awk merge lines

原创于 2016-10-17 22:52:10 发布 · 539 阅读

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本文介绍了一个使用awk脚本来合并带有续行标记(-)的连续文本行的方法。通过具体的例子展示了如何处理文本文件中带有续行标识的情况，并提供了一个完整的awk脚本实现。

A sample to merge continuous text line using awk utility.

i.e, when a text line is ended with a dash ('-'), it should continue with next line.

For example:

should be merged to:

 1:  11
 2:  22 33
 3:  44

The awk script:

#!/bin/ksh

INPUT=${1}

awk '
    function ltrim(s) { sub(/^[ \t\r\n]+/, "", s); return s }
    function rtrim(s) { sub(/[ \t\r\n]+$/, "", s); return s }
    function trim(s)  { return rtrim(ltrim(s)); }

    BEGIN {}
    {
      # If the last char is a dash, continue
      if (substr($0, length($0), 1) == "-") {
        printf "%s ", rtrim(substr($0, 0, length($0) - 1))
      }
      else {
        printf "%s\n", ltrim($0)
      }
    }
    END {}
' $INPUT

The End.