fslsfonts: 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 Debian possible default full paths are:

/usr/bin/fslsfonts - from package: x11-xfs-utils

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

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