Writing Output

You can output text to the terminal window using echo

$ echo Please wait...

Please wait...

$

without quotes, whitespace is lost

$ echo this     was     very    widely     spaced

this was very widely spaced

$

using quotes will preserve spacing

$ echo "this     was     very    widely     spaced"

this     was     very    widely     spaced

$

OR

$ echo 'this     was     very    widely     spaced'

this     was     very    widely     spaced

$

By using single quotes, the shell is told explicity not to interfere with the string at all. If you use double quotes, some shell substitutions will take place (variable and tilde expansions and command substitutions), but since there are none in this example, the shell has nothing to change. When in doubt, use the single quotes.

Writing Output To File

$ echo this is an example

this is an example

$ echo this is an example > file.txt

$

$ cat file.txt

this is an example

$

Saving Output from the ls Command

$ ls

a.out     cong.txt    def.conf   file.txt    more.txt

$

But when we save the output using >, we get this:

$ ls > /tmp/save.out

$ cat /tmp/save.out

a.out

cong.txt

def.conf

file.txt

more.txt

$

We could have the original style of output using the -C option

$ ls -C > /tmp/save.out

$ cat /tmp/save.out

a.out  cong.txt  def.conf  file.txt  more.txt

$

Alternatively, you could use the -1 (negative one) option on ls when we don't redirect to file then we get output like this:

$ ls -1

a.out

cong.txt

def.conf

file.txt

more.txt

save.out

$

For more information on ls, read the manual by typing: man ls

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