lessecho: 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/lessecho - from package: less

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

On Debian possible default full paths are:

/usr/bin/lessecho - from package: less
/bin/lessecho - from package: less

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

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