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(Die Seite wurde neu angelegt: Table of Contents * Why learn AWK? * Basic Structure * Executing an AWK script * Which shell to use with AWK? * Dynamic Variables * The Essenti...)
 
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Table of Contents
This awk program deletes C-style comments (‘/* ... */’) [http://www.gnu.org/manual/gawk/html_node/Plain-Getline.html#Plain-Getline Link]<br>


    * Why learn AWK?
negativ from above (prints everything between aAa and bBb)  
    * 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 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


<source lang="bash">#!/usr/bin/awk -f
    {
          if ((t = index($0, "aAa")) != 0) {
                print $0
              # value of `tmp' will be "" if t is 1
              tmp = substr($0, 1, t - 1)
              u = index(substr($0, t + 2), "*/")
              offset = t + 2
              while (u == 0) {
                    if (getline <= 0) {
                        m = "unexpected EOF or error"
                        m = (m ": " ERRNO)
                        print m > "/dev/stderr"
                        exit
                    }
                print $0
                    u = index($0, "bBb")
                    offset = 0
              }
              # substr expression will be "" if */
              # occurred at end of line
              #$0 = tmp substr($0, offset + u + 2)
          }
          #print $0
    }</source>


http://www.grymoire.com/Unix/Awk.html
<br>


[[Kategorie:Linux]]
= Weitere Links<br>  =
 
*[http://www-e.uni-magdeburg.de/urzs/awk/ awk - Eine Einführung]<br>
*[http://www.grymoire.com/Unix/Awk.html Awk - A Tutorial and Introduction]<br>
 
[[Category:Linux]] [[Category:Tips_und_Tricks]]

Aktuelle Version vom 26. August 2009, 19:50 Uhr

This awk program deletes C-style comments (‘/* ... */’) Link

negativ from above (prints everything between aAa and bBb) 

#!/usr/bin/awk -f
     {
          if ((t = index($0, "aAa")) != 0) {
                print $0
               # value of `tmp' will be "" if t is 1
               tmp = substr($0, 1, t - 1)
               u = index(substr($0, t + 2), "*/")
               offset = t + 2
               while (u == 0) {
                    if (getline <= 0) {
                         m = "unexpected EOF or error"
                         m = (m ": " ERRNO)
                         print m > "/dev/stderr"
                         exit
                    }
                print $0
                    u = index($0, "bBb")
                    offset = 0
               }
               # substr expression will be "" if */
               # occurred at end of line
               #$0 = tmp substr($0, offset + u + 2)
          }
          #print $0
     }


Weitere Links

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