iptc: 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/iptc - from package: libiptcdata

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

On Debian possible default full paths are:

/usr/bin/iptc - from package: libiptcdata-bin

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

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