文件名称：Awk入门教程 《Awk A Tutorial and Introduction - by Bruce Barnett》
文件大小：124KB
文件格式：HTM
更新时间：2014-11-04 09:15:36
awk 教程 tutorial
Awk入门教程。作者 Bruce Barnett 注：英文版。以下是目录 Why learn AWK? Basic Structure Executing an AWK script Which shell to use with AWK? Dynamic Variables The Essential Syntax of AWK Arithmetic Expressions Unary arithmetic operators The Autoincrement and Autodecrement Operators Assignment Operators Conditional expressions Regular Expressions And/Or/Not Commands AWK Built-in Variables FS - The Input Field Separator Variable OFS - The Output Field Separator Variable NF - The Number of Fields Variable NR - The Number of Records Variable RS - The Record Separator Variable ORS - The Output Record Separator Variable FILENAME - The Current Filename Variable Associative Arrays Multi-dimensional Arrays Example of using AWK's Associative Arrays Output of the script Picture Perfect PRINTF Output PRINTF - formatting output Escape Sequences Format Specifiers Width - specifying minimum field size Left Justification The Field Precision Value Explicit File output AWK Numerical Functions Trigonometric Functions Exponents, logs and square roots Truncating Integers "Random Numbers The Lotto script String Functions The Length function The Index Function The Substr function GAWK's Tolower and Toupper function The Split function NAWK's string functions The Match function The System function The Getline function The systime function The Strftime function User Defined Functions AWK patterns Formatting AWK programs Environment Variables ARGC - Number or arguments (NAWK/GAWK) ARGV - Array of arguments (NAWK/GAWK) ARGIND - Argument Index (GAWK only) FNR (NAWK/GAWK) OFMT (NAWK/GAWK) RSTART, RLENGTH and match (NAWK/GAWK) SUBSEP - Multi-dimensional array separator (NAWK/GAWK) ENVIRON - environment variables (GAWK only) IGNORECASE (GAWK only) CONVFMT - conversion format (GAWK only) ERRNO - system errors (GAWK only) FIELDWIDTHS - fixed width fields (GAWK only) AWK, NAWK, GAWK, or PERL