kabcclient: 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/kabcclient - from package: kdepim

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

On Debian possible default full paths are:

/usr/bin/kabcclient - from package: kaddressbook

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

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