syncdic: 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/syncdic - from package: Canna

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

On Debian possible default full paths are:

/usr/bin/syncdic - from package: Canna

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

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