img2google: 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/img2google - from package: GMT

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

On Debian possible default full paths are:

/usr/lib/gmt/bin/img2google - from package: GMT

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

Error in other languages:
img2google: bevel nie gevind nie
img2google: comandă negăsită
img2google: comando não encontrado
img2google: commande introuvable
img2google: command not found
img2google: käsku ei ole
img2google: không tìm thấy lệnh
img2google: komanda nerasta
img2google: Kommando nicht gefunden.
img2google: kommandot finns inte
img2google: komut yok
img2google: nie znaleziono polecenia
img2google: níor aimsíodh an t-ordú
img2google: no se encontró la orden
img2google: no s'ha trobat l'ordre
img2google: opdracht niet gevonden
img2google: parancs nem található
img2google: perintah tidak ditemukan
img2google: príkaz nenájdený
img2google: příkaz nenalezen
img2google: команда не найдена
img2google: командата не е открита
img2google: 命令找不到
img2google: コマンドが見つかりません