cleanipcs: 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/lib64/mvapich-psm/bin/cleanipcs - from package: mvapich-psm
/usr/lib64/mvapich/bin/cleanipcs - from package: mvapich
/usr/lib/mvapich/bin/cleanipcs - from package: mvapich

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

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