gifwedge: 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/gifwedge - from package: giflib-utils

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

On Debian possible default full paths are:

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

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

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