nepomukshow: 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/nepomukshow - from package: nepomuk-core-runtime

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

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