otags: 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 Debian possible default full paths are:

/usr/bin/otags - from package: otags

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

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