Highlight: 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/Highlight - from package: highlighting-kate
/usr/bin/Highlight - from package: highlight

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

On Debian possible default full paths are:

/usr/bin/Highlight - from package: highlight

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

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