imp2gbs: 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/imp2gbs - from package: sword

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

On Debian possible default full paths are:

/usr/bin/imp2gbs - from package: libsword-utils

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

Error in other languages:
imp2gbs: bevel nie gevind nie
imp2gbs: comandă negăsită
imp2gbs: comando não encontrado
imp2gbs: commande introuvable
imp2gbs: command not found
imp2gbs: käsku ei ole
imp2gbs: không tìm thấy lệnh
imp2gbs: komanda nerasta
imp2gbs: Kommando nicht gefunden.
imp2gbs: kommandot finns inte
imp2gbs: komut yok
imp2gbs: nie znaleziono polecenia
imp2gbs: níor aimsíodh an t-ordú
imp2gbs: no se encontró la orden
imp2gbs: no s'ha trobat l'ordre
imp2gbs: opdracht niet gevonden
imp2gbs: parancs nem található
imp2gbs: perintah tidak ditemukan
imp2gbs: príkaz nenájdený
imp2gbs: příkaz nenalezen
imp2gbs: команда не найдена
imp2gbs: командата не е открита
imp2gbs: 命令找不到
imp2gbs: コマンドが見つかりません