Add text when i replace string with sed command

Question

i did a script that retrieve content of a source file so i can create a target file the way i want it.

I do a "sed" command so i can change the word "Numérique" with "PIC S".

Source File .txt :

MotifRad;CHAR(2);Motif de radiation
MtPrime;Numérique 8.2;Montant prime d'origine

Target File .txt :

* Motif de radiation
05 MotifRad PIC X(2).
* Montant prime d'origine
05 MtPrime PIC S 8.2.

As you can see i did change the word "Numérique" but i'd like to add the number that follows in parentheses like that : PIC S (8.2), how could i do that ?

Bash script :

#!/bin/bash

#Fichier Source
fichier="APGFPOLI.des.txt"

champAdd="05 "

if [[ -f "$fichier" ]]
then
    
    # read it
    sed 1d $fichier| sed -i 's/CHAR/PIC X/' $fichier | sed -i 's/Numérique/PIC S/' $fichier | while IFS=';' read -r nomChamp format libelle
    do
        echo \* $libelle
        echo $champAdd $nomChamp $format.
    done <"$fichier" > test.txt
fi

Answer 1

$ sed 's/;Numérique[[:space:]]\+\([^;]*\)/;PIC S(\1)/' <<< "MtPrime;Numérique 8.2;Montant prime d'origine"
MtPrime;PIC S(8.2);Montant prime d'origine

Or, with GNU sed:

$ sed -E 's/;Numérique\s+([^;]*)/;PIC S(\1)/' <<< "MtPrime;Numérique 8.2;Montant prime d'origine"
MtPrime;PIC S(8.2);Montant prime d'origine

Applied to your file:

$ sed -E '/Numérique/s/;Numérique\s+([^;]*)/;PIC S(\1)/' file.txt
MotifRad;CHAR(2);Motif de radiation
MtPrime;PIC S(8.2);Montant prime d'origine

If you want to replace CHAR and Numérique in the same run:

$ sed -E '/CHAR/s/;CHAR(\([[:digit:]]+\));/;PIC X\1/
          /Numérique/s/;Numérique\s+([^;]*)/;PIC S(\1)/' file.txt
MotifRad;PIC X(2);Motif de radiation
MtPrime;PIC S(8.2);Montant prime d'origine

Answer 2

I am only answering the portion regarding the replacement of Numérique [a floating point number] with PIC S [that same floating point number].

Use a capturing group to capture the floating point and a back reference to add it back to the replacement:

cat file
MotifRad;CHAR(2);Motif de radiation
MtPrime;Numérique 8.2;Montant prime d'origine

sed -E 's/Numérique([[:blank:]]+[[:digit:].]+)/PIC S\1/' file
MotifRad;CHAR(2);Motif de radiation
MtPrime;PIC S 8.2;Montant prime d'origine

If you want parenthesis around the replacement:

sed -E 's/Numérique([[:blank:]]+)([[:digit:].]+)/PIC S\1(\2)/' file
MotifRad;CHAR(2);Motif de radiation
MtPrime;PIC S (8.2);Montant prime d'origine

Capturing groups are defined with ([thing to capture]) and the reference to that captured item is \1, \2, \n with the left most opening parenthesis being the lowest number and so on.

Example:

echo 'this;that' | sed -E 's/(.*);(.*)/\2 \1/'
that this