gucharmap: 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/gucharmap - from package: gucharmap

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

On Debian possible default full paths are:

/usr/bin/gucharmap - from package: gucharmap

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

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