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POremove single elements in a text file in bash
 

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  1. POremove single elements in a text file in bash
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    <p>Basically what I have is a text file (file.txt), which contains lines of numbers (lines aren't necessarily the same length) e.g.</p> <p><br>1 2 3 4 <br>5 6 7 8 <br>9 10 11 12 13</p> <p>What I need to do is write new files with each of these numbers deleted, one at a time, with replacement e.g. the first new file will contain</p> <p><br>2 3 4 &lt;--- 1st element removed <br>5 6 7 8 <br>9 10 11 12 13</p> <p>and the 7th file will contain</p> <p><br> 1 2 3 4 <br> 5 6 8 &lt;--- 7th element removed here <br> 9 10 11 12 13</p> <p>To generate these, I'm looping through each line, and then each element in each line. E.g. for the 7th file, where I remove the third element of the second line, I'm trying to do this by reading in the line, removing the appropriate element, then reinserting this new line</p> <p><br>$lineNo is 2 (second line) <br>$line is 5 6 7 8 <br>with cut, I remove the third number, making $newline 5 6 8</p> <p>Then I try to replace the line $lineNo in file.txt with $newline using sed: <br>sed -n '$lineNo s/.*/'$newline'/' > file.txt</p> <p>This is totally not working. I get an error <br>sed: can't read 25.780000: No such file or directory<br> <br>(where 25.780000 is a number in my text file. It looks like it's trying to use $newline to read files or something) <br>I have reason to suspect my way of stating which line to replace isn't working either :(</p> <p>My question is, a) is there a better way to do this rather than sed, and b) if sed is the way to go, what am I doing wrong?</p> <p>Thanks!! </p>
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    1. CODo all the lines have the same number of fields? Is this number known in advance?
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      1. USglenn jackman
    2. COnope :( they might have different lengths
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      1. USmirri66
    3. COSo if the file contained only contained the line `1 2 3 4 5 6 7 8 9 10 11` you would want to create 10 new files, is that correct?
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      1. POremove single elements in a text file in bash
      1. USAndrew Clark
 

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