echo command one linsers

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Input a line of text and display on standard output

# echo Test string for command exercises

Test string for command exercises

Print value of a variable

# var1=10

# echo The value of variable var1 = $var1

The value of variable x = 10

Note: The ‘-e’ option in Linux acts as interpretation of escaped characters that are backslashed.

‘\b’– Backspace which removes all the spaces in between.

With backslash interpreter (-e)

# echo -e "Test string \bfor command \bexercises "

Test stringfor commandexercises

Without backslash interpreter (-e)

# echo "Test string \bfor command \bexercises "

Test string \bfor command \bexercises

‘\n’ – New line to add new line from where it is used.

With backslash interpreter (-e)

# echo -e "Test string \nfor command \nexercises "

Test string

for command

exercises

Without backslash interpreter (-e)

# echo "Test string \nfor command \nexercises "

Test string \nfor command \nexercises

‘\t’ – Horizontal tab to have horizontal tab spaces.

With backslash interpreter (-e)

# echo -e "Test string \tfor command \texercises "

Test string     for command     exercises

Without backslash interpreter (-e)

# echo "Test string \tfor command \texercises "

Test string \tfor command \texercises

Using new Line ‘\n‘ and horizontal tab ‘\t‘ simultaneously.

With backslash interpreter (-e)

# echo -e "Test string \n\tfor command \n\texercises "

Test string

        for command

        exercises

Without backslash interpreter (-e)

# echo "Test string \n\tfor command \n\texercises "

Test string \n\tfor command \n\texercises

With backslash interpreter (-e) Sequence matters

# echo -e "Test string \t\nfor command \t\nexercises "

Test string

for command

exercises

With backslash interpreter (-e)

# echo  "Test string \t\nfor command \t\nexercises "

Test string \t\nfor command \t\nexercises

‘\v’ – Vertical tab to have vertical tab spaces.

With backslash interpreter (-e)

# echo -e "Test string \vfor command \vexercises "

Test string

            for command

                        exercises

Without backslash interpreter (-e)

# echo "Test string \vfor command \vexercises "

Test string \vfor command \vexercises

Using new Line ‘\n’ and vertical tab ‘\v’ simultaneously.

With backslash interpreter (-e)

# echo -e "Test string \n\vfor command \n\vexercises "

Test string

for command

exercises

Without backslash interpreter (-e)

# echo "Test string \n\vfor command \n\vexercises "

Test string \n\vfor command \n\vexercises

With backslash interpreter (-e)

# echo -e "Test string \v\nfor command \v\nexercises "

Test string

for command

exercises

Without backslash interpreter (-e)

# echo "Test string \v\nfor command \v\nexercises "

Test string \v\nfor command \v\nexercises

Note: no difference observed in combinational use of new line and vertical tab option, multiple time usage can get you different results.

‘\r’ – carriage return to have specified carriage return in output.

With backslash interpreter (-e)

# echo -e "Test string \rfor command exercises "

for command exercises

Without backslash interpreter (-e)

# echo "Test string \rfor command exercises "

Test string \rfor command exercises

‘\c’ – suppress trailing new line to continue without emitting new line.

Without backslash interpreter (-e)

# echo -e "Test string \cfor command exercises "

Test string [test ~]#

Without backslash interpreter (-e)

# echo "Test string \cfor command exercises "

Test string \cfor command exercises

Omit printing trailing new line using option ‘-n‘.

# echo -n "Test string for command exercises "

Test string for command exercises [test ~]#

‘\a’ – alert return to have sound alert.

With backslash interpreter (-e)

# echo -e "Test string \afor command exercises "

Test string for command exercises

Note: Make sure to check Volume key, before firing.

Without backslash interpreter (-e)

# echo "Test string \afor command exercises "

Test string \afor command exercises

Print all the files/folder using echo command (simulate ls command).

# echo *

Print files of a specific kind.

# echo *.txt

To append a text to a file instead of sending it to standard output

# echo "Test content" > testfile

# cat testfile

Test content

Prints " (quote, octal ASCII character 42)

echo "QUOTATION MARK"

echo -e "\042"       # Prints " (quote, octal ASCII character 42).

echo "=============="

Quote (") framed by tabs.

echo $'\t \042 \t'  # Using ASCII Values

echo $'\t \x22 \t'  # Using Hexadecimal Values

Assigning ASCII characters to a variable.

quote=$'\042'        # " assigned to a variable.

echo "$quote Quoted string $quote and this lies outside the quotes."

Concatenating ASCII chars in a variable.

triple_underline=$'\137\137\137'  # 137 is octal ASCII code for '_'.

echo "$triple_underline UNDERLINE $triple_underline"

Assigning Octal character values to a variable.

ABC=$'\101\102\103\010'           # 101, 102, 103 are octal A, B, C.

echo $ABC

Reference:-

http://www.asciitable.com/

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