.gsissh.hmac: 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/.gsissh.hmac - from package: gsi-openssh-clients

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

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