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    <p>So, if I rightly understand, you have two pdf files</p> <ul> <li>odd.pdf</li> <li>even.pdf</li> </ul> <p>and you need to INTERLEAVE these pages from these two multipage pdf files: (odd, even, odd... and so on...)</p> <p>I wrote some time ago, for same needs, a script I attach, it is INTERACTIVE, meaning it asks for arguments, if you prefer a NON INTERACTIVE SCRIPT, I can modify it</p> <p>it only needs <strong>PDFTK</strong></p> <pre class="lang-sh prettyprint-override"><code>#!/bin/bash #script able to interleave the pages of two pdf files, saving the result in a new pdf file. Useful for any use, specially to mount parallel text books echo "enter the name (with extension) of first PDF" read filename1 echo "enter the name (with extension) of second PDF" read filename2 pages1="`pdftk $filename1 dump_data output |grep Pages|cut -f2 -d :`" pages2="`pdftk $filename2 dump_data output |grep Pages|cut -f2 -d :`" if [ $pages1 -gt $pages2 ] then pagesincr="$(echo "scale=0; $pages2+1" |bc -l)" echo "$filename1 has $pages1 pages" echo "$filename2 has $pages2 pages" rule="$(for x in $(seq 1 $pages2); do echo -n "A$x B$x "; done; for x in $(seq $pagesincr $pages1); do echo -n "A$x ";done)" echo $rule elif [ $pages2 -gt $pages1 ] then pagesincr="$(echo "scale=0; $pages1+1" |bc -l)" echo "$filename1 has $pages1 pages" echo "$filename2 has $pages2 pages" rule="$(for x in $(seq 1 $pages1); do echo -n "A$x B$x "; done; for x in $(seq $pagesincr $pages2); do echo -n "B$x ";done)" echo $rule else echo "$filename1 has $pages1 pages" echo "$filename2 has $pages2 pages" rule="$(for ((a=1, b=1; a &lt;= $pages1, b &lt;= $pages2 ; a++, b++)); do echo -n "A$a B$b "; done)" echo $rule fi pdftk A=$filename1 B=$filename2 cat $rule output interleaved.pdf echo "file created!" exit 0 </code></pre>
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    1. COTheoretically, that does exactly what I want. However, when I did a test, here is the output I got: `enter the name (with extension) of first PDF odd.pdf enter the name (with extension) of second PDF even.pdf odd.pdf has 5 pages even.pdf has 5 pages A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 A5 Error: Page number: 6 does not exist in file: odd.pdf Errors encountered. No output created. Done. Input errors, so no output created. file created!`
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    2. COI looked at the script more closely, and while not being an expert, I wonder whether the if tests should not rather use -gt than -ge, otherwise the first two cases are not mutually exclusive.
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    3. COon my system, the script works without pains (maybe it is a shell version related) I created a pdf consisting in 10 pages http://ge.tt/33EtMuM/v/0 , then I divided this into two multipage files containing only odd and even pages http://ge.tt/33EtMuM , the result is: 'enter the name (with extension) of first PDF' 'odd.pdf' enter the name (with extension) of second PDF even.pdf odd.pdf has 5 pages even.pdf has 5 pages A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 file created!
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