gifinter: 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/gifinter - from package: giflib-utils

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

On Debian possible default full paths are:

/usr/bin/gifinter - from package: giflib-tools

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

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