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Suppose, I have a directory called Titlepage that have many files named titlepage_1.pdf, titlepage_2.pdf ... titlepage_n.pdf and their tex files also. I have a bash function that alter two filenames.(e.g. $alterpdf 2 3 this command swap filename titlepage_2.pdf to titlepage_3.pdf. And does same thing for the corresponding tex files also.) 

function swap(){ mv $1 $1._tmp && mv $2 $1 && mv $1._tmp $2; }
function alterpdf(){ swap titlepage_$1.pdf titlepage_$2.pdf; swap titlepage_$1.tex titlepage_$2.tex; }

Now, I want a function(e.g, filepush new.pdf 2 3) that can insert new.pdf inside titlepage_2.pdf and titlepage_3.pdf with the name titlepage_3.pdf. And next files's number is increased. titlepage_3.pdf to titlepage_4.pdf titlepage_4.pdf to titlepage_5.pdf and so on.

There also a .tex file for all pdf in that directory.

Edit
I want to implement follows- 

Titlepage$ ls
titlepage_1.tex titlepage_1.pdf titlepage_2.tex titlepage_2.pdf titlepage_3.tex titlepage_3.pdf
Titlepage$ vim new.tex
Titlepage$ pdflatex new.tex
Titlepage$ ls
new.pdf new.tex titlepage_1.tex titlepage_1.pdf titlepage_2.tex titlepage_2.pdf titlepage_3.tex 
titlepage_3.pdf
Titlepage$ push new.pdf 2 3
Titlepage$ ls
titlepage_1.tex titlepage_1.pdf titlepage_2.tex titlepage_2.pdf titlepage_3.tex titlepage_3.pdf titlepage_4.tex titlepage_4.pdf

Edit
proposed solution 

$ls *.pdf|grep -Eo [0-9]+|sort -n

This results the index of the files. Starting from tail increment each index adding 1 for each file up to the insertion point(2nd argument of push). Then rename the target file(new.pdf) to titlepage_3rd_argement_of_push.pdf

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  • 1
    What is the relevance of the .tex files? They're not mentioned in the renames to that point. Do they need to be renamed? Commented Mar 21, 2018 at 16:45
  • @JeffSchaller yes. I edited my question again. Commented Mar 21, 2018 at 16:58

2 Answers 2

Reset to default
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OK, here's a script that does something like what you want.

#!/bin/bash

NEWFILES=${1}
INSERT_IDX=${2}
PREFIX="titlepage_"

# just in case
prefixnum=${filebase//[^0-9]/}
case $prefixnum in
  (*[![:blank:]]*) echo "invalid prefix, contains numbers"; exit 1;;
esac

# check input arguments
if [ ! $# -eq 2 ];
then
  echo "USAGE: insert.sh <newfiles> <insertion_index>"
  echo 'example: insert.sh "new.pdf new.tex" 2'
  exit 1
fi

## process infiles
for infile in ${NEWFILES}
do
  ext=${infile##*.}
  for file in $(ls -1 ${PREFIX}[0-9]*.${ext} | sort -rV)
  do

      filebase=${file%.*}
      number=${filebase//[^0-9]/}
      numberless=${filebase//[0-9]/}

      if [ "${numberless}${number}.${ext}" != "${file}" ];
      then
        echo "invalid file ${file}"
        echo "${numberless}${number}.${ext}" "${file}"
        exit 1
      fi

      if [ ${number} -ge ${INSERT_IDX} ]
      then
          echo "$file" "${numberless}$((${number} + 1))".$ext
          mv "$file" "${numberless}$((${number} + 1))".$ext
      else
        echo ${file}
      fi
  done
  echo "${infile}"  "${PREFIX}${INSERT_IDX}.${ext}"
  mv "${infile}"  "${PREFIX}${INSERT_IDX}.${ext}"
done
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6
  • 1
    Check your script urgently. There is a great mistake, but easy to solve. $./insert.sh "delete.pdf delete.tex" 2 \\ \titlepage_1.pdf\\ titlepage_2.pdf titlepage_3.pdf titlepage_3.pdf titlepage_4.pdf\\ titlepage_4.pdf titlepage_5.pdf\\ delete.pdf titlepage_2.pdf \\titlepage_1.tex titlepage_2.tex titlepage_3.tex titlepage_3.tex titlepage_4.tex titlepage_4.tex titlepage_5.tex Commented Mar 23, 2018 at 16:15
  • That means finally only titlepage_5.tex and titlepage_5.pdf and befor index 3. Commented Mar 23, 2018 at 16:18
  • That was a bad bug, thanks for catching it. I reversed the sort order, which should get rid of that problem. Commented Mar 23, 2018 at 20:51
  • Yes, now it works. The script is large enough. If you can minimize the script size it is helpful to other to understand what you want to do easily. Commented Mar 24, 2018 at 0:13
  • I don't fell the necessity of first if(...........invalid file.......) block inside the for loop. I guess if [ "${numberless}${number}.${ext}" != "${file}" ]; is false all time. Commented Mar 24, 2018 at 0:23
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that can insert new.pdf inside titlepage_2.pdf and titlepage_3.pdf

So to clarify, you want to be able to sandwich new.pdf between to the two titlepage files, and produce a new file, titlepage_3.pdf, and move the original titlepage_3.pdf to a titlepage_4.pdf, and increment the number of the remaining pdf files with similar names?

In other words, we want to be left with a new list, where the new titlepage_3.pdf now contains the pages in titlepage_2.pdf, then the pages in new.pdf, then the pages in titlepage_3.pdf? There are several ways to concatenate pdfs you could use for this. For incrementing the numbers, I would recommend doing that before the concatenation step, using perl-style regex and the rename command.

For the .tex files, I'm not sure what exactly you're trying to accomplish, but this link might have useful information on how to concatenate tex files.

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3
  • You don't understand my question. I don't say inserting new.pdf in a pdf file. I want to insert this inside the filesystem. Commented Mar 22, 2018 at 0:09
  • I edited my question again. See that. Commented Mar 22, 2018 at 0:18
  • You can delete this, as you posted a solution. Commented Mar 24, 2018 at 0:14

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