zipmerge: 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/zipmerge - from package: libzip

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

On Debian possible default full paths are:

/usr/bin/zipmerge - from package: zipmerge

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

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