zipgrep: 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/zipgrep - from package: unzip

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

On Debian possible default full paths are:

/usr/bin/zipgrep - from package: unzip

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

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