baobab: 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/baobab - from package: gnome-utils

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

On Debian possible default full paths are:

/usr/bin/baobab - from package: baobab

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

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