gabedit: 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/gabedit - from package: gabedit

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

On Debian possible default full paths are:

/usr/bin/gabedit - from package: gabedit

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

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