sinjdoc: 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/sinjdoc - from package: sinjdoc

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

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