linux - Error with sed option -

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i have created script in script have variable

 ... line 1 ...  ... line 2 ...  num_ligne_pop3_server_name=15  ... line 4 ...

i execute command:

pop3_server_name=$( sed -n '$num_ligne_pop3_server_names/.* = //p' /applis/diapason/$rep_install/conf/mail/$fic_file_manager)

i have error:

sed: -e expression n°1, caractère 8: commande inconnue: `/'

try using double quotes allow variable substitution, , using braces env var name.

pop3_server_name=$( sed -n "${num_ligne_pop3_server_name}s/.* = //p" /applis/diapason/$rep_install/conf/mail/$fic_file_manager)                            ^ ^                          ^          ^

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