ipcmk: 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/ipcmk - from package: util-linux-ng

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

On Debian possible default full paths are:

/usr/bin/ipcmk - from package: util-linux

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

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