gcv: 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/gcv - from package: scotch

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

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