fts-rest-whoami: 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/fts-rest-whoami - from package: fts-rest-cli

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

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