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POBASH: Using cut on space delimited file: Treating two spaces as one
 

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  1. POBASH: Using cut on space delimited file: Treating two spaces as one
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    <p>I need to convert file full of lines like this:</p> <pre><code># 2007 4 29 10 1 17.98 blah other stuff </code></pre> <p>into lines formatted like this</p> <pre><code>2007.04.29.10.01.17 </code></pre> <p>The original line is space delimited, and when a one's place digit number appears (such as 4) it gets listed as ' 4'. When I convert it, I need to be able to change it to '04'. Thus there are spaces that delimit the file, AND spaces that are placeholders for leading zeros.</p> <p>I need to write a shell script to make that conversion. I tried using the cut command because each character stays in the same exact place, so the 7th char is always a delimiting space and the 8th char is always the ten's digit, or a space that should be a leading zero. However I soon discovered that it treats two spaces as one, which totally throws off the count (Since sometimes I have ' 4' and sometimes I will have '14'.</p> <p>So: I need a way to read and convert this file, either using cut, or some other method (awk?) that will allow me to do this. Either a way to modify my current code (below) or another approach that would work a lot better would be much appreciated.</p> <p>Just for reference, my present code is below:</p> <pre><code>while read LINE do #IF line starts with '#', then if [[ $LINE == "#"* ]]; then #123456789012345678901 # 2008 12 26 11 26 20.36 # 2007 5 10 1 8 10.52 #GET 4 digit year LINEyear=$(echo $LINE | cut -c3-6) #GET 2 digit month if [ $(echo $LINE | cut -c8-8) == " " ]; then LINEmonth=0$(echo $LINE | cut -c8-9) else LINEmonth=$(echo $LINE | cut -c8-9) fi #GET 2 digit day if [ $(echo $LINE | cut -c11-11) == " " ]; then LINEday=0$(echo $LINE | cut -c11-12) else LINEday=$(echo $LINE | cut -c11-12) fi #GET hour, min, sec, (Removed to save space) LINEnew=$LINEyear.$LINEmonth.$LINEday.$LINEhour.$LINEmin.$LINEsec echo $LINEnew fi done </code></pre>
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    1. USBrian C
    1. USBrian C
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    1. COMost times you find yourself writing a loop in shell, you are using the wrong tool. There are exceptions of course, but they involve process or file manipulation (create/destroy) not text manipulation.
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      1. POBASH: Using cut on space delimited file: Treating two spaces as one
      1. USEd Morton
 

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