shtoolize: command not found

Have You tried accessing the binary with the full path?

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/shtoolize - from package: shtool

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

On Debian possible default full paths are:

/usr/bin/shtoolize - from package: shtool

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