opencc: 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/opencc - from package: opencc

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

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