kalarm: 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/kalarm - from package: kdepim

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

On Debian possible default full paths are:

/usr/bin/kalarm - from package: kalarm

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

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