gsymcheck: 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/gsymcheck - from package: geda-gsymcheck

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

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