Summarize the usage of the printf command under Linux

printf--Format and print date formatted output data with printf options

Reference: http://www.computerhope.com/unix/uprintf.htm

Basic English Learning

Binary: Binanry number

Octal: otcal number

Decimal: Decimal number

Hex: Hexadecimal number

1 Basic printout (default non-line break \ n NewLine)

[[email protected] gold]# printf "Hello,world"

Hello,world[[email protected] gold]#

[[email protected] gold] #printf "hello,world\n"

Hello,world

Conversion of 2 binary

%x Hex

%d decimal

%o Octal

Decimal Turn 16 binary

[[email protected] gold]# printf "%x\n" 27

1b

16 Binary to Decimal

[[email protected] gold]# printf "%d\n" 0x1b

27

(Note that the conversion can be made using the BC command, such as 2 binary) ibase input, obase output of the binary)

10 Binary to 2 binary

[Email protected] gold]# echo ' obase=2;10 ' |BC

1010

Handling with variables is commonly used in shell scripts

[Email protected] tmp]# a=10

[Email protected] tmp]# echo "obase=2; $a" |BC

1010

2 Binary Conversion 10 binary

[Email protected] gold]# echo ' ibase=2;111 ' |BC

7

Advanced usage in general:

[email protected] tmp]# cat file.txt 100200300

[[email protected] tmp]# awk ' {print ' ibase=10;obase=2; ' $ ' file.txt |bc |xargs printf '%08d\n ' 011001001100100010010110 0

3 Formatting output alignment (Chinese and English mixed effect is not obvious)

Syntax: %flags width.precision format-specifier

-Is flag left justified by default right justified

12 is width indicates the length of the character occupies extra space, the length of the string is not enough to display.

. precision represents the decimal place of a floating-point number

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Summarize the usage of the printf command under Linux