sjisconv: 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/sjisconv - from package: texlive-east-asian

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

On Debian possible default full paths are:

/usr/bin/sjisconv - from package: latex-cjk-japanese

You may install the required package with command apt-get install {package}

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