exonpairs: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/exonpairs - from package: snap

You may install the required package with command apt-get install {package}

Error in other languages:
exonpairs: bevel nie gevind nie
exonpairs: comandă negăsită
exonpairs: comando não encontrado
exonpairs: commande introuvable
exonpairs: command not found
exonpairs: käsku ei ole
exonpairs: không tìm thấy lệnh
exonpairs: komanda nerasta
exonpairs: Kommando nicht gefunden.
exonpairs: kommandot finns inte
exonpairs: komut yok
exonpairs: nie znaleziono polecenia
exonpairs: níor aimsíodh an t-ordú
exonpairs: no se encontró la orden
exonpairs: no s'ha trobat l'ordre
exonpairs: opdracht niet gevonden
exonpairs: parancs nem található
exonpairs: perintah tidak ditemukan
exonpairs: príkaz nenájdený
exonpairs: příkaz nenalezen
exonpairs: команда не найдена
exonpairs: командата не е открита
exonpairs: 命令找不到
exonpairs: コマンドが見つかりません