vaspview: 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/vaspview - from package: vaspview

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

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