Echo Command and Quoting in Linux

Echo Command With Examples

The echo command writes character strings to standard output. Strings are separated by spaces, and a new-line character follows the last String parameter specified. If no String parameter is specified, a blank line (new-line character) is displayed.

Example:

Here x is assigned as 52

x=52

and foo is substituted as value of x

foo=$x

Now see what the output of echo is

without quoting

$ echo hello

hello

$ echo $hello

52

$ Echo ${hello}

52

Using double quote

$ echo “$hello”

52

$ echo “${hello}”

52

Using single quote

$ echo '$hello'

$hello

$ echo '${hello}'

${hello}

Let

$ hello= “Hi Wor   l   d”

$ echo $hello

Hi Wor l d

$ echo “$hello”

Hi Wor   l   d

$ echo ‘$hello’

$hello

Variable assignment and substitution