gifinfo: 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/gifinfo - from package: giflib-utils

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

On Debian possible default full paths are:

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

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

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