ksig: command not found

Have You tried accessing the binary with the full path?

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/ksig - from package: ksig

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