tei2mod: 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/tei2mod - from package: sword

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

On Debian possible default full paths are:

/usr/bin/tei2mod - from package: libsword-utils

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

Error in other languages:
tei2mod: bevel nie gevind nie
tei2mod: comandă negăsită
tei2mod: comando não encontrado
tei2mod: commande introuvable
tei2mod: command not found
tei2mod: käsku ei ole
tei2mod: không tìm thấy lệnh
tei2mod: komanda nerasta
tei2mod: Kommando nicht gefunden.
tei2mod: kommandot finns inte
tei2mod: komut yok
tei2mod: nie znaleziono polecenia
tei2mod: níor aimsíodh an t-ordú
tei2mod: no se encontró la orden
tei2mod: no s'ha trobat l'ordre
tei2mod: opdracht niet gevonden
tei2mod: parancs nem található
tei2mod: perintah tidak ditemukan
tei2mod: príkaz nenájdený
tei2mod: příkaz nenalezen
tei2mod: команда не найдена
tei2mod: командата не е открита
tei2mod: 命令找不到
tei2mod: コマンドが見つかりません