inkscape: 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/inkscape - from package: inkscape

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

On Debian possible default full paths are:

/usr/bin/inkscape - from package: inkscape

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

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