palindrome: 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/palindrome - from package: emboss

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

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