pscap: 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/pscap - from package: libcap-ng-utils

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

On Debian possible default full paths are:

/usr/bin/pscap - from package: libcap-ng-utils

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

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