iusql: 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/iusql - from package: unixODBC

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

On Debian possible default full paths are:

/usr/bin/iusql - from package: unixODBC

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

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