如果行的长度小于固定长度，则将0附加到Unix/bash文件中 [英] Appending 0's to a file in unix/bash if the line is less than a fixed length

问题描述

我正在寻找一种方法，如果文件长度少于66个字符，则在文件的多行末尾添加0，以使总行长等于66.

I am looking for a way in which to append 0's to the end of multiple lines in a file if they are less than 66 characters in length so that the total line length equals 66.

这是文件格式的示例(...表示前56个字符):

Here's an example of the file format (... denotes preceding 56 characters):

$cat file1
...1234567891
...123456
...
...12345678

理想格式:

...1234567891
...1234560000
...0000000000
...1234567800

推荐答案

GNU awk 解决方案:

$ awk '{s=$0; while(length(s)<66) s=s "0"; print s}' file1

或更短:

$ awk '{while(length<66) $0=$0 "0"}1' file1

具有提供的输入:

$ awk '{while(length<66) $0=$0 "0"}1' file1
...123456789100000000000000000000000000000000000000000000000000000
...123456000000000000000000000000000000000000000000000000000000000
...000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000
...123456780000000000000000000000000000000000000000000000000000000

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