seaview: 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/seaview - from package: seaview

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

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