steghide: 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 Debian possible default full paths are:

/usr/bin/steghide - from package: steghide

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

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