Sep 10 14:23 file4
tmp$ less file4
tmp$ cat file1 file2 file3
This is file #1
One
Two
Three
Four
Five
Six
Seven
Eight
Nine
Ten
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

This is file #2.
Not
sure
what 
to
put 
in 
here

This is file #3.
No idea

tmp$ cat file[1-3] 
This is file #1
One
Two
Three
Four
Five
Six
Seven
Eight
Nine
Ten
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

This is file #2.
Not
sure
what 
to
put 
in 
here

This is file #3.
No idea

tmp$ cat file[1-3] | sort > file4
tmp$ nano file4
tmp$ echo file1
file1
tmp$ echo < file1

tmp$ nano script.sh
tmp$ more script.sh 
#!/bin/bash
read -p  "Enter 1st number: " x;
read -p "Enter 2nd number: " y;
((z = x + y));
((w = x * y));
echo "$x + $y = $z";
echo "$x * $y = $w";


tmp$ script.sh
-bash: script.sh: command not found
tmp$ ./script.sh
-bash: ./script.sh: Permission denied
tmp$ ls -l script.sh
-rw-r--r--  1 sandiway  staff  151 Sep 10 14:43 script.sh
tmp$ chmod u+x script.sh 
tmp$ ls -l script.sh
-rwxr--r--  1 sandiway  staff  151 Sep 10 14:43 script.sh
tmp$ ./script.sh
Enter 1st number: 34
Enter 2nd number: 17
34 + 17 = 51
34 * 17 = 578
tmp$ more script.sh 
#!/bin/bash
read -p  "Enter 1st number: " x;
read -p "Enter 2nd number: " y;
((z = x + y));
((w = x * y));
echo "$x + $y = $z";
echo "$x * $y = $w";


tmp$