resize_reiserfs: 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:

/sbin/resize_reiserfs - from package: reiserfsprogs

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

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