porestructure: 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/porestructure - from package: translate-toolkit

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

On Debian possible default full paths are:

/usr/bin/porestructure - from package: translate-toolkit

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

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