osis2mod: 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/osis2mod - from package: sword

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

On Debian possible default full paths are:

/usr/bin/osis2mod - from package: libsword-utils

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

Error in other languages:
osis2mod: bevel nie gevind nie
osis2mod: comandă negăsită
osis2mod: comando não encontrado
osis2mod: commande introuvable
osis2mod: command not found
osis2mod: käsku ei ole
osis2mod: không tìm thấy lệnh
osis2mod: komanda nerasta
osis2mod: Kommando nicht gefunden.
osis2mod: kommandot finns inte
osis2mod: komut yok
osis2mod: nie znaleziono polecenia
osis2mod: níor aimsíodh an t-ordú
osis2mod: no se encontró la orden
osis2mod: no s'ha trobat l'ordre
osis2mod: opdracht niet gevonden
osis2mod: parancs nem található
osis2mod: perintah tidak ditemukan
osis2mod: príkaz nenájdený
osis2mod: příkaz nenalezen
osis2mod: команда не найдена
osis2mod: командата не е открита
osis2mod: 命令找不到
osis2mod: コマンドが見つかりません