iscsi-inq: 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/iscsi-inq - from package: libiscsi-utils

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

On Debian possible default full paths are:

/usr/bin/iscsi-inq - from package: libiscsi-bin

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

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