Concaténer en shell

[tmpfs]$ cat data.txt
antony;034;
antony sud;034;
paris;075;
antony;034;
massy;091;
savigny;034;

[tmpfs]$ cat le_script.sh
#! /bin/bash

sort -u data.txt | sort -n -t";" +1  > fich
var=$(sort -u data.txt | sort -n -t";" +1 -u | cut -d";" -f2)

while read line; do sed -i '
/'"${line}"';$/{
:z
N
/'"${line}"';$/{
s/\n//
tz
}
s/;'"${line}"';\b/ \/ /g
}
' fich; done <<<"$var"

[tmpfs]$ ./le_script.sh
[tmpfs]$ cat fich
antony / antony sud / savigny;034;
paris;075;
massy;091;

[tmpfs]$

root@osiris ~/src/bash
$ cat data.txt
antony;034;
antony sud;034;
paris;075;
antony;034;
massy;091;
savigny;034;

root@osiris ~/src/bash
$ cat villes.sh
#!/bin/bash
sort  data.txt | uniq | awk 'BEGIN{FS=";"}
{gsub("^0", "" ,$2);
 numdep = $2 ;
 res[numdep] = res[numdep] "/" $1;
 }
 END {for (i=33; i<91; i++) {printf( "%03d %s\n",  i, res[i]);} } '