Perl - printf
printf specifier format %flags width key
flags: - left justified
+ insert + sign for positive integer
space insert space for positive integer
# add 0 for octal or 0x for hexadecimal
0 padd number with leading zero
width: m,n
keys: c character
d decimal
e,E scientific
f fixed representation of floating point
g,G if exponent is less than 4, use f, otherwise use E
o octal
s string
x,X hex
page revision: 0, last edited: 11 Apr 2016 00:43