cmodeltoseq: 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 CentOS possible default full paths are:

/usr/bin/cmodeltoseq - from package: clipper

You may install the required package with command yum install {package}

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