touchcal: 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/touchcal - from package: touchcal

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

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