Shell Script (iii)

Excerpt from: Rookie Tutorial http://www.runoob.com/linux/linux-shell-echo.html

Shell command

1. Echo command

String output

echo "ok! \c "

echo "It is a test"

Output: ok! It is a test

2. printf command

Formatted output

%d%s%f

Escape sequence:

\a: Warning Character

\b: Back

\c: Suppresses (does not display) the newline character at any end of the output (only valid in the parameter string under the%B format designator control), and any characters left in the argument, any subsequent arguments, and any characters left in the format string are ignored

\f: Page Change

\ n: Line break

\ r: Enter

\ t: Horizontal tab

\v: Vertical tab

\ \: Backslash character

\ddd:1 to 3-bit octal value character, valid only in format string

\0DDD: An octal value character that represents 1 to 3

3. Test command

Check if a condition is true and you can test arrays, characters, and files

Such as:

NUM1=

num2=

If test $[num1] -eq $[num2]

< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" >then

< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" > echo ' two numbers equal! '

< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" >else

< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" > echo ' two numbers are not equal! '

< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" >fi

< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" >< Span class= "PLN" > output: two numbers equal!

For specific parameters see: http://www.runoob.com/linux/linux-shell-test.html

Shell Script (iii)