tcping: 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/tcping - from package: tcping

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

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