sjislatex: 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/sjislatex - 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/sjislatex - from package: latex-cjk-japanese

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

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