qalter-ge: 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/qalter-ge - from package: gridengine

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

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