dasdconv: 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/dasdconv - from package: hercules

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

On Debian possible default full paths are:

/usr/bin/dasdconv - from package: hercules

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

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